Cover [Abstract] Document Type Amendment Flag Document Fiscal Year Focus Document Period End Date Document Fiscal Period Focus Document Transition Report Current Fiscal Year End Date Entity File Number Entity Registrant Name Entity Central Index Key Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Entity Small Business Entity Emerging Growth Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province No Trading Symbol Flag Entity Current Reporting Status Entity Interactive Data Current Document Quarterly Report Entity Filer Category Operations Statement [Abstract] Revenue from Contract with Customer, Excluding Assessed Tax Revenues Operating Expenses Operating expenses Other Nonoperating Income (Expense) Other (income)/deductions—net Other (income)/deductions—net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Loss before benefit for taxes on income Income Tax Expense (Benefit) Benefit for taxes on income Income tax expense benefit Net Income (Loss) Attributable to Parent Net loss Net loss Net loss Earnings Per Share, Basic and Diluted Loss per common share—basic and diluted(a) Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted-average common shares—basic and diluted(a) Statement of Comprehensive Income [Abstract] Statement [Table] Class of Stock [Axis] Class of Stock [Domain] Statement [Line Items] Statement [Line Items] Other Comprehensive Income (Loss), before Tax Other comprehensive income/(loss) before tax Other Comprehensive Income (Loss), Tax Tax provision/(benefit) on other comprehensive income/(loss) Other Comprehensive Income (Loss), Net of Tax Other comprehensive income/(loss) Other comprehensive income/(loss), net of tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive loss attributable to Upjohn Inc. Statement of Financial Position [Abstract] Assets [Abstract] Assets Assets, Current Total current assets Assets Total assets Restricted Investments, Current Restricted short-term investments Restricted investments current Restricted short-term investments(a) Other Assets, Current Other current assets Liabilities and Equity [Abstract] Liabilities and Equity Liabilities, Current Total current liabilities Liabilities Total liabilities Other Liabilities, Current Other current liabilities Long-term Debt, Excluding Current Maturities  Long-term debt Long-term debt Commitments and Contingencies Commitments and Contingencies Common Stock, Value, Issued Common stock, $0.01 par value; 1,000 shares authorized; issued: 2020—100 shares; 2019—100 shares Additional Paid in Capital Additional paid-in capital Receivable from Shareholders or Affiliates for Issuance of Capital Stock Due from shareholder Due from shareholder Retained Earnings (Accumulated Deficit) Retained earnings/(loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income/(loss) Stockholders' Equity Attributable to Parent Total Upjohn Inc. shareholder's equity/(deficit) Balance Balance Liabilities and Equity Total liabilities and equity Common Stock, Par or Stated Value Per Share Common stock, par value Common stock, par value Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Statement of Stockholders' Equity [Abstract] Shares, Issued Balance (Shares) Balance (Shares) Net Transfers To Parent Net transfer—Pfizer Net transfers to parent. Equity Components [Axis] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Add'l Paid-In Capital [Member] Retained Earnings [Member] AOCI Attributable to Parent [Member] Accum. Other Comp. Income/ (Loss) [Member] Due From Share Holder [Member] Due From Share Holder [Member] Due from share holder [member]. Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Operating Activities Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash provided by operating activities: Increase (Decrease) in Operating Capital Other changes in assets and liabilities Amortization of Debt Issuance Costs Amortization of bond discount and issuance costs Other Adjustments Net Other adjustments, net Other adjustments net. Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Investing Activities Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Payments for (Proceeds from) Short-term Investments Net (purchases of)/proceeds from redemptions/sales of short-term investments(a) Net Cash Provided by (Used in) Financing Activities [Abstract] Financing Activities Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Proceeds from Issuance of Long-term Debt Proceeds from issuance of long-term debt(a) Proceeds from term loan facility Payments of Debt Issuance Costs Long-term debt issuance costs paid(a) Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Effect of exchange-rate changes on cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net increase/(decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents, beginning Cash and cash equivalents, end Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information Income Taxes Paid Income taxes Interest Paid, Including Capitalized Interest, Operating and Investing Activities Interest Accounting Policies [Abstract] Organization and Basis of Presentation Business Description and Basis of Presentation [Text Block] Organization and Basis of Presentation Significant Accounting Policies [Text Block] Significant Accounting Policies Other Income, Nonoperating [Abstract] Schedule of Other Nonoperating Income, by Component [Table Text Block] Other Income/(Deductions)—Net Income Tax Disclosure [Abstract] Income Tax Disclosure [Text Block] Tax Matters Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Financial Instruments Disclosure [Text Block] Financial Instruments Other Assets, Miscellaneous [Abstract] Other Assets And Liabilities [Text Block] Other Assets and Liabilities Other assets and liabilities [Text block]. Stockholders' Equity Note [Abstract] Equity Stockholders' Equity Note Disclosure [Text Block] Equity Basis of Accounting [Text Block] Basis of Presentation Use of Estimates, Policy [Policy Text Block] Estimates and Assumptions Fair Value Measurement, Policy [Policy Text Block] Fair Value Foreign Currency Transactions and Translations Policy [Policy Text Block] Foreign Currency Translation Investment, Policy [Policy Text Block] Investments Income Tax, Policy [Policy Text Block] Tax Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Unsecured Debt [Member] Unsecured Debt [Member] Fair Value Of Financial Instruments Measured On A Recurring Basis [Line Items] Fair value of financial instruments measured on a recurring basis [Line Items]. Fair Value Of Financial Instruments Measured On A Recurring Basis [Table Text Block] Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis Fair Value Of Financial Instruments Measured On A Recurring Basis [Table Text Block]. Fair Value Of Financial Assets And Liabilities Not Measured On A Recurring Basis [Table Text Block] Fair Value of Financial Assets and Liabilities Not Measured on a Recurring Basis Fair Value Of Financial Assets And Liabilities Not Measured On A Recurring Basis [Table Text Block]. Schedule of Long-term Debt Instruments [Table Text Block] Long-Term Debt Schedule of Other Nonoperating Income (Expense) [Table Text Block] Other Income/(Deductions)—Net Noncontrolling Interest, Ownership Percentage by Parent Ownership percent Business Combination Partial Consideration Transferred Business combination, partial consideration transferred Business combination, partial consideration transferred Business combination partial consideration transferred. Ownership [Axis] Ownership [Axis] Ownership [Domain] Ownership [Domain] Pfizer Stockholders [Member] Pfizer Stockholders [Member] Pfizer Stockholders [Member] Pfizer stockholders [member]. Mylan Shareholders [Member] Mylan Shareholders [Member] Mylan Shareholders [member]. Scenario [Axis] Scenario [Domain] Forecast [Member] Scenario Forecast [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Interest Income, Other Interest income Interest Expense Interest expense Interest Income (Expense), Nonoperating, Net Net interest expense Foreign Currency Transaction Gain (Loss), before Tax Foreign exchange (gain)/loss, net Debt Instrument, Face Amount Debt instrument face value Total long-term debt, principal amount Debt instrument face value Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] senior unsecured notes [Member] senior unsecured notes [member]. Fair Value Of Financial Instruments Measured On A Recurring Basis [Table] Fair value of financial instruments measured on a recurring basis [Table]. Equity Securities, FV-NI Money market funds(a) Short-term Investments Total short-term investments Measurement Frequency [Axis] Measurement Frequency [Domain] Fair Value, Recurring [Member] Fair Value, Recurring [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 2 [Member] Level 2 Fair Value Of Financial Assets And Liabilities Not Measured On A Recurring Basis [Table] Fair Value Of Financial Assets And Liabilities Not Measured On A Recurring Basis [Line Items] Fair Value, Nonrecurring [Member] Fair Value, Nonrecurring [Member] Schedule of Long-term Debt Instruments [Table] Notes Due Twenty Twenty Two [Member] Notes due 2022 (0.984%) Notes due twenty twenty two member. Notes Due Twenty Twenty Four [Member] Notes due 2024 (1.023%) Notes due twenty twenty four member. Notes Due Twenty Twenty Five [Member] Notes due 2025 (1.650%) Notes due twenty twenty five member. Notes Due Twenty Twenty Seven [Member] Notes due 2027 (1.775%) Notes due twenty twenty seven member. Notes Due Twenty Thirty [Member] Notes due 2030 (2.700%) Notes due twenty thirty member. Notes Due Twenty Thirty Two [Member] Notes due 2032 (1.908%) Notes due twenty thirty two member. Notes Due Twenty Forty [Member] Notes due 2040 (3.850%) Notes due twenty forty member. Notes Due Twenty Fifty [Member] Notes due 2050 (4.000%) Notes due twenty fifty member. Debt Instrument [Line Items] Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Net unamortized discounts and debt issuance costs Long-term Debt Total long-term debt, carried at historical proceeds, as adjusted Debt Instrument, Maturity Date Maturity Date     Debt Instrument, Currency Issue Currency One Point One Two Five Percent US Dollar Senior Notes [Member] 1.125% U.S. dollar notes [Member] One Point One Two Five Percent US Dollar Senior Notes. One Point Six Five Zero Percent US Dollar Senior Notes [Member] 1.650% U.S. dollar notes [Member] One Point Six Five Zero Percent US Dollar Senior Notes. Two Point Three Zero Percent US Dollar Senior Notes [Member] 2.300% U.S. dollar notes [Member] Two Point Three Zero Percent US Dollar Senior Notes. Two Point Seven Zero Percent US Dollar Senior Notes [Member] 2.700% U.S. dollar notes [Member] Two Point Seven Zero Percent US Dollar Senior Notes. Three Point Eight Five Zero Percent US Dollar Senior Notes [Member] 3.850% U.S. dollar notes [Member] Three Point Eight Five Zero Percent US Dollar Senior Notes. Four Point Zero Zero Zero Percent US Dollar Senior Notes [Member] 4.000% U.S. dollar notes [Member] Four Point Zero Zero Zero Percent US Dollar Senior Notes. Zero Point Eight One Six Percent Euro Notes [Member] 0.816% Euro notes [Member] Zero Point Eight One Six Percent Euro Notes. One Point Zero Two Three Percent Euro Notes [Member] 1.023% Euro notes [Member] One Point Zero Two Three Percent Euro Notes. One Point Three Six Two Percent Euro Notes [Member] 1.362% Euro notes [Member] One Point Three Six Two Percent Euro Notes. One Point Nine Zero Eight Percent Euro Notes [Member] 1.908% Euro notes [Member] One Point Nine Zero Eight Percent Euro Notes. Upjohn [Member] Upjohn [Member] Upjohn member. Upjohn Finance BV [Member] Upjohn Finance BV [Member] Upjohn Finance BV member. Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate Long term debt instrument fixed rate of interest Long-term Debt, Weighted Average Interest Rate, at Point in Time Long term debt effective weighted average interest rate Debt Instrument, Unamortized Discount Discount on debt issue Debt Issuance Cost, Gross, Noncurrent Debt issuance costs incurred Debt Issuance Costs Payable Current Debt issuance costs payable current Debt issuance costs payable current Debt issuance costs payable current. Line of Credit Facility, Maximum Borrowing Capacity Line of credit maximum borrowing capacity Line Of Credit Facility Terminated Line of credit facility terminated Line of credit facility terminated Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases Line of Credit Facility, Capacity Available for Specific Purpose Term Loan Facility [Member] Term Loan Facility [Member] Term Loan Facility Other Assets And Liabilities [Line Items] Other Assets And Liabilities [Line Items] Other Assets And Liabilities [Line Items]. Interest Receivable, Current Interest receivable current Interest Payable, Current Acrrued interest payable current Related Party [Axis] Related Party [Domain] Pfizer Inc [Member] Pfizer Inc. Common Stock, Shares, Outstanding Common stock, shares outstanding