Cover [Abstract] Document Type Amendment Flag Document Fiscal Year Focus Document Period End Date Document Fiscal Period Focus Document Annual Report 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 Entity Filer Category 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 Entity Voluntary Filers Entity Well-known Seasoned Issuer Entity Public Float Income Statement [Abstract] Revenue from Contract with Customer, Excluding Assessed Tax Revenues Operating Expenses Operating expenses Other Nonoperating Income (Expense) Other (income)/deductions—net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income before provision/(benefit) for taxes on income Income Tax Expense (Benefit) Provision/(benefit) for taxes on income Net Income (Loss) Attributable to Parent Net income Net income Earnings Per Share, Basic Earnings per common share—basic Weighted Average Number of Shares Outstanding, Basic Weighted-average common shares—basic 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 income attributable to Upjohn Inc. Statement of Financial Position [Abstract] Assets [Abstract] Assets Assets, Current Total current assets Assets Total assets Liabilities and Equity [Abstract] Liabilities and Equity Liabilities, Current Total current liabilities Liabilities Total liabilities Commitments and Contingencies Commitments and Contingencies Common Stock, Value, Issued Common stock, $0.01 par value; 1,000 shares authorized; issued: 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 Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income/(loss) Stockholders' Equity Attributable to Parent Total Upjohn Inc. shareholder's equity Initial capitalization, February 14, 2019 (date of incorporation) 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, Outstanding Initial capitalization, February 14, 2019 (date of incorporation), Shares Balance (Shares) 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 income to net cash provided by operating activities: Increase (Decrease) in Operating Capital Other changes in assets and liabilities: 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 provided by investing activities 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 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 Stockholders' Equity Note [Abstract] Equity Stockholders' Equity Note Disclosure [Text Block] Equity Basis of Accounting [Text Block] Basis of Presentation Noncontrolling Interest, Ownership Percentage by Parent Ownership percent Debt In Connection With Its Separation From Parent Company Debt in connection with its separation from parent company Debt in connection with its separation from parent company. Business Combination, Consideration Transferred Business combination, consideration transferred Ownership [Axis] Ownership [Domain] 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] Common Stock, Shares, Outstanding Common stock, shares outstanding