Debt (Upjohn Senior Notes) (Details) € in Millions, $ in Millions	Oct. 29, 2021	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 EUR (€)
Debt Instrument [Line Items]
Debt Instrument, Conversion Of Unregistered Notes To Registered Notes, As A Percentage	99.90%
Upjohn Inc.
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 11,847.8
Upjohn Inc. | Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 7,450.0
Upjohn Inc. | Senior Notes | 2022 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount			1,000.0
Upjohn Inc. | Senior Notes | 2025 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount			750.0
Upjohn Inc. | Senior Notes | 2027 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount			750.0
Upjohn Inc. | Senior Notes | 2030 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount			1,450.0
Upjohn Inc. | Senior Notes | 2040 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount			1,500.0
Upjohn Inc. | Senior Notes | 2050 Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount			2,000.0
Upjohn Inc. | Senior Notes | 2022 Euro Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount			916.2
Upjohn Inc. | Senior Notes | 2027 Euro Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount			1,038.4
Upjohn Inc. | Senior Notes | 2.250% Euro Senior Notes due 2024
Debt Instrument [Line Items]
Debt Instrument, Face Amount			916.2
Upjohn Inc. | Senior Notes | 2032 Euro Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount			1,527.0
Upjohn Inc. | Senior Notes | Upjohn Euro Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount | €				€ 3,600
Upjohn Inc. | Senior Notes | Unregistered Upjohn U.S. Dollar Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 7,450.0