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Debt (Senior Notes) (Details) $ in Millions, ¥ in Billions	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jul. 31, 2021 JPY (¥) Rate	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)
Debt Instrument [Line Items]
Long-term debt	$ 19,717.1				$ 22,429.2
Long-term Debt, Gross	$ 20,949.0
Upjohn Inc.
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 11,847.8
2020 Euro Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	0.816%
YEN Term Loan
Debt Instrument [Line Items]
Long-term debt	$ 347.6
Senior Notes \| Upjohn Inc.
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 7,450.0
Senior Notes \| 2.250% Euro Senior Notes due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.25%
Long-term debt	$ 1,135.8				1,219.9
Senior Notes \| 2.250% Euro Senior Notes due 2024 \| Upjohn Inc.
Debt Instrument [Line Items]
Debt Instrument, Face Amount				916.2
Senior Notes \| 2028 Euro Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.125%
Long-term debt	$ 847.4				909.7
Senior Notes \| 2028 Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.55%
Long-term debt	$ 748.7				748.6
Senior Notes \| 2048 Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.20%
Long-term debt	$ 747.8				747.7
Senior Notes \| 2025 Euro Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.125%
Long-term debt	$ 567.8				$ 609.9
Senior Notes \| USD Term Loan Facility
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 600.0
Revolving Credit Facility \| Twenty Twenty One Revolving Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 4,000.0
Revolving Credit Facility \| 2020 Revolving Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						$ 4,000.0
Medium-term Notes \| YEN Term Loan
Debt Instrument [Line Items]
Debt Instrument, Face Amount \| ¥			¥ 40
Medium-term Notes \| Twenty Twenty One Loan Facilities
Debt Instrument [Line Items]
Maximum Leverage Ratio, Period Two \| Rate			400.00%
Maximum Leverage Ratio, Period One \| Rate			425.00%
Maximum Leverage Ratio, Period Three \| Rate			375.00%