Goodwill and Other Intangible Assets (Changes in Carrying Amount Of Goodwill) (Details) € in Millions, ¥ in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2023 JPY (¥)	Dec. 31, 2022 EUR (€)	Dec. 31, 2022 JPY (¥)
Goodwill [Line Items]
Goodwill	$ 10,425.8	$ 9,867.1	$ 10,425.8	$ 12,113.7
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill				(919.7)
Foreign currency translation			115.4	(651.2)
Goodwill, Transfers		(189.0)
Impairment of goodwill		(581.0)	(117.0)	0.0
Goodwill, net, ending balance	10,425.8	9,867.1	10,425.8	12,113.7
Goodwill, Acquired During Period		95.9
Net Investment Hedging
Goodwill [Line Items]
Notional amount of derivative					€ 5,600.0	¥ 40,000	€ 5,100.0	¥ 40,000
2020 Floating Rate Euro Notes | Net Investment Hedging
Goodwill [Line Items]
Notional amount of derivative | €					€ 500.0		€ 0.0
Developed Markets
Goodwill [Line Items]
Goodwill	7,461.5	7,107.4	7,461.5	8,723.4
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill				(743.9)
Foreign currency translation			146.0	(518.0)
Goodwill, Transfers		(52.0)
Impairment of goodwill		(544.0)
Goodwill, net, ending balance	7,461.5	7,107.4	7,461.5	8,723.4
Goodwill, Acquired During Period		95.9
Goodwill, Impaired, Accumulated Impairment Loss	385.0	929.0	385.0	385.0
Greater China
Goodwill [Line Items]
Goodwill	940.6	932.8	940.6	969.5
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill				(2.7)
Foreign currency translation			(7.8)	(26.2)
Goodwill, Transfers		0.0
Impairment of goodwill		0.0
Goodwill, net, ending balance	940.6	932.8	940.6	969.5
Goodwill, Acquired During Period		0.0
JANZ
Goodwill [Line Items]
Goodwill	689.0	645.7	689.0	776.3
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill				(32.6)
Foreign currency translation			(13.3)	(54.7)
Goodwill, Transfers		0.0
Impairment of goodwill		(30.0)
Goodwill, net, ending balance	689.0	645.7	689.0	776.3
Goodwill, Acquired During Period		0.0
Goodwill, Impaired, Accumulated Impairment Loss		30.0
Emerging Markets
Goodwill [Line Items]
Goodwill	1,334.7	1,181.2	1,334.7	1,644.5
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill				(140.5)
Foreign currency translation			(9.5)	(52.3)
Goodwill, Transfers		(137.0)
Goodwill, net, ending balance	1,334.7	1,181.2	1,334.7	$ 1,644.5
Goodwill, Acquired During Period		0.0
Emerging Markets | Disposal Group, Held-for-sale, Not Discontinued Operations | Upjohn Distributor Markets
Goodwill [Line Items]
Impairment of goodwill	(117.0)	(7.0)
Goodwill, Impaired, Accumulated Impairment Loss	$ 117.0	$ (124.0)	$ 117.0