Accumulated Other Comprehensive Loss, Excluding Noncontrolling Interests (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		$ 77,462	$ 63,473	$ 63,447
Other comprehensive income/(loss)		(2,422)	(589)	471
Distribution of Upjohn Business	[1]			(2,018)
Ending balance		95,916	77,462	63,473
Accumulated Other Comprehensive Income/(Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(5,897)	(5,310)	(5,367)
Other comprehensive income/(loss)	[2]	(2,407)	(587)	480
Distribution of Upjohn Business	[1],[3]			(423)
Ending balance		(8,304)	(5,897)	(5,310)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(6,172)	(5,450)	(5,936)
Other comprehensive income/(loss)	[2]	(2,188)	(722)	883
Distribution of Upjohn Business	[3]			(397)
Ending balance		(8,360)	(6,172)	(5,450)
Derivative Financial Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		119	(428)	20
Other comprehensive income/(loss)	[2]	(531)	547	(448)
Distribution of Upjohn Business	[3]			0
Ending balance		(412)	119	(428)
Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(220)	116	(35)
Other comprehensive income/(loss)	[2]	440	(336)	151
Distribution of Upjohn Business	[3]			0
Ending balance		220	(220)	116
Prior Service (Costs)/Credits and Other [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		377	452	584
Other comprehensive income/(loss)	[2]	(129)	(75)	(106)
Distribution of Upjohn Business	[3]			(26)
Ending balance		$ 248	$ 377	$ 452

[1] See Note 2B.

[2] Amounts do not include foreign currency translation adjustments attributable to noncontrolling interests. Foreign currency translation adjustments include net losses in 2022 and 2021 and net gains in 2020 related to our equity-method investment in Haleon/the Consumer Healthcare JV (see Note 2C), and the impact of our net investment hedging program.

[3] For more information, see Note 2B.