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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		12 Months Ended
	Jun. 02, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		$ 25,404	$ 26,001	$ 26,882
Other comprehensive income (loss) before reclassification adjustments, pretax		1,951	(915)	(610)
Tax		(568)	284	161
Other comprehensive income (loss) before reclassification adjustments, net of taxes		1,383	(631)	(449)
Reclassification adjustments, pretax		473	253	(239)
Tax		(100)	(63)	40
Reclassification adjustments, net of taxes		373	190	(199)
Other comprehensive income (loss), net of taxes		1,756	(441)	(648)
Spin-off of Organon & Co.		5,091
Ending balance		38,257	25,404	26,001
Derivatives
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(266)	31	166
Other comprehensive income (loss) before reclassification adjustments, pretax		333	(383)	86
Tax		(75)	84	(15)
Other comprehensive income (loss) before reclassification adjustments, net of taxes		258	(299)	71
Reclassification adjustments, pretax		192	2	(261)
Tax		(40)	0	55
Reclassification adjustments, net of taxes		152	2	(206)
Other comprehensive income (loss), net of taxes		410	(297)	(135)
Spin-off of Organon & Co.		0
Ending balance		144	(266)	31
Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		0	18	(78)
Other comprehensive income (loss) before reclassification adjustments, pretax		0	3	140
Tax		0	0	0
Other comprehensive income (loss) before reclassification adjustments, net of taxes		0	3	140
Reclassification adjustments, pretax		0	(21)	(44)
Tax		0	0	0
Reclassification adjustments, net of taxes		0	(21)	(44)
Other comprehensive income (loss), net of taxes		0	(18)	96
Spin-off of Organon & Co.		0
Ending balance		0	0	18
Employee Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(4,540)	(4,261)	(3,556)
Other comprehensive income (loss) before reclassification adjustments, pretax		1,922	(599)	(948)
Tax		(374)	111	192
Other comprehensive income (loss) before reclassification adjustments, net of taxes		1,548	(488)	(756)
Reclassification adjustments, pretax		281	272	66
Tax		(60)	(63)	(15)
Reclassification adjustments, net of taxes		221	209	51
Other comprehensive income (loss), net of taxes		1,769	(279)	(705)
Spin-off of Organon & Co.	$ 28	28
Ending balance		(2,743)	(4,540)	(4,261)
Pension Plan Net Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Pension and other postretirement benefit plans, net loss and prior service (credit) included in AOCI		3,600	5,400
Other Postretirement Benefit Plan Net Gain
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Pension and other postretirement benefit plans, net loss and prior service (credit) included in AOCI		(473)	(391)
Pension Plan Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Pension and other postretirement benefit plans, net loss and prior service (credit) included in AOCI		(190)	(255)
Other Postretirement Benefit Plan Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Pension and other postretirement benefit plans, net loss and prior service (credit) included in AOCI		(181)	(244)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(1,828)	(1,981)	(2,077)
Other comprehensive income (loss) before reclassification adjustments, pretax		(304)	64	112
Tax		(119)	89	(16)
Other comprehensive income (loss) before reclassification adjustments, net of taxes		(423)	153	96
Reclassification adjustments, pretax		0	0	0
Tax		0	0	0
Reclassification adjustments, net of taxes		0	0	0
Other comprehensive income (loss), net of taxes		(423)	153	96
Spin-off of Organon & Co.	421	421
Ending balance		(1,830)	(1,828)	(1,981)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(6,634)	(6,193)	(5,545)
Spin-off of Organon & Co.	$ 449	449
Ending balance		$ (4,429)	$ (6,634)	$ (6,193)

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