Equity - Amounts Reclassified Out Of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Significant amounts reclassified out of each component of AOCI
Gain on derivative amount excluded from effectiveness testing			$ (2,384)	$ (2,280)	$ (1,509)
Tax expense (benefit)			1,440	(1,224)	544
Total reclassifications, net of tax		$ (4,044)	(11,542)	(4,616)	(7,882)
Losses (gains) on foreign currency exchange contracts			17,446	15,387	7,439
Pension and post-employment benefits
Significant amounts reclassified out of each component of AOCI
Amortization of actuarial losses and other	[1]		283	251	110
Tax benefit			(60)	(53)	(23)
Total reclassifications, net of tax			223	198	87
Cash flow hedging activities
Significant amounts reclassified out of each component of AOCI
Total reclassifications, net of tax			75	(23)	(157)
Reclassification out of accumulated other comprehensive loss | Cash flow hedging activities
Significant amounts reclassified out of each component of AOCI
Tax expense (benefit)			(12)	7	14
Total reclassifications, net of tax			75	(23)	(157)
Reclassification out of accumulated other comprehensive loss | Net investment hedges | Net investment hedging activities
Significant amounts reclassified out of each component of AOCI
Gain on derivative amount excluded from effectiveness testing	[2]		26	18	27
Tax expense (benefit)			5	4	6
Total reclassifications, net of tax			(21)	(14)	(21)
Foreign currency forward exchange contracts | Reclassification out of accumulated other comprehensive loss | Cash flow hedging activities
Significant amounts reclassified out of each component of AOCI
Losses (gains) on foreign currency exchange contracts	[3]		87	(23)	(167)
Treasury rate lock agreements | Reclassification out of accumulated other comprehensive loss | Cash flow hedging activities
Significant amounts reclassified out of each component of AOCI
Gain on derivative amount excluded from effectiveness testing	[2]		(24)	(24)	(3)
Interest rate swap contracts | Reclassification out of accumulated other comprehensive loss | Cash flow hedging activities
Significant amounts reclassified out of each component of AOCI
Gain on derivative amount excluded from effectiveness testing	[2]		$ 24	$ 17	$ (1)

[1] Amounts are included in the computation of net periodic benefit cost (see Note 12).

[2] Amounts are included in interest expense, net (see Note 11).

[3] Amounts are included in cost of products sold (see Note 11).