Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 23,235	$ 25,539	$ 22,177	$ 22,984
Net change	(234)	(82)	(432)	(68)
Ending Balance	23,940	24,426	23,940	24,426
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	172	47	235	24
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(3,143)	(2,881)	(2,945)	(2,895)
Ending Balance	(3,377)	(2,963)	(3,377)	(2,963)
Net Unrealized Gains (Losses) on Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(30)	42	23	65
Net change	(39)	(8)	(92)	(31)
Ending Balance	(69)	34	(69)	34
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	(13)	(3)	(29)	(9)
Foreign Currency Foreign Currency Translation Adjustment Gains (Losses), net of hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,569)	(2,227)	(2,392)	(2,229)
Net change	(200)	(83)	(377)	(81)
Ending Balance	(2,769)	(2,310)	(2,769)	(2,310)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	169	45	231	15
Net Unrealized Pension and Other Postretirement Benefit Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(544)	(696)	(576)	(731)
Net change	5	9	37	44
Ending Balance	(539)	(687)	(539)	(687)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	$ 16	$ 5	$ 33	$ 18