Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 22,383	$ 24,449	$ 22,177	$ 22,984
Net change	(170)	17	(198)	14
Ending Balance	23,235	25,539	23,235	25,539
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	95	(39)	63	(23)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,973)	(2,898)	(2,945)	(2,895)
Ending Balance	(3,143)	(2,881)	(3,143)	(2,881)
Net Unrealized Gains (Losses) on Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(5)	53	23	65
Net change	(25)	(11)	(53)	(23)
Ending Balance	(30)	42	(30)	42
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	(7)	(3)	(16)	(6)
Foreign Currency Foreign Currency Translation Adjustment Gains (Losses), net of hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,412)	(2,246)	(2,392)	(2,229)
Net change	(157)	19	(177)	2
Ending Balance	(2,569)	(2,227)	(2,569)	(2,227)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	92	(38)	62	(30)
Net Unrealized Pension and Other Postretirement Benefit Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(556)	(705)	(576)	(731)
Net change	12	9	32	35
Ending Balance	(544)	(696)	(544)	(696)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	$ 10	$ 2	$ 17	$ 13