Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 25,992	$ 22,383	$ 24,711	$ 22,177
Net change	22	(170)	126	(198)
Ending Balance	26,703	23,235	26,703	23,235
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	(58)	95	(92)	63
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(3,106)	(2,973)	(3,210)	(2,945)
Net change	22	(170)	126	(198)
Ending Balance	(3,084)	(3,143)	(3,084)	(3,143)
Net Unrealized Gains (Losses) on Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(45)	(5)	(64)	23
Net change	1	(25)	20	(53)
Ending Balance	(44)	(30)	(44)	(30)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	0	(7)	6	(16)
Foreign Currency Translation Adjustment Gains (Losses), net of hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,594)	(2,412)	(2,622)	(2,392)
Net change	25	(157)	53	(177)
Ending Balance	(2,569)	(2,569)	(2,569)	(2,569)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	(53)	92	(98)	62
Net Unrealized Pension and Other Postretirement Benefit Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(467)	(556)	(524)	(576)
Net change	(4)	12	53	32
Ending Balance	(471)	(544)	(471)	(544)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	$ (5)	$ 10	$ 0	$ 17