Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 28,764	$ 25,992	$ 28,057	$ 24,711
Net change	(45)	22	(128)	126
Ending Balance	29,540	26,703	29,540	26,703
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	8	(58)	60	(92)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(3,155)	(3,106)	(3,072)	(3,210)
Net change	(45)	22	(128)	126
Ending Balance	(3,200)	(3,084)	(3,200)	(3,084)
Net Unrealized Gains (Losses) on Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(13)	(45)	(14)	(64)
Net change	3	1	4	20
Ending Balance	(10)	(44)	(10)	(44)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	1	0	2	6
Foreign Currency Translation Adjustment Gains (Losses), net of hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,658)	(2,594)	(2,571)	(2,622)
Net change	(49)	25	(136)	53
Ending Balance	(2,707)	(2,569)	(2,707)	(2,569)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	7	(53)	56	(98)
Net Unrealized Pension and Other Postretirement Benefit Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(484)	(467)	(487)	(524)
Net change	1	(4)	4	53
Ending Balance	(483)	(471)	(483)	(471)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	$ 0	$ (5)	$ 2	$ 0