Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 28,057	$ 24,711
Net change	(83)	104
Ending Balance	28,764	25,992
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	52	(34)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(3,072)	(3,210)
Net change	(83)	104
Ending Balance	(3,155)	(3,106)
Net Unrealized Gains (Losses) on Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(14)	(64)
Net change	1	19
Ending Balance	(13)	(45)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	1	6
Foreign Currency Translation Adjustment Gains (Losses), net of hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,571)	(2,622)
Net change	(87)	28
Ending Balance	(2,658)	(2,594)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	49	(45)
Net Unrealized Pension and Other Postretirement Benefit Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(487)	(524)
Net change	3	57
Ending Balance	(484)	(467)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	$ 2	$ 5