Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 31,202	$ 28,764	$ 30,264	$ 28,057
Net Change	118	(45)	147	(128)
Ending Balance	32,311	29,540	32,311	29,540
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	(143)	8	(204)	60
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(3,366)	(3,155)	(3,395)	(3,072)
Net Change	118	(45)	147	(128)
Ending Balance	(3,248)	(3,200)	(3,248)	(3,200)
Net Unrealized Gains (Losses) on Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(6)	(13)	(9)	(14)
Net Change	0	3	3	4
Ending Balance	(6)	(10)	(6)	(10)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	0	1	0	2
Foreign Currency Translation Adjustment Gains (Losses), net of hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,907)	(2,658)	(2,924)	(2,571)
Net Change	115	(49)	132	(136)
Ending Balance	(2,792)	(2,707)	(2,792)	(2,707)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	(137)	7	(197)	56
Net Unrealized Pension and Other Postretirement Benefit Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(453)	(484)	(462)	(487)
Net Change	3	1	12	4
Ending Balance	(450)	(483)	(450)	(483)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	$ (6)	$ 0	$ (7)	$ 2