Changes in Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 34,280	$ 32,311	$ 33,474	$ 30,264
Net Change	(38)	(1)	(116)	146
Ending Balance	35,797	32,417	35,797	32,417
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	(30)	(8)	(19)	(212)
Accumulated other comprehensive income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(3,355)	(3,248)	(3,277)	(3,395)
Net Change	(38)	(1)	(116)	146
Ending Balance	(3,393)	(3,249)	(3,393)	(3,249)
Net unrealized gains (losses) on debt securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(22)	(6)	(4)	(9)
Net Change	(35)	1	(53)	4
Ending Balance	(57)	(5)	(57)	(5)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	(12)	0	(17)	1
Foreign Currency Translation Adjustment Gains (Losses), net of hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,842)	(2,792)	(2,783)	(2,924)
Net Change	(20)	(6)	(79)	126
Ending Balance	(2,862)	(2,798)	(2,862)	(2,798)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	(18)	(11)	(18)	(208)
Net unrealized pension and other postretirement benefit gains (losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(491)	(450)	(490)	(462)
Net Change	17	4	16	16
Ending Balance	(474)	(446)	(474)	(446)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	$ 1	$ 3	$ 16	$ (4)