Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 29,540	$ 26,703	$ 28,057	$ 24,711
Net change	5	(92)	(123)	34
Ending Balance	29,707	27,324	29,707	27,324
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	(33)	77	27	(15)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(3,200)	(3,084)	(3,072)	(3,210)
Net change	5	(92)	(123)	34
Ending Balance	(3,195)	(3,176)	(3,195)	(3,176)
Net Unrealized Gains (Losses) on Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(10)	(44)	(14)	(64)
Net change	4	14	8	34
Ending Balance	(6)	(30)	(6)	(30)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	0	5	2	11
Foreign Currency Translation Adjustment Gains (Losses), net of hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,707)	(2,569)	(2,571)	(2,622)
Net change	1	(110)	(135)	(57)
Ending Balance	(2,706)	(2,679)	(2,706)	(2,679)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	(26)	66	30	(32)
Net Unrealized Pension and Other Postretirement Benefit Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(483)	(471)	(487)	(524)
Net change	0	4	4	57
Ending Balance	(483)	(467)	(483)	(467)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Tax expense (benefit)	$ (7)	$ 6	$ (5)	$ 6