Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 24,711	$ 22,177	$ 22,984
Net change	138	(265)	(50)
Ending Balance	28,057	24,711	22,177
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	(145)	75	90
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(3,210)	(2,945)	(2,895)
Net change	138	(265)	(50)
Ending Balance	(3,072)	(3,210)	(2,945)
Net Unrealized Gains (Losses) on Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(64)	23	65
Net change	50	(87)	(42)
Ending Balance	(14)	(64)	23
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	16	(27)	(13)
Foreign Currency Translation Adjustment Gains (Losses), Net of Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,622)	(2,392)	(2,229)
Net change	51	(230)	(163)
Ending Balance	(2,571)	(2,622)	(2,392)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	(158)	75	51
Net Unrealized Pension and Other Postretirement Benefit Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(524)	(576)	(731)
Net change	37	52	155
Ending Balance	(487)	(524)	(576)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	$ (3)	$ 27	$ 52