Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 26,703	$ 23,235	$ 24,711	$ 22,177
Net change	(92)	(234)	34	(432)
Ending Balance	27,324	23,940	27,324	23,940
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	77	172	(15)	235
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(3,084)	(3,143)	(3,210)	(2,945)
Net change	(92)	(234)	34	(432)
Ending Balance	(3,176)	(3,377)	(3,176)	(3,377)
Net Unrealized Gains (Losses) on Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(44)	(30)	(64)	23
Net change	14	(39)	34	(92)
Ending Balance	(30)	(69)	(30)	(69)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	5	(13)	11	(29)
Foreign Currency Translation Adjustment Gains (Losses), net of hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,569)	(2,569)	(2,622)	(2,392)
Net change	(110)	(200)	(57)	(377)
Ending Balance	(2,679)	(2,769)	(2,679)	(2,769)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	66	169	(32)	231
Net Unrealized Pension and Other Postretirement Benefit Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(471)	(544)	(524)	(576)
Net change	4	5	57	37
Ending Balance	(467)	(539)	(467)	(539)
Tax impact for the changes in each component of accumulated other comprehensive (loss) income
Total tax impact	$ 6	$ 16	$ 6	$ 33