Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current income tax expense:
U.S. federal	$ 2,455	$ 2,445	$ 1,656
U.S. state and local	351	339	351
Non-U.S.	662	476	328
Total current income tax expense	3,468	3,260	2,335
Deferred income tax (benefit) expense:
U.S. federal	(952)	(763)	231
U.S. state and local	(139)	(117)	22
Non-U.S.	(238)	(309)	41
Total deferred income tax (benefit) expense	(1,329)	(1,189)	294
Income tax expense (benefit)	$ 2,139	$ 2,071	$ 2,629