Income Taxes - Geographic Sources of Pretax Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Geographic sources of pretax income
United States									$ 3,199	$ 3,824		$ 3,961
Foreign									35	107		224
Pretax income	$ 494	$ 1,117	$ 1,127	$ 496	$ 817	$ 1,335	$ 773	$ 1,006	$ 3,234	$ 3,931	[1]	$ 4,185	[1]

[1] Certain prior period amounts have been restated. See Note 3 for more information.