Income Taxes - Summary of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current
Federal	$ 387	$ 791	$ 207
State	42	78	11
Total	429	869	218
Deferred
Federal	52	217	119
State	22	18	7
Total	74	235	126
Income tax expense	$ 503	$ 1,104	$ 344