Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Federal
Current	$ 7	$ 838	$ 5
Deferred	(2)	(332)	514
State
Current	(6)	283	42
Deferred	55	(191)	72
Foreign
Current	0	32	23
Deferred	7	(73)	12
Total income tax expense	61	557	668
Income tax expense in the consolidated statements of operations:
Income tax expense	61	557	668
Stockholders' equity:
Tax effect of the change in accumulated other comprehensive loss	$ (21)	$ 297	$ 222