Income Taxes - Summary of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current
Federal	$ 207	$ (32)	$ (29)
State	11	1	4
Total	218	(31)	(25)
Deferred
Federal	119	68	233
State	7	4	11
Total	126	72	244
Income tax expense	$ 344	$ 41	$ 219