Income Taxes - Summary of Reconciliation of Income Taxes Computed at U.S. Federal Statutory Income Tax Rate to Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
U.S. Federal income tax expense at the statutory rate	$ 90	$ 108	$ 63
U.S. State income tax expense	15	17	2
Non-deductible expenses		2	6
CARES Act		27
Return to provision adjustments	1	(2)	3
Other		1	2
Total income tax expense	$ 106	$ 153	$ 76