Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal
Current	$ 5	$ 5	$ 7
Deferred	514	338	376
State
Current	42	50	15
Deferred	72	55	81
Foreign
Current	23	29	35
Deferred	12	(27)	(11)
Total income tax expense	668	450	503
Income tax expense allocation
Attributable to income	668	450	503
Stockholders' equity:
Tax effect of the change in accumulated other comprehensive loss	$ 222	$ 17	$ (62)