Income Taxes - Breakdown of Income Tax Expense Between Current and Deferred (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal	$ 827	$ 559	$ 608
State	176	123	104
Subtotal Current	1,003	682	712
Deferred:
Federal	166	149	235
State	1	31	38
Subtotal Deferred	167	180	273
Total Income Tax Expense	$ 1,170	$ 862	$ 985