Provision (Benefit) for Income Taxes Tax Provison (Benefit) Table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current :
Federal	$ 3	$ (25)	$ (1)
State	21	19	3
Total	24	(6)	2
Deferred:
Federal	872	424	421
State	109	7	88
Total	981	431	509
Less: Provision (benefit) for income taxes	$ 1,005	$ 425	$ 511