Income Taxes (Provision (Benefit) for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ (4)	$ 47	$ 0
State	(1)	4	0
Total Current	(5)	51	0
Deferred:
Federal	(192)	0	0
State	(60)	0	0
Total Deferred	(252)	0	0
Provision (Benefit) for Income Taxes	$ (257)	$ 51	$ 0