Income Tax (Provision for Income Tax) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current:
Federal	$ (39)	$ (5)	$ (88)
Deferred:
Federal	24	(378)	883
Current and Deferred:
Provision for income tax expense (benefit)	$ (15)	$ (383)	$ 795