Income Taxes (Benefit (Provision) for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Current Federal	$ (7)	$ (6)	$ (5)
Current Foreign	(9)	(9)	(8)
Current State	(2)	2	(4)
Total current	(18)	(13)	(17)
Deferred Foreign	(8)	(3)	(4)
Total deferred	(8)	(3)	(4)
Benefit (provision) for income taxes	$ (26)	$ (16)	$ (21)