Basis of Presentation (Schedule of Cash Activity) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 602	$ 555	$ 572
Program cash	44	85	146
Restricted cash	3		3
Total cash and cash equivalents, program and restricted cash	$ 649	$ 644	$ 721	$ 642