Basis of Presentation (Schedule of Cash Activity) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 511	$ 555	$ 571
Program cash	68	85	109
Restricted cash	4		2
Total cash and cash equivalents, program and restricted cash	$ 583	$ 644	$ 682	$ 642