Basis of Presentation (Schedule of Cash Activity) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 571	$ 570	$ 579
Program cash	109	70	103
Restricted cash	2		2
Total cash and cash equivalents, program and restricted cash	$ 682	$ 642	$ 684	$ 626