Basis of Presentation (Schedule of Cash Activity) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 516	$ 534	$ 522
Program cash	87	60	73
Restricted cash	4		4
Total cash and cash equivalents, program and restricted cash	$ 607	$ 597	$ 599	$ 644