Basis of Presentation (Schedule of Cash Activity) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 550	$ 534	$ 576
Program cash	85	89	61
Restricted cash	2		2
Total cash and cash equivalents, program and restricted cash	$ 637	$ 626	$ 639	$ 765