Basis of Presentation (Schedule of Cash Activity) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 579	$ 534	$ 1,324
Program cash	103	89	84
Restricted cash	2		3
Total cash and cash equivalents, program and restricted cash	$ 684	$ 626	$ 1,411	$ 765