Summary of Significant Accounting Policies (Schedule of Cash and Cash equivalents) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Cash and cash equivalents		$ 11	$ 30	$ 5	$ 4
Restricted cash and equivalents	[1]		24
Cash, restricted cash and equivalents shown in the Consolidated Statements of Cash Flows		$ 11	$ 54	$ 5	$ 4

[1] Restricted cash and equivalent balances are presented within other current assets on the Consolidated Balance Sheets.