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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Cash, Cash Equivalents and Restricted Cash:
Cash and cash equivalents	$ 171	$ 76
Restricted cash	143	130
Total cash, cash equivalents and restricted cash shown in the Unaudited Condensed Statements of Consolidated Cash Flows	314	$ 206	$ 255	$ 2,965
Allowance for Credit Losses [Member]
Movement in valuation allowances and reserves [Roll Forward]
Balance at beginning of period	54
Charged to costs and expenses	0
Charged to other accounts	0
Deductions	(5)
Balance at end of period	$ 49