Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Cash, Cash Equivalents and Restricted Cash:
Cash and cash equivalents	$ 231	$ 2,820
Restricted cash	166	145
Total cash, cash equivalents and restricted cash shown in the Unaudited Condensed Statements of Consolidated Cash Flows	397	$ 2,965	$ 611	$ 1,158
Allowance for Credit Losses [Member]
Movement in valuation allowances and reserves [Roll Forward]
Balance at beginning of period	53
Charged to costs and expenses	4
Charged to other accounts	1
Deductions	(4)
Balance at end of period	$ 54