Organization and Basis of Presentation (Schedule of Cash Received and Allocated Losses from Subsidiaries, Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash received for the sale of noncontrolling interest to tax equity members	$ 303	$ 103
Cash received for the sale of noncontrolling interest to pro rata share members	0	0
Total Noncontrolling Interest Capital Contributions	303	103
Allocated losses to noncontrolling tax equity members utilizing the HLBV method	43	49
Allocated losses (gains) to noncontrolling members based on pro rata shares of ownership	8	(1)
Total Noncontrolling Interest Allocated Losses	$ 51	$ 48