Organization and Basis of Presentation (Schedule of Allocated Losses from Subsidiaries, Noncontrolling Interest) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Allocated losses to noncontrolling tax equity members utilizing the HLBV method	$ 119	$ 59	$ 217	$ 187
Allocated losses to noncontrolling members based on pro rata shares of ownership	10	11	30	21
Total Noncontrolling Interest Allocated Losses	$ 129	$ 70	$ 247	$ 208