Summary of Significant Accounting Policies (Schedule of Cash Received and Allocated Losses from Subsidiaries, Noncontrolling Interest) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Allocated losses to noncontrolling tax equity members utilizing the HLBV method	$ 298	$ 271	$ 165
Allocated losses to noncontrolling members based on pro rata shares of ownership	31	24	12
Total Noncontrolling Interest Allocated Losses	$ 329	$ 295	$ 177