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Summary of Significant Accounting Policies (Schedule of Cash Received and Allocated Losses from Subsidiaries, Noncontrolling Interest) (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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