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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Cash received for the sale of noncontrolling interest to tax equity members | $ 426 | $ 428 |
Cash received for the sale of noncontrolling interest to pro rata share members |  | 415 |
Total Noncontrolling Interest Capital Contributions | 426 | 843 | $ 41
Allocated losses to noncontrolling tax equity members utilizing the HLBV method | 271 | 165 |
Allocated losses to noncontrolling members based on pro rata shares of ownership | 24 | 12 |
Total Noncontrolling Interest Allocated Losses | $ 295 | $ 177 |

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- Definition Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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