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v3.19.3.a.u2

Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) MW
Accounting Policies [Abstract] |
Sale of noncontrolling interest | $ 428
Plant capacity sold (in MW) | MW | 718
Allocation of losses to noncontrolling tax equity members | $ 165

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