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Variable Interest Entities - Net Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Business Acquisition [Line Items] |  |
Noncontrolling interest | $ 218 | $ 191
Great Valley Solar |  |
Business Acquisition [Line Items] |  |
Non-utility property, less accumulated depreciation | 284 | 293
Other assets | 39 | 40
Total assets | 323 | 333
Other liabilities | 13 | 17
Total liabilities | 13 | 17
Accumulated depreciation | 18 | 9
Copper Mountain Solar - Mesquite Solar |  |
Business Acquisition [Line Items] |  |
Non-utility property, less accumulated depreciation | 446 | 461
Other assets | 176 | 128
Total assets | 622 | 589
Other liabilities | 71 | 18
Total liabilities | 71 | 18
Accumulated depreciation | 30 | 15
Tax Equity Investors | Great Valley Solar |  |
Business Acquisition [Line Items] |  |
Noncontrolling interest | 82 | 62
Tax Equity Investors | Copper Mountain Solar - Mesquite Solar |  |
Business Acquisition [Line Items] |  |
Noncontrolling interest | $ 134 | $ 126

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