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Variable Interest Entities - Net Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Business Acquisition [Line Items] |  |
Noncontrolling interest | $ 191 | $ 113
Great Valley Solar |  |
Business Acquisition [Line Items] |  |
Restricted cash | 0 | 0
Non-utility property, less accumulated depreciation | 293 | 313
Other assets | 40 | 18
Total assets | 333 | 331
Long-term debt due within one year | 0 | 0
Other liabilities | 17 | 17
Long-term debt | 0 | 0
Total liabilities | 17 | 17
Accumulated depreciation | 9 | 1
Copper Mountain Solar - Mesquite Solar |  |
Business Acquisition [Line Items] |  |
Restricted cash | 0 | 0
Non-utility property, less accumulated depreciation | 461 | 492
Other assets | 128 | 97
Total assets | 589 | 589
Long-term debt due within one year | 0 | 0
Other liabilities | 18 | 33
Long-term debt | 0 | 0
Total liabilities | 18 | 33
Accumulated depreciation | 15 | 1
Texas Solar 4 |  |
Business Acquisition [Line Items] |  |
Restricted cash |  | 4
Non-utility property, less accumulated depreciation |  | 98
Other assets |  | 9
Total assets |  | 111
Long-term debt due within one year |  | 2
Other liabilities |  | 26
Long-term debt |  | 56
Total liabilities |  | 84
Accumulated depreciation |  | 15
Tax Equity Investors | Great Valley Solar |  |
Business Acquisition [Line Items] |  |
Noncontrolling interest | 62 | 33
Tax Equity Investors | Copper Mountain Solar - Mesquite Solar |  |
Business Acquisition [Line Items] |  |
Noncontrolling interest | $ 126 | 71
Third Party | Texas Solar 4 |  |
Business Acquisition [Line Items] |  |
Noncontrolling interest |  | $ 7

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