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Variable Interest Entities - Net Assets (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Noncontrolling interest | $ 175 | $ 113
Great Valley Solar |  |
Variable Interest Entity [Line Items] |  |
Restricted cash | 0 | 0
Non-utility property, less accumulated depreciation | 295 | 313
Other assets | 47 | 18
Total assets | 342 | 331
Long-term debt due within one year | 0 | 0
Other liabilities | 19 | 17
Long-term debt | 0 | 0
Total liabilities | 19 | 17
Accumulated depreciation | 7 | 1
Great Valley Solar | Tax Equity Investors |  |
Variable Interest Entity [Line Items] |  |
Noncontrolling interest | 57 | 33
Copper Mountain - Mesquite Solar |  |
Variable Interest Entity [Line Items] |  |
Restricted cash | 0 | 0
Non-utility property, less accumulated depreciation | 465 | 492
Other assets | 131 | 97
Total assets | 596 | 589
Long-term debt due within one year | 0 | 0
Other liabilities | 22 | 33
Long-term debt | 0 | 0
Total liabilities | 22 | 33
Accumulated depreciation | 10 | 1
Copper Mountain - Mesquite Solar | Tax Equity Investors |  |
Variable Interest Entity [Line Items] |  |
Noncontrolling interest | $ 115 | 71
Texas Solar 4 |  |
Variable Interest Entity [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
Texas Solar 4 | Third Party |  |
Variable Interest Entity [Line Items] |  |
Noncontrolling interest |  | $ 7

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