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Investments Accounted for by the Equity Method and Variable Interest Entities - Consolidated Entities (Details) - USD ($) $ in Millions | Sep. 30, 2020 | May 29, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Other current and non-current assets | $ 2,787 |  | $ 3,029
Property, plant and equipment | 6,165 |  | 6,063
Intangible assets | 1,371 |  | 1,428
Total Assets | 9,725 |  | 9,700
Total Liabilities | 7,488 |  | $ 7,437
Oahu Solar Partnership |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other current and non-current assets | 25 |  |
Property, plant and equipment | 182 |  |
Intangible assets | 0 |  |
Total Assets | 207 |  |
Total Liabilities | 125 |  |
Noncontrolling interest | 25 |  |
Net assets less noncontrolling interests | 57 |  |
Kawailoa Partnership |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other current and non-current assets | 24 |  |
Property, plant and equipment | 142 |  |
Intangible assets | 0 |  |
Total Assets | 166 |  |
Total Liabilities | 116 |  |
Noncontrolling interest | 35 |  |
Net assets less noncontrolling interests | 15 |  |
Elbow Creek TE Holdco |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other current and non-current assets | 10 |  |
Property, plant and equipment | 102 |  |
Intangible assets | 1 |  |
Total Assets | 113 |  |
Total Liabilities | 27 |  |
Noncontrolling interest | 74 |  |
Net assets less noncontrolling interests | 12 |  |
Wildorado TE Holdco |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other current and non-current assets | 16 |  |
Property, plant and equipment | 244 |  |
Intangible assets | 0 |  |
Total Assets | 260 |  |
Total Liabilities | 12 |  |
Noncontrolling interest | 107 |  |
Net assets less noncontrolling interests | 141 |  |
DGPV Holdco 3 |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other current and non-current assets | 61 |  |
Property, plant and equipment | 329 | $ 331 |
Intangible assets | 1 | 1 |
Total Assets | 391 | 401 |
Total Liabilities | 276 | 290 |
Noncontrolling interest | 3 | 6 |
Net assets less noncontrolling interests | 112 | $ 105 |
Alta TE Holdco |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other current and non-current assets | 58 |  |
Property, plant and equipment | 363 |  |
Intangible assets | 228 |  |
Total Assets | 649 |  |
Total Liabilities | 44 |  |
Noncontrolling interest | 38 |  |
Net assets less noncontrolling interests | 567 |  |
Spring Canyon |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other current and non-current assets | 3 |  |
Property, plant and equipment | 82 |  |
Intangible assets | 0 |  |
Total Assets | 85 |  |
Total Liabilities | 5 |  |
Noncontrolling interest | 29 |  |
Net assets less noncontrolling interests | 51 |  |
Buckthorn Renewables LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other current and non-current assets | 3 |  |
Property, plant and equipment | 209 |  |
Intangible assets | 0 |  |
Total Assets | 212 |  |
Total Liabilities | 7 |  |
Noncontrolling interest | 62 |  |
Net assets less noncontrolling interests | 143 |  |
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other current and non-current assets | 5 |  |
Property, plant and equipment | 8 |  |
Intangible assets | 0 |  |
Total Assets | 13 |  |
Total Liabilities | 3 |  |
Noncontrolling interest | 0 |  |
Net assets less noncontrolling interests | $ 10 |  |

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