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Acquisitions, Investments and Dispositions - Sempra Solar (Details) $ / shares in Units, $ in Millions |  | 11 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 13, 2018 USD ($) $ / shares MW | Dec. 12, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |
Business acquisition, pre-tax gain from interests in projects | $ 131 |  |  | $ 131
Long-term debt |  |  | $ 19,973 | $ 18,145
Sempra Solar |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Ownership percentage | 50.00% |  |  |
Renewable Electric Production Projects | Sempra Solar |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Project generating capacity (MW AC) | MW | 379 |  |  |
Sempra Solar |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition, pre-tax gain from interests in projects | $ 131 |  |  |
Business acquisition, after-tax gain from interests in projects | $ 89 |  |  |
Business acquisition, after-tax gain from interests in projects, per share (in dollars per share) | $ / shares | $ 0.28 |  |  |
Con Edison Development | Sempra Solar |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price | $ 1,609 |  |  |
Working capital and other closing adjustments | 69 |  |  |
Reclassification adjustment to property, plant and equipment and asset retirement obligations |  |  | $ 100 |
Period available to finalize purchase price allocation |  |  | 1 year |
Acquisition-date fair value of ownership interest held | 568 | $ 437 |  |
Property, plant and equipment acquired | 1,354 |  |  |
Intangible assets acquired | 878 |  |  |
Noncurrent assets | $ 4 |  |  |
Weighted average amortization period for intangible assets | 16 years |  |  |
Fair value of noncontrolling interest attributable to tax equity investors | $ 100 |  |  |
Sempra Solar | Renewable Electric Production Projects |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Project generating capacity (MW AC) | MW | 981 |  |  |
Long-term debt | $ 568 |  |  |
Asset retirement obligation | $ 28 |  |  |

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