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v3.19.3.a.u2

Summary of Significant Accounting Policies and Other Matters - Long-Lived and Intangible Assets (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) MW | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated amortization | $ 126,000,000 | $ 29,000,000 |
Amortization of intangible assets | 99,000,000 | 14,000,000 | $ 9,000,000
Amortization expense, 2020 | 100,000,000 |  |
Amortization expense, 2021 | 105,000,000 |  |
Amortization expense, 2022 | 105,000,000 |  |
Amortization expense, 2023 | 105,000,000 |  |
Amortization expense, 2024 | 105,000,000 |  |
Asset impairment | 2,000,000 |  |
Impairment charges on long-lived assets |  | 0 | 0
Impairment charges on intangible assets |  | 0 | $ 0
Net non-utility plant | 43,889,000,000 | 41,749,000,000 |
Intangible assets | 1,557,000,000 | 1,654,000,000 |
Long-term debt | 19,973,000,000 | 18,145,000,000 |
PG&E Project |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Net non-utility plant | 819,000,000 | 885,000,000 |
Intangible assets | 1,057,000,000 | 1,125,000,000 |
Long-term debt | $ 1,001,000,000 | 1,050,000,000 |
PG&E Project | Con Edison Development |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Aggregate power to be sold (in MW) | MW | 680 |  |
PG&E Project | Secured Related to Project Debt |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Net non-utility plant | $ 282,000,000 | 292,000,000 |
Other Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, net | 3,000,000 |  |
Accumulated amortization |  | 7,000,000 |
Power Purchase Agreements |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, net | 1,554,000,000 | 1,651,000,000 |
Accumulated amortization | $ 119,000,000 | $ 22,000,000 |

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