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Summary of Significant Accounting Policies and Other Matters - Long-Lived and Intangible Assets (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated amortization | $ 228,000,000 | $ 126,000,000 |
Amortization of intangible assets | 102,000,000 | 99,000,000 | $ 14,000,000
Amortization expense, 2020 | 102,000,000 |  |
Amortization expense, 2021 | 102,000,000 |  |
Amortization expense, 2022 | 102,000,000 |  |
Amortization expense, 2023 | 102,000,000 |  |
Amortization expense, 2024 | 102,000,000 |  |
Impairment charges | 0 | 0 | $ 2,000,000
Net non-utility plant | 46,555,000,000 | 43,889,000,000 |
Intangible assets | 1,460,000,000 | 1,557,000,000 |
Long-term debt | 22,349,000,000 | 19,973,000,000 |
Other Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, net | 3,000,000 |  |
Accumulated amortization | 8,000,000 | 7,000,000 |
Power Purchase Agreements |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, net | 1,457,000,000 | 1,554,000,000 |
Accumulated amortization | $ 220,000,000 | $ 119,000,000 |

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