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Summary of Significant Accounting Policies (Revenue Recognition) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | $ 1,405 | $ (316) | $ 668
SCE |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Franchise fees billed to customers |  |  |  |  |  |  |  |  |  | $ 122 | 133 | 133
Rate recovery period |  |  |  |  |  |  |  |  |  | 24 months |  |
Net income (loss) |  | $ 224 | $ 534 | $ 449 | $ 323 | $ (1,399) | $ 567 | $ 327 | $ 316 | $ 1,530 | $ (189) | $ 1,136
California Public Utilities Commission | General Rate Case, 2018 | SCE |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reduction in authorized revenue | $ 5,100 |  |  | 289 |  |  |  |  |  |  |  |
Approved decision escalate capital additions, year one, percent | 2.49% |  |  |  |  |  |  |  |  |  |  |
Approved revenue requirement year one | $ 5,500 |  |  |  |  |  |  |  |  |  |  |
Approved revenue requirement year two | $ 5,900 |  |  |  |  |  |  |  |  |  |  |
Impact of decision non-core impairment of utility core earnings, net of tax |  |  |  | 131 |  |  |  |  |  |  |  |
Reduction in revenue |  |  |  | 265 |  |  |  |  |  |  |  |
Increase in approved revenue |  |  |  | 24 |  |  |  |  |  |  |  |
Refund to customers |  |  |  | 554 |  |  |  |  |  |  |  |
Impact of decision non-core impairment of utility property, plant and equipment |  |  |  | 170 |  |  |  |  |  |  |  |
Impact of decision non-core impairment of utility property, plant and equipment, net of tax |  |  |  | $ 123 |  |  |  |  |  |  |  |
FERC | FERC 2018 Settlement Period | SCE |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | $ 29 |  |

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