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Summary of Significant Accounting Policies (Regulatory Proceedings) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 31, 2019 | Apr. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
CPUC | 2018 GRC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Approved decision escalate capital additions, year two, percent | 2.49% |  |  |  |
Southern California Edison |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  | $ 290 |
Current effective retail base transmission revenue requirement |  |  |  | 1,040 |
Southern California Edison | CPUC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Additional ROE |  | 6.00% |  |  |
Southern California Edison | CPUC | 2018 GRC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Approved revenue requirement year one | $ 5,451 |  |  |  |
Approved decision escalate capital additions, year one, percent | 2.49% |  |  |  |
Approved revenue requirement year two | $ 5,863 |  |  |  |
Impact of decision non-core impairment of utility core earnings, net of tax |  |  | $ 131 |  |
Reduction in revenue |  |  | (265) |  |
Reduction in authorized revenue | $ 5,116 |  | (289) |  |
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 |  |
Southern California Edison | FERC |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  | $ (131) |
Decrease in revenue requirement percent |  |  |  | 11.00% |
FERC Base ROE |  | 17.12% |  |  | 10.30%
Conventional ROE |  | 11.12% |  |  |
Additional ROE |  | 6.00% |  |  |
Southern California Edison | CAISO |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Additional ROE |  | 0.50% |  |  |
Southern California Edison | FERC and CAISO |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
FERC Base ROE |  | 18.40% |  |  |

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