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Summary of Significant Accounting Policies (Regulatory Proceedings) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 12, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019
CPUC | Pro forma |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Proposed decision escalate capital additions, year two percent |  |  |  |  | 2.49%
CPUC | Subsequent event | Pro forma |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Requested revenue requirement year one |  | $ (5,422) |  |  |
Impact of proposed decision non-core impairment of utility property, plant and equipment |  | 257 |  |  |
Impact of proposed decision non-core impairment of utility property, plant and equipment, net of tax |  | 185 |  |  |
Impact of proposed decision non-core impairment of utility core earnings, net of tax |  | $ 130 |  |  |
Proposed decision escalate capital additions, year one, percent |  | 2.49% |  |  |
Requested revenue requirement year two |  | $ (5,823) |  |  |
Southern California Edison |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Requested revenue requirement year one |  |  |  | $ 5,534 |
Increase (decrease) in revenue requirement |  |  |  | $ (106) |
Current effective retail base transmission revenue requirement |  |  | $ 1,000 |  |
Southern California Edison | Subsequent event | Forecast |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Increase (decrease) in revenue requirement | $ 290 |  |  |  |
Southern California Edison | CPUC | Subsequent event |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Requested revenue requirement year one |  | 5,102 |  |  |
Increase (decrease) in revenue requirement |  | $ (432) |  |  |
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 |  |  |  | 10.30% |
Southern California Edison | FERC | Subsequent event | Forecast |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
FERC Base ROE |  | 17.12% |  |  |
Conventional ROE |  | 11.12% |  |  |
Additional ROE |  | 6.00% |  |  |
Effective term |  | 60 days |  |  |
Suspension term |  | 5 months |  |  |
Southern California Edison | CAISO | Subsequent event | Forecast |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Additional ROE |  | 0.50% |  |  |
Southern California Edison | FERC and CAISO | Subsequent event | Forecast |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
FERC Base ROE |  | 18.40% |  |  |

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