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Summary of Significant Accounting Policies (Regulatory Proceedings) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | May 31, 2019 | Apr. 30, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  | $ 502.0 |  |  | $ 544.0 |  |  | $ 1,232.0 | $ 1,084.0
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] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  | $ 534.0 | $ 449.0 | $ 323.0 | $ 567.0 | $ 327.0 | $ 316.0 | 1,306.0 | $ 1,210.0
Southern California Edison | CPUC | 2018 GRC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction in authorized revenue |  | $ 5,116.0 |  |  | 289.0 |  |  |  |  |  |
Approved decision escalate capital additions, year one, percent |  | 2.49% |  |  |  |  |  |  |  |  |
Approved revenue requirement year one |  | $ 5,451.0 |  |  |  |  |  |  |  |  |
Approved revenue requirement year two |  | $ 5,863.0 |  |  |  |  |  |  |  |  |
Impact of decision non-core impairment of utility core earnings, net of tax |  |  |  |  | 131.0 |  |  |  |  |  |
Reduction in revenue |  |  |  |  | 265.0 |  |  |  |  |  |
Increase in approved revenue |  |  |  |  | 24.0 |  |  |  |  |  |
Refund to customers |  |  |  |  | 554.0 |  |  |  |  |  |
Impact of decision non-core impairment of utility property, plant and equipment |  |  |  |  | 170.0 |  |  |  |  |  |
Impact of decision non-core impairment of utility property, plant and equipment, net of tax |  |  |  |  | $ 123.0 |  |  |  |  |  |
Southern California Edison | FERC |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  |  |  |  |  |  | $ (131.0) |
Decrease in revenue requirement percent |  |  |  |  |  |  |  |  |  | 11.00% |
ROE | 17.12% |  |  |  |  |  |  |  |  |  |
Amended ROE | 0.85% |  | 6.00% |  |  |  |  |  |  |  |
Conventional ROE | 11.12% |  |  |  |  |  |  |  |  |  |
Southern California Edison | FERC | FERC 2018 Settlement Period |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
ROE | 10.70% |  |  |  |  |  |  |  |  |  |
Amended ROE | 11.58% |  |  |  |  |  |  |  |  |  |
Net income | $ 48.4 |  |  |  |  |  |  |  |  |  |
Southern California Edison | FERC | 2019 Formula Rate case |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
ROE |  |  | 17.12% |  |  |  |  |  |  |  |
Amended ROE |  |  | 6.00% |  |  |  |  |  |  |  |
Conventional ROE |  |  | 11.12% |  |  |  |  |  |  |  |
Southern California Edison | FERC | 2018 Formula Rate case |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
ROE |  |  | 11.20% |  |  |  |  |  |  |  |
Southern California Edison | FERC | April 2019 formula rate partial settlement |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
ROE | 11.97% |  |  |  |  |  |  |  |  |  |
Southern California Edison | CAISO |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amended ROE | 0.50% |  |  |  |  |  |  |  |  |  |
Southern California Edison | CAISO | FERC 2018 Settlement Period |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amended ROE | 0.50% |  |  |  |  |  |  |  |  |  |
Southern California Edison | CAISO | 2019 Formula Rate case |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amended ROE |  |  | 0.50% |  |  |  |  |  |  |  |
Southern California Edison | FERC and CAISO |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
ROE | 13.25% |  |  |  |  |  |  |  |  |  |
Southern California Edison | FERC and CAISO | FERC 2018 Settlement Period |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
ROE | 11.20% |  |  |  |  |  |  |  |  |  |
Southern California Edison | FERC and CAISO | 2019 Formula Rate case |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
ROE |  |  | 18.40% |  |  |  |  |  |  |  |

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