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Commitments and Contingencies (San Onofre CPUC Proceedings) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 19, 2017
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets | $ 4,914.0 | $ 7,455.0 |  |
Impairment and other charges | 738.0 | 21.0 | $ 5.0 |
SCE |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets | 4,914.0 | 7,455.0 |  |
Impairment and other charges | 716.0 | 0.0 | $ 0.0 |
SCE | Utility Shareholder Agreement |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Impairment and other charges | 143.0 |  |  |
SCE | San Onofre |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets | 72.0 | $ 857.0 |  | $ 775.0
The Utilities |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Funding commitment for GHG Reduction Program | 25.0 |  |  |
Funding obligation reduction | $ 12.5 |  |  |
SDG&E | San Onofre |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Regulatory assets |  |  |  | $ 151.0

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