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Commitments and Contingencies (MHI Claims) (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2013 USD ($) invoice | Oct. 31, 2013 USD ($) | Jun. 30, 2010 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2012 USD ($)
SCE |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Damages sought |  |  | $ 112,000,000 |  |
SCE | San Onofre | Mitsubishi Heavy Industries Ltd |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Invoices for reimbursement (number) | invoice | 7 |  |  |  |
Invoices for repair costs | $ 149,000,000 |  |  |  |
Invoice paid for repair costs | $ 45,000,000 |  |  |  |
SCE portion of invoice paid for repair costs |  |  |  |  | $ 35,000,000
SCE | San Onofre | Mitsubishi Heavy Industries Ltd | Minimum |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Damages sought |  | $ 4,000,000,000 |  |  |
SCE | San Onofre | Mitsubishi Heavy Industries Ltd |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Allocated to customer (percent) |  |  |  | 50.00% |
SCE allocation (percent) |  |  |  | 50.00% |
Customers' portion of recoveries |  |  |  | $ 282,000,000 |
SCE | San Onofre | Replacement Steam Generators |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Warranty period |  |  |  | 20 years |
Mitsubishi Heavy Industries Ltd | San Onofre |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Stated liability under the purchase agreement |  |  |  | $ 138,000,000 |
Asserted counter claim |  | $ 41,000,000 |  |  |

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