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Permanent Retirement of San Onofre (Details) (USD $) |  |  | 1 Months Ended |  |  | 12 Months Ended |  | 0 Months Ended | 6 Months Ended | 7 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended | 6 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 Southern California Edison | Dec. 31, 2013 Southern California Edison | Dec. 31, 2012 Southern California Edison | Dec. 31, 2013 San Onofre [Member] | Aug. 31, 2013 San Onofre [Member] | Jun. 06, 2013 San Onofre [Member] Southern California Edison | Jun. 30, 2013 San Onofre [Member] Southern California Edison positions | Dec. 31, 2013 San Onofre [Member] Southern California Edison invoices | Dec. 31, 2013 San Onofre [Member] Southern California Edison invoices | Aug. 31, 2013 San Onofre [Member] Southern California Edison | May 31, 2013 San Onofre [Member] Southern California Edison | Dec. 31, 2013 San Onofre [Member] Mitsubishi Heavy Industries Ltd [Member] | Dec. 31, 2013 Supporting Ongoing Activities at the Site [Member] San Onofre [Member] Southern California Edison | Dec. 31, 2013 Replacement Steam Generators [Member] San Onofre [Member] Southern California Edison | Jun. 30, 2013 Decommissioning Plan [Member] San Onofre [Member] Southern California Edison positions | Dec. 31, 2013 Building, plant and equipment [Member] San Onofre [Member] Southern California Edison | Dec. 31, 2013 Estimated Losses on Disposal of Nuclear Fuel Inventory [Member] San Onofre [Member] Southern California Edison | Dec. 31, 2013 Regulatory Balancing Accounts, Liabilities San Onofre [Member] Southern California Edison | Dec. 31, 2013 Employee Severance San Onofre [Member] Southern California Edison | Dec. 31, 2013 Indirect Employee Severance Costs [Member] San Onofre [Member] Southern California Edison
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduced power level of operation (as a percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |
Term of reduced power level of operation (in months) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 months |  |  |  |  |  |  |  |
Allowed Refueling Outage Costs Proposed Decision |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,000,000 |  |  |  |  |  |  |  |
Disallowed Operation And Maintenance Costs Authorized in Rates |  |  |  |  |  |  |  |  |  |  |  |  |  | 74,000,000 |  |  |  |  |  |  |  |
Percentage Of Revenue Requirement |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Cumulative Regulated Operating Revenue |  |  |  |  |  |  |  |  |  | 1,250,000,000 | 1,250,000,000 |  |  |  |  |  |  |  |  |  |  |
Public Utilities Cost Of Service For Severance |  |  |  |  |  |  |  |  |  |  | 39,000,000 |  |  |  |  |  |  |  |  |  |  |
Decommissioning Nuclear Facilities Net Investment |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000,000 |  |  |  |  |  |  |  |  |
Authorized expenditures | 525,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized expenditures, after adjustments for inflation |  |  |  |  |  |  |  |  |  | 665,000,000 | 665,000,000 |  |  |  |  |  |  |  |  |  |  |
Ownership Interest |  |  |  |  |  |  |  |  |  | 78.21% | 78.21% |  |  |  |  |  |  |  |  |  |  |
Authorized expenditures by authoritative body, spent to date |  |  |  |  |  |  |  |  |  |  | 602,000,000 |  |  |  |  |  |  |  |  |  |  |
Authorized expenditures by authoritative body, market costs incurred |  |  |  |  |  |  |  | 680,000,000 |  | 333,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Authorized expenditures by authoritative body, Planned Outage Costs |  |  |  |  |  |  |  | 65,000,000 |  | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Incremental inspection and repair costs |  |  |  |  |  |  |  |  |  |  | 115,000,000 |  |  |  |  |  |  |  |  |  |  |
Incremental inspection and repair costs, payments from MHI |  |  |  |  |  |  |  |  |  |  | 36,000,000 |  |  |  |  |  |  |  |  |  |  |
Reclassification To Regulatory Assets Amount |  |  |  |  |  |  |  |  |  |  |  |  | 1,521,000,000 |  |  |  |  |  |  |  |  |
Regulatory assets | 7,241,000,000 | 6,422,000,000 |  | 7,241,000,000 | 6,422,000,000 |  |  |  |  |  |  |  |  |  | 404,000,000 |  |  |  |  |  |  |
Asset impairment and other charges |  |  |  |  |  |  |  |  | 575,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment net of tax |  |  |  |  |  |  |  |  | 365,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Number of Positions Eliminated |  |  |  |  |  |  |  |  | 960 |  |  |  |  |  |  |  | 175 |  |  |  |  |
Severance Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,000,000 | 14,000,000
Net Regulatory Assets |  |  |  |  |  |  |  |  |  | 1,300,000,000 | 1,300,000,000 |  |  |  |  |  |  | 1,560,000,000 | 33,000,000 | 266,000,000 |  |
Steam generators, warranted period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |
MHI's limited liability under purchase agreement, excluding consequential damages |  |  |  |  |  |  |  |  |  |  |  |  |  | 138,000,000 |  |  |  |  |  |  |  |
Notice of intent to sue, notice time period |  |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  | 98,000,000 |  |  |  |  |  |  |  | 4,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Loss Contingency Counter Claim Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,000,000 |  |  |  |  |  |  |  |
Number of invoices for reimbursement (in invoices) |  |  |  |  |  |  |  |  |  | 7 | 7 |  |  |  |  |  |  |  |  |  |  |
Invoiced amount to MHI |  |  |  |  |  |  |  |  |  | 149,000,000 | 149,000,000 |  |  |  |  |  |  |  |  |  |  |
Invoiced amount paid by MHI |  |  |  |  |  |  |  |  |  |  | 45,000,000 |  |  |  |  |  |  |  |  |  |  |
Notice Of Claim Amount |  |  |  |  |  |  | $ 397,000,000 |  |  |  |  | $ 311,000,000 |  |  |  |  |  |  |  |  |  |
Outage Policy Benefit Reduction Percentage |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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