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Permanent Retirement of San Onofre (Details) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 6 Months Ended |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 6 Months Ended |  | 6 Months Ended
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Apr. 30, 2013 invoices | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Apr. 27, 2013 | Dec. 31, 2012 | Jun. 30, 2013 San Onofre (nuclear) | Jun. 30, 2013 Southern California Edison | Apr. 27, 2013 Southern California Edison | Dec. 31, 2012 Southern California Edison | Jun. 30, 2013 Southern California Edison San Onofre (nuclear) | Jun. 30, 2013 Southern California Edison San Onofre (nuclear) | Jun. 30, 2013 Southern California Edison San Onofre (nuclear) positions | May 31, 2013 Southern California Edison San Onofre (nuclear) | Jun. 30, 2013 Mitsubishi Heavy Industries Ltd [Member] San Onofre (nuclear) | Jun. 30, 2013 Replacement Steam Generators Southern California Edison San Onofre (nuclear) | Jun. 30, 2013 Supporting Ongoing Activities at the Site Southern California Edison San Onofre (nuclear) | Jun. 30, 2013 Employee severance Southern California Edison San Onofre (nuclear) | Jun. 30, 2013 Decommissioning Plan Southern California Edison San Onofre (nuclear) positions
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative amount of revenue collected since January 1, 2012 |  |  |  |  |  |  |  |  |  |  |  | $ 860,000,000 | $ 860,000,000 | $ 860,000,000 |  |  |  |  |  |
Cost of service |  |  |  |  |  |  |  |  |  |  |  | 56,000,000 |  |  |  |  |  |  |  |
Decommissioning Nuclear Facilities Net Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000,000 |  |  |  |  |
Authorized expenditures by authoritative body |  |  |  |  |  |  |  |  |  |  |  | 525,000,000 | 525,000,000 | 525,000,000 |  |  |  |  |  |
Authorized expenditures by authoritative body, after adjustments for inflation |  |  |  |  |  |  |  |  |  |  |  | 665,000,000 | 665,000,000 | 665,000,000 |  |  |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  |  |  |  |  |  |  |  |  |  |  | 78.21% | 78.21% | 78.21% |  |  |  |  |  |
Authorized expenditures by authoritative body, spent to date |  |  |  |  |  |  |  |  |  |  |  |  |  | 602,000,000 |  |  |  |  |  |
Authorized expenditures by authoritative body, market costs incurred |  |  |  |  |  |  |  |  |  |  |  |  |  | 670,000,000 |  |  |  |  |  |
Avoided Nuclear Costs Due To Decision To Retire Plant |  |  |  |  |  |  |  |  |  |  |  |  |  | 138,000,000 |  |  |  |  |  |
Authorized expenditures by authoritative body, Planned Outage Costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,000,000 |  |  |  |  |  |
Public Utilities, Incremental Inspection and Repair Costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 115,000,000 |  |  |  |  |  |
Public Utilities, Incremental Inspection and Repair Costs, Payments from Third Party |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,000,000 |  |  |  |  |  |
Amount of assets reclassified to a regulatory asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,521,000,000 |  |  |  |  |
Regulatory assets |  | 7,494,000,000 |  | 7,494,000,000 |  |  | 6,422,000,000 |  | 7,494,000,000 |  | 6,422,000,000 |  |  |  |  |  |  | 404,000,000 |  |
Asset impairment and other |  | 575,000,000 | (1,000,000) | 575,000,000 | 0 |  |  |  |  |  |  |  | 575,000,000 |  |  |  |  |  |  |
Asset impairment net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 365,000,000 |  |  |  |  |  |  |
San Onofre expected number of positions to be eliminated |  |  |  |  |  |  |  |  |  |  |  |  |  | 960 |  |  |  |  |  | 175
Disposal Group, Including Discontinued Operation, Accrued Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 56,000,000 |
Increase in regulatory assets |  |  |  |  |  |  |  |  |  |  |  | 32,000,000 |  |  |  |  |  |  |  |
Warranty Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |
Maximum liability for purchase agreement for damages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 138,000,000 |  |  |  |
Notice of intent to sue, notice time period |  |  |  |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |  |  |  |
Number of Invoices for Reimbursement | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain Contingency, Invoiced Amount for Reimbursement | 149,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain Contingency, Invoiced Amount Paid for Reimbursement | 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notice Of Claim Amount |  |  |  |  |  | $ 352,000,000 |  |  |  | $ 276,000,000 |  |  |  |  |  |  |  |  |  |
Outage Policy Benefit Reduction Percentage |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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