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Commitments and Contingencies (Details) (USD $) | 1 Months Ended | 3 Months Ended |  |  | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended
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Jun. 30, 2010 | Dec. 31, 2011 Southern California Edison | Mar. 31, 2013 Southern California Edison sites | Mar. 31, 2012 Southern California Edison | Sep. 15, 2012 Southern California Edison | Mar. 31, 2013 Southern California Edison Environmental Indemnities | Mar. 31, 2013 Edison International sites | Oct. 31, 2011 Alleged violations of PSD requirements and New Source Performance Standards of the CAA Southern California Edison private_environmental_organization | Mar. 31, 2013 Nuclear Insurance | Mar. 31, 2013 Nuclear Insurance Southern California Edison | Mar. 31, 2013 Nuclear Insurance SCE and other owners of San Onofre and Palo Verde | Oct. 31, 2011 Pending Litigation Malibu Fire Order Instituting Investigation | Dec. 31, 2007 Pending Litigation Malibu Fire Order Instituting Investigation power_pole | Oct. 30, 2011 Pending Litigation Malibu Fire Order Instituting Investigation Southern California Edison | Mar. 31, 2013 San Onofre (nuclear) Southern California Edison | Mar. 31, 2013 San Onofre (nuclear) Outage, Inspection and Repair Issues | Mar. 31, 2013 San Onofre (nuclear) Outage, Inspection and Repair Issues Southern California Edison invoices | Oct. 31, 2012 San Onofre (nuclear) Outage, Inspection and Repair Issues Southern California Edison | Dec. 31, 2005 San Onofre (nuclear) Outage, Inspection and Repair Issues Southern California Edison | Mar. 31, 2013 San Onofre and Palo Verde Nuclear Insurance Southern California Edison
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum liability for purchase agreement for damages |  |  |  |  |  | $ 60,000,000 |  |  |  |  |  |  |  |  |  |  | $ 138,000,000 |  |  |
Reduced power level of operation (as a percentage) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00% |  |
Term of reduced power level of operation (in months) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 months |  |
Consecutive period of outage (months) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 months |  |  |
Steam generators, warranted period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |
Number of invoices for reimbursement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |
Invoiced amount to MHI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 139,000,000 |  |  |
Invoiced amount paid by MHI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,000,000 |  |  |
Damages sought |  | 98,000,000 |  |  |  |  |  |  |  |  |  | 99,000,000 |  | 50,000,000 |  | 234,000,000 | 183,000,000 |  |  |
Authorized expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 728,000,000 |  | 525,000,000 |
Authorized expenditures, after adjustments for inflation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 665,000,000 |
Ownership percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78.21% |  |  |
Costs incurred to date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 602,000,000 |  |  |
Authorized expenditures by authoritative body, planned outage costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 444,000,000 |  |  |
Authorized expenditures by authoritative body, planned outage costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |
Incremental inspection and repair costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109,000,000 |  |  |
Incremental inspection and repair costs, payments from MHI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,000,000 |  |  |
Number of failed power poles (in power poles) |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Number of plaintiffs (entities) |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Identified material sites for environmental remediation (in number of sites) |  |  |  |  |  |  | 23 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum costs to be Identified Site |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum liability for environmental remediation for material sites |  |  | 124,000,000 |  |  |  |  |  |  |  |  |  |  |  | 91,000,000 |  |  |  |  |
Immaterial sites for environmental remediation (in number of sites) |  |  | 35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Immaterial sites, range of liability, minimum |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation liability |  |  | 127,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets related to environmental remediation |  |  | 123,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of recorded liability recoverable from incentive mechanism |  |  | 31,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of environmental remediation costs recoverable through an incentive mechanism (as a percent) |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability incurred at majority of the remaining sites through customer rates |  |  | 92,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation costs to be recovered (as a percent) |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount that cleanup costs could exceed recorded liability for identified material sites |  |  | 180,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount that cleanup costs could exceed recorded liability for immaterial sites |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum expected period for cleanup of identified sites (in years) |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected annual environmental remediation costs, low end of range |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected annual environmental remediation costs, high end of range |  |  | 28,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation costs |  |  | 2,000,000 | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal limit on public liability claims from nuclear incident, approximate |  |  |  |  |  |  |  |  | 12,600,000,000 |  |  |  |  |  |  |  |  |  |  |
Private primary insurance purchased |  |  |  |  |  |  |  |  |  |  | 375,000,000 |  |  |  |  |  |  |  |  |
Maximum assessment per each nuclear incident |  |  |  |  |  |  |  |  |  | 235,000,000 |  |  |  |  |  |  |  |  |  |
Maximum yearly assessment per nuclear incident |  |  |  |  |  |  |  |  |  | 35,000,000 |  |  |  |  |  |  |  |  |  |
Loss limit, property damage insurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000
Loss limit, property damage insurance, federal minimum requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000,000
Limit on assessment of retrospective premium adjustments, per year, approximate |  |  |  |  |  |  |  |  |  | 52,000,000 |  |  |  |  |  |  |  |  |  |
Insurance coverage for wildfire liabilities Limit |  |  |  |  | 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self insurance retention per wildfire occurrence |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of damages, decision by US Court of Federal Claims, spent nuclear fuel litigation | $ 142,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The potential estimated cleanup costs for identified material sites in excess of the minimum liability that is accrued as of the balance sheet date for environmental loss contingencies. + References No definition available. + Details
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- Definition The potential estimated cleanup costs for immaterial sites in excess of the minimum liability that is accrued as of the balance sheet date for environmental loss contingencies. + References No definition available. + Details
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- Definition This element represents the increase in self insurance retention per wildfire occurrence. + References No definition available. + Details
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- Definition The maximum amount of deferred insurance premium based on each nuclear incident occurring. + References No definition available. + Details
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- Definition The upper end of the range of a site's cost estimate must be at least this amount to be classified as a material identified site. Below this amount an identified site will be an immaterial site. + References No definition available. + Details
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- Definition Number of Failed Power Poles + References No definition available. + Details
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- Definition The number of immaterial identified sites which have a recorded environmental remediation liability as the costs can be estimated and are probable. + References No definition available. + Details
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- Definition The number of material identified sites which have a recorded environmental remediation liability as the costs can be estimated and are probable. + References No definition available. + Details
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- Definition The percentage of environmental remediation costs entity will recover through incentive mechanism. + References No definition available. + Details
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- Definition Represents the percentage of environmental remediation costs to be recovered. + References No definition available. + Details
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- Definition The portion of the recorded liability for environmental remediation costs recoverable through incentive mechanism. + References No definition available. + Details
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- Definition The maximum amount of private primary insurance available, which was purchased. + References No definition available. + Details
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- Definition Public Utilities, Incremental Inspection and Repair Costs + References No definition available. + Details
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- Definition Public Utilities, Incremental Inspection and Repair Costs, Payments from Third Party + References No definition available. + Details
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- Definition Public Utilities, Reduced Power Level + References No definition available. + Details
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- Definition Public Utilities, Reduced Power Level, Term of Reduction + References No definition available. + Details
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- Definition Public Utilities, Required Notification, Consecutive Period of Outage + References No definition available. + Details
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- Definition Represents the recorded liability incurred at majority of the remaining sites through customer rates. + References No definition available. + Details
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- Definition Regulatory Assets, Noncurrent, Environmental Remediation + References No definition available. + Details
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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 96-1 -Paragraph 161 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 + Details
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