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Commitments and Contingencies (Contingencies Textual) (Details) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended
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Jun. 30, 2010 | Dec. 31, 2013 Nuclear Insurance | Dec. 31, 2013 Edison International sites | Dec. 31, 2011 Southern California Edison | Jun. 30, 2010 Southern California Edison | Dec. 31, 2013 Southern California Edison sites | Dec. 31, 2012 Southern California Edison | Dec. 31, 2011 Southern California Edison | Oct. 31, 2011 Southern California Edison Alleged violations of PSD requirements and New Source Performance Standards of the CAA plaintiffs | Dec. 31, 2013 Southern California Edison Nuclear Insurance | Dec. 31, 2013 SCE and other owners of San Onofre and Palo Verde Nuclear Insurance | Aug. 31, 2013 San Onofre (nuclear) | Dec. 31, 2013 San Onofre (nuclear) Southern California Edison | Aug. 31, 2013 San Onofre (nuclear) Southern California Edison | Dec. 31, 2013 San Onofre and Palo Verde SCE and other owners of San Onofre and Palo Verde Nuclear Insurance | Dec. 31, 2013 Dividends Paid By EME to Holdings [Member] Eme Chapter 11 Bankruptcy Filing [Member] | Dec. 31, 2013 Amount Paid By EME Under Tax Allocation Scheme [Member] Eme Chapter 11 Bankruptcy Filing [Member] | Jun. 30, 2010 Amount Returned To Customers [Member] Southern California Edison | Jun. 30, 2010 Amount Returned To Shareholders [Member] Southern California Edison
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notice Of Claim Amount |  |  |  |  |  |  |  |  |  |  |  | $ 397,000,000 |  | $ 311,000,000 |  | $ 925,000,000 | $ 183,000,000 |  |
Number of plaintiffs (entities) |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Identified material sites for environmental remediation (in number of sites) |  |  | 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum costs to be Identified Site |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Immaterial sites for environmental remediation (in number of sites) |  |  |  |  |  | 39 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum liability for environmental remediation for material sites |  |  |  |  |  | 110,000,000 |  |  |  |  |  |  | 73,000,000 |  |  |  |  |  |
Immaterial sites, range of liability, minimum |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation liability |  |  |  |  |  | 114,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets related to environmental remediation |  |  |  |  |  | 110,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of recorded liability recoverable from incentive mechanism |  |  |  |  |  | 36,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of environmental remediation costs recoverable through an incentive mechanism (as a percent) |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation costs to be recovered (as a percent) |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Liability incurred at majority of the remaining sites through customer rates |  |  |  |  |  | 74,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount that cleanup costs could exceed recorded liability for identified material sites |  |  |  |  |  | 162,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount that cleanup costs could exceed recorded liability for immaterial sites |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 27,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation costs |  |  |  |  |  | 8,000,000 | 10,000,000 | 16,000,000 |  |  |  |  |  |  |  |  |  |  |
Federal limit on public liability claims from nuclear incident, approximate |  | 13,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private primary insurance purchased |  |  |  |  |  |  |  |  |  |  | 375,000,000 |  |  |  |  |  |  |  |
Maximum assessment per each nuclear incident |  |  |  |  |  |  |  |  |  | 255,000,000 |  |  |  |  |  |  |  |  |
Maximum yearly assessment per nuclear incident |  |  |  |  |  |  |  |  |  | 38,000,000 |  |  |  |  |  |  |  |  |
Loss limit, property damage insurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000 |  |  |  |
Loss limit, property damage insurance, federal minimum requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,060,000,000 |  |  |  |
Limit on assessment of retrospective premium adjustments, per year, approximate |  |  |  |  |  |  |  |  |  | 52,000,000 |  |  |  |  |  |  |  |  |
Insurance coverage for wildfire liabilities Limit |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Self insurance retention per wildfire occurrence |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance Coverage For Wildfires Additional Limit |  |  |  |  |  | 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Wildfire Threshold For Additional Coverage |  |  |  |  |  | 550,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of damages, decision by US Court of Federal Claims, spent nuclear fuel litigation | 142,000,000 |  |  |  | 112,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 94,000,000 | 18,000,000
Damages sought |  |  |  | $ 98,000,000 |  |  |  |  |  |  |  |  | $ 4,000,000,000 |  |  |  |  |  |

X
- Definition The amount of damages in decision by United States Court of Federal Claims, subject to appeal, regarding spent nuclear fuel. + References No definition available. + Details
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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 The high end of the range of expected remediation costs in each of the next several years. + References No definition available. + Details
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- Definition The low end of the range of expected remediation costs in each of the next several years. + References No definition available. + Details
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- Definition The approximate maximum amount of public liability, as limited by federal law, resulting from a nuclear incident. + 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 This element represents the insurance coverage limit for wildfire liabilities. + References No definition available. + Details
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- Definition Insurance Coverage For Wildfires Additional Limit + References No definition available. + Details
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- Definition The approximate maximum yearly retrospective premium adjustments that could be assessed against the entity. + References No definition available. + Details
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- Definition The amount of losses covered under primary insurance for property damage and decontamination costs. + References No definition available. + Details
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- Definition Loss Limit, Property Damage Insurance, Federal Minimum Requirement + 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 Maximum Expected Period for Clean Up of Identified Sites + References No definition available. + Details
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- Definition The maximum amount of additional insurance premium per yearly assessment charged for each nuclear incident. + 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 Notice Of Claim Amount + 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 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 Wildfire Threshold For Additional Coverage + 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 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: 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=25496072&loc=d3e14326-108349 Reference 3: 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 + Details
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- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 24 -Article 5 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 FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 + Details
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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: 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=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
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- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
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