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Commitments and Contingencies (Details) (USD $) | 1 Months Ended | 9 Months Ended |  |  | 1 Months Ended | 9 Months Ended |  | 9 Months Ended | 1 Months Ended
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Jun. 30, 2010 | Sep. 30, 2014 Southern California Edison site | Feb. 28, 2014 Southern California Edison | Dec. 31, 2011 Southern California Edison | Jun. 30, 2010 Southern California Edison | Sep. 30, 2014 Southern California Edison site | Sep. 30, 2013 Southern California Edison | Jun. 01, 2014 Southern California Edison | Feb. 28, 2014 San Gabriel Windstorm Investigation Southern California Edison | Oct. 31, 2011 Alleged violations of PSD requirements and New Source Performance Standards of the CAA Southern California Edison plaintiff | Sep. 30, 2014 Nuclear Insurance | Sep. 30, 2014 Nuclear Insurance Southern California Edison | Sep. 30, 2014 Nuclear Insurance SCE and other owners of San Onofre and Palo Verde | Sep. 30, 2014 Tort claims for onsite workers SCE and other owners of San Onofre and Palo Verde | Sep. 30, 2014 San Onofre (nuclear) Southern California Edison | Jun. 28, 2014 San Onofre (nuclear) Nuclear Insurance | Jun. 28, 2014 San Onofre (nuclear) Nuclear Insurance Southern California Edison | Sep. 30, 2014 San Onofre and Palo Verde Nuclear Insurance SCE and other owners of San Onofre and Palo Verde | Dec. 31, 2013 Amount Returned To Customers [Member] Southern California Edison | Dec. 31, 2013 Amount Returned To Shareholders [Member] Southern California Edison
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
San Bernardino settlement amount |  |  |  |  |  |  |  |  | $ 24,500,000 |  |  |  |  |  |  | $ 427,000,000 | $ 334,000,000 |  |  |
Litigation Settlement Penalties Paid to State |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs in Four Corners environmental matters |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Identified material sites for environmental remediation (in number of sites) |  | 20 |  |  |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum costs to be Identified Site |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum liability for environmental remediation for material sites |  | 110,000,000 |  |  |  | 110,000,000 |  |  |  |  |  |  |  |  | 72,000,000 |  |  |  |  |
Immaterial sites for environmental remediation (in number of sites) |  |  |  |  |  | 38 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total minimum recorded liability for immaterial sites |  | 3,000,000 |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation liability |  | 113,000,000 |  |  |  | 113,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets related to environmental remediation |  | 109,000,000 |  |  |  | 109,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of recorded liability recoverable from incentive mechanism |  |  |  |  |  | 37,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 72,000,000 |  |  |  | 72,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation costs to be recovered (as a percent) |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount that cleanup costs could exceed recorded liability for identified material sites |  |  |  |  |  | 159,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 4,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected annual environmental remediation costs, high end of range |  |  |  |  |  | 31,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental remediation costs |  |  |  |  |  | 3,000,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Federal limit on public liability claims from nuclear incident, approximate |  |  |  |  |  |  |  |  |  |  | 13,600,000,000 |  |  |  |  |  |  |  |  |
Private primary insurance purchased |  |  |  |  |  |  |  |  |  |  |  |  | 375,000,000 | 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, 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 |  | 450,000,000 |  |  |  | 450,000,000 |  | 547,500,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Self insurance retention per wildfire occurrence |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Wildfire Threshold For Additional Coverage |  | 550,000,000 |  |  |  | 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 |  | $ 84,000,000 |  | $ 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 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 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 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 Represents the recorded liability incurred at majority of the remaining sites through customer rates. + 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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