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Commitments and Contingencies (Environmental Remediation) (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 USD ($) site | Sep. 30, 2015 USD ($) | Aug. 31, 2016 USD ($)
Maximum |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Minimum liability for environmental remediation for immaterial sites |  |  | $ 74,500,000
Southern California Edison |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Identified material sites for environmental remediation (in number of sites) | site | 19 |  |
Minimum costs to be identified site | $ 1,000,000 |  |
Minimum liability for environmental remediation for material sites | $ 130,000,000 |  |
Immaterial sites for environmental remediation (in number of sites) | site | 39 |  |
Environmental remediation liability | $ 134,000,000 |  |
Regulatory assets related to environmental remediation | 128,000,000 |  |
Portion of recorded liability recoverable from incentive mechanism | $ 46,000,000 |  |
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 | $ 82,000,000 |  |
Environmental remediation costs to be recovered (as a percent) | 100.00% |  |
Amount that cleanup costs could exceed recorded liability for identified material sites | $ 166,000,000 |  |
Amount that cleanup costs could exceed recorded liability for immaterial sites | $ 8,000,000 |  |
Remediation cost estimates (period) | 4 years |  |
Environmental remediation costs | $ 3,000,000 | $ 5,000,000 |
Southern California Edison | Minimum |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Minimum liability for environmental remediation for immaterial sites | 4,000,000 |  |
Expected annual environmental remediation costs | $ 7,000,000 |  |
Southern California Edison | Maximum |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Maximum expected period for cleanup of identified sites (in years) | 30 years |  |
Expected annual environmental remediation costs | $ 24,000,000 |  |
Southern California Edison | San Onofre |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Minimum liability for environmental remediation for material sites | $ 78,000,000 |  |

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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 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 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 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 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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