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Commitments and Contingencies (Environmental Remediation) (Details) - Southern California Edison | 3 Months Ended
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Mar. 31, 2017 USD ($) site | Mar. 31, 2016 USD ($)
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 | $ 127,000,000 |
Immaterial sites for environmental remediation (in number of sites) | site | 17 |
Environmental remediation liability | $ 130,000,000 |
Regulatory assets related to environmental remediation | 125,000,000 |
Portion of recorded liability recoverable from incentive mechanism | $ 47,000,000 |
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 | $ 78,000,000 |
Environmental remediation costs to be recovered (as a percent) | 100.00% |
Amount that cleanup costs could exceed recorded liability for identified material sites | $ 149,000,000 |
Amount that cleanup costs could exceed recorded liability for immaterial sites | $ 8,000,000 |
Remediation cost estimates (period) | 5 years |
Environmental remediation costs | $ 2,000,000 | $ 1,000,000
Minimum |  |
Schedule Of Commitments And Contingencies [Line Items] |  |
Minimum liability for environmental remediation for immaterial sites | 3,000,000 |
Expected annual environmental remediation costs | $ 5,000,000 |
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 | $ 18,000,000 |
San Onofre |  |
Schedule Of Commitments And Contingencies [Line Items] |  |
Minimum liability for environmental remediation for material sites | $ 75,000,000 |

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