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Commitments and Contingencies (Environmental Remediation) (Details) - Southern California Edison $ in Millions | 3 Months Ended
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Mar. 31, 2020 USD ($) site
Schedule Of Commitments And Contingencies [Line Items] |
Minimum liability for environmental remediation | $ 244
Regulatory assets related to environmental remediation | 235
Portion of recorded liability recoverable from incentive mechanism | $ 40
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 | $ 195
Environmental remediation costs to be recovered (as a percent) | 100.00%
Amount that cleanup costs could exceed recorded liability for identified material sites | $ 109
Amount that cleanup costs could exceed recorded liability for immaterial sites | $ 8
Clean up (period) | 30 years
Remediation cost estimates (period) | 5 years
Expected remediation costs for each of the next four years, low end of range | $ 7
Expected remediation costs for each of the next four years, high end of range | 18
Environmental remediation costs | $ 2
Material sites |
Schedule Of Commitments And Contingencies [Line Items] |
Identified material sites for environmental remediation (in number of sites) | site | 23
Minimum costs to be identified site | $ 1
Minimum liability for environmental remediation | 241
Material sites | San Onofre |
Schedule Of Commitments And Contingencies [Line Items] |
Minimum liability for environmental remediation | $ 176
Immaterial sites |
Schedule Of Commitments And Contingencies [Line Items] |
Immaterial sites for environmental remediation (in number of sites) | site | 14
Immaterial sites | Minimum |
Schedule Of Commitments And Contingencies [Line Items] |
Minimum liability for environmental remediation | $ 3

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