XML 76 R58.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Derivative Instruments (Notional Values) (Details) - Southern California Edison - Electric Utility - Economic Hedges MWh in Thousands, GWh in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 Bcfe MWh GWh | Dec. 31, 2017 Bcfe MWh GWh
Electricity options, swaps and forwards (GWh) |  |
Derivative [Line Items] |  |
Notional volumes of derivative instruments | MWh | 2,320 | 475
Natural gas options, swaps and forwards (Bcf) |  |
Derivative [Line Items] |  |
Notional volumes of derivative instruments | Bcfe | 77 | 143
Congestion revenue rights (GWh) |  |
Derivative [Line Items] |  |
Notional volumes of derivative instruments | GWh | 30,154 | 78,765

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal energy measure used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix: | us-gaap_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=eix_SouthernCaliforniaEdisonCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=eix_ElectricUtilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=eix_EconomicHedgesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=eix_ElectricityOptionsSwapsAndForwardArrangementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=eix_NaturalGasOptionsSwapsAndForwardsArrangementBcfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=eix_CongestionRevenueRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |