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Derivative Instruments (Balance Sheet Disclosures) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value of Derivative Instruments |  |  |  |
Short-Term, Derivative Assets | $ 102 us-gaap_DerivativeAssetsCurrent |  | $ 122 us-gaap_DerivativeAssetsCurrent |
Long-Term, Derivative Assets | 219 us-gaap_DerivativeAssetsNoncurrent |  | 251 us-gaap_DerivativeAssetsNoncurrent |
Short-Term, Derivative Liabilities | 196 us-gaap_DerivativeLiabilitiesCurrent |  | 152 us-gaap_DerivativeLiabilitiesCurrent |
Long-Term, Derivative Liabilities | 1,052 us-gaap_DerivativeLiabilitiesNoncurrent |  | 1,042 us-gaap_DerivativeLiabilitiesNoncurrent |
Southern California Edison |  |  |  |
Fair Value of Derivative Instruments |  |  |  |
Short-Term, Derivative Assets | 102 us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 122 us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Long-Term, Derivative Assets | 219 us-gaap_DerivativeAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 251 us-gaap_DerivativeAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Short-Term, Derivative Liabilities | 196 us-gaap_DerivativeLiabilitiesCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 152 us-gaap_DerivativeLiabilitiesCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Long-Term, Derivative Liabilities | 1,052 us-gaap_DerivativeLiabilitiesNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 1,042 us-gaap_DerivativeLiabilitiesNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Southern California Edison | Electric Utility |  |  |  |
Fair Value of Derivative Instruments |  |  |  |
Short-Term, Derivative Assets | 102 us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 122 us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Long-Term, Derivative Assets | 219 us-gaap_DerivativeAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 251 us-gaap_DerivativeAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Derivative Assets, Total | 321 us-gaap_DerivativeAssets / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 373 us-gaap_DerivativeAssets / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Short-Term, Derivative Liabilities | 196 us-gaap_DerivativeLiabilitiesCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 152 us-gaap_DerivativeLiabilitiesCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Long-Term, Derivative Liabilities | 1,052 us-gaap_DerivativeLiabilitiesNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 1,042 us-gaap_DerivativeLiabilitiesNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Derivative Liabilities, Total | 1,248 us-gaap_DerivativeLiabilities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 1,194 us-gaap_DerivativeLiabilities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Net Liability | 927 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 821 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Southern California Edison | Electric Utility | Gross amounts recognized |  |  |  |
Fair Value of Derivative Instruments |  |  |  |
Short-Term, Derivative Assets | 104 us-gaap_DerivativeAssetsCurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 141 us-gaap_DerivativeAssetsCurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Long-Term, Derivative Assets | 219 us-gaap_DerivativeAssetsNoncurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 251 us-gaap_DerivativeAssetsNoncurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Derivative Assets, Total | 323 us-gaap_DerivativeAssets / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 392 us-gaap_DerivativeAssets / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Short-Term, Derivative Liabilities | 259 us-gaap_DerivativeLiabilitiesCurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 178 us-gaap_DerivativeLiabilitiesCurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Long-Term, Derivative Liabilities | 1,052 us-gaap_DerivativeLiabilitiesNoncurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 1,045 us-gaap_DerivativeLiabilitiesNoncurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Derivative Liabilities, Total | 1,311 us-gaap_DerivativeLiabilities / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 1,223 us-gaap_DerivativeLiabilities / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Net Liability | 988 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 831 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_EconomicHedgesMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Southern California Edison | Electric Utility | Gross amounts offset in consolidated balance sheets |  |  |  |
Fair Value of Derivative Instruments |  |  |  |
Short-Term, Derivative Assets | (2)us-gaap_DerivativeAssetsCurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | (19)us-gaap_DerivativeAssetsCurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Long-Term, Derivative Assets | 0 us-gaap_DerivativeAssetsNoncurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 0 us-gaap_DerivativeAssetsNoncurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Derivative Assets, Total | (2)us-gaap_DerivativeAssets / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | (19)us-gaap_DerivativeAssets / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Short-Term, Derivative Liabilities | (2)us-gaap_DerivativeLiabilitiesCurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | (19)us-gaap_DerivativeLiabilitiesCurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Long-Term, Derivative Liabilities | 0 us-gaap_DerivativeLiabilitiesNoncurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 0 us-gaap_DerivativeLiabilitiesNoncurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Derivative Liabilities, Total | (2)us-gaap_DerivativeLiabilities / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | (19)us-gaap_DerivativeLiabilities / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Net Liability | 0 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |  | 0 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / eix_DerivativeInstrumentsByHedgingRelationshipAxis = us-gaap_NettingAndCollateralMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember |
Southern California Edison | Electric Utility | Cash collateral posted |  |  |  |
Fair Value of Derivative Instruments |  |  |  |
Short-Term, Derivative Assets | 0 us-gaap_DerivativeAssetsCurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1] | 0 us-gaap_DerivativeAssetsCurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1]
Long-Term, Derivative Assets | 0 us-gaap_DerivativeAssetsNoncurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1] | 0 us-gaap_DerivativeAssetsNoncurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1]
Derivative Assets, Total | 0 us-gaap_DerivativeAssets / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1] | 0 us-gaap_DerivativeAssets / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1]
Short-Term, Derivative Liabilities | (61)us-gaap_DerivativeLiabilitiesCurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1] | (7)us-gaap_DerivativeLiabilitiesCurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1]
Long-Term, Derivative Liabilities | 0 us-gaap_DerivativeLiabilitiesNoncurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1] | (3)us-gaap_DerivativeLiabilitiesNoncurrent / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1]
Derivative Liabilities, Total | (61)us-gaap_DerivativeLiabilities / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1] | (10)us-gaap_DerivativeLiabilities / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1]
Net Liability | $ (61)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1] | $ (10)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / eix_DerivativeInstrumentsByHedgingRelationshipAxis = eix_CashCollateralReceivedPostedMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / us-gaap_StatementBusinessSegmentsAxis = eix_ElectricUtilityMember | [1]
[1] | In addition, at December 31, 2014 and 2013, SCE had posted $36 million and $19 million, respectively, of collateral that is not offset against derivative liabilities and is reflected in "Other current assets" on the consolidated balance sheets.

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