XML 79 R99.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Regulatory Assets and Liabilities (Regulatory Balancing Accounts) (Details) (Regulatory balancing accounts, USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Regulatory balancing accounts | Energy resource recovery account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | $ 1,028 us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_EnergyResourceRecoveryAccountMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember | $ 1,005 us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_EnergyResourceRecoveryAccountMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember
Regulatory balancing accounts | Four Corners memorandum account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | 0 us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_FourCornersBalancingAccountMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember | 145 us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_FourCornersBalancingAccountMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember
Regulatory balancing accounts | New system generation balancing account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | 35 us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_NewSystemGenerationBalancingAccountMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember | 132 us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_NewSystemGenerationBalancingAccountMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember
Regulatory balancing accounts | Public purpose programs and energy efficiency programs |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (874)us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_PublicPurposeProgramsandEnergyEfficiencyProgramsMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember | (1,152)us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_PublicPurposeProgramsandEnergyEfficiencyProgramsMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember
Regulatory balancing accounts | Base rate recovery balancing account |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (5)us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_BaseRateRecoveryBalancingAccountMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember | (247)us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_BaseRateRecoveryBalancingAccountMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember
Regulatory balancing accounts | Greenhouse gas auction revenue |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (182)us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_GreenhouseGasAuctionRevenueMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember | (385)us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_GreenhouseGasAuctionRevenueMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember
Regulatory balancing accounts | FERC balancing accounts |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (32)us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_FERCBalancingAccountMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember | (59)us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_FERCBalancingAccountMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember
Regulatory balancing accounts | Other |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (104)us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_OtherBalancingAccountMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember | 0 us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_OtherBalancingAccountMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember
Regulatory balancing accounts | Liability |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | (331)us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_SignificantComponentsMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember | (554)us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_SignificantComponentsMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember
Southern California Edison | Regulatory balancing accounts | Generator settlements |  |
Regulatory Assets and Liabilities |  |
Net Regulatory Assets Pertaining to Balancing Accounts | $ (197)us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_FERCEnergySettlementsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember | $ 7 us-gaap_NetRegulatoryAssets / eix_ComponentofBalancingAccountAxis = eix_FERCEnergySettlementsMember / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember / eix_RegulatoryAssetsAndLiabilitiesAxis = us-gaap_RevenueSubjectToRefundMember

X
- Details
Name: | eix_RegulatoryAssetsAndLiabilitiesLineItems
Namespace Prefix: | eix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_NetRegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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