XML 86 R70.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Regulatory Assets and Liabilities (Schedule of Net Regulatory Balancing Accounts) (Details) - Southern California Edison - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Regulatory balancing accounts | Energy resource recovery account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | $ 413 | $ 464
Regulatory balancing accounts | New system generation balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (213) | (197)
Refunds of excess revenue | Net regulatory balancing accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (1,987) | (1,698)
Refunds of excess revenue | Public purpose programs and energy efficiency programs |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (1,288) | (1,145)
Refunds of excess revenue | Tax accounting memorandum account and pole loading balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (260) | (259)
Refunds of excess revenue | Base revenue requirement balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (322) | (200)
Refunds of excess revenue | DOE litigation memorandum account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (156) | (156)
Refunds of excess revenue | Greenhouse gas auction revenue |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (50) | (22)
Refunds of excess revenue | FERC balancing accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (222) | (205)
Refunds of excess revenue | Catastrophic event memorandum account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 94 | 90
Refunds of excess revenue | Other |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | $ 17 | $ (68)

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + 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: |

X
- Details
Name: | eix_RegulatoryAssetsAndLiabilitiesAxis=us-gaap_RegulatoryClauseRevenuesUnderRecoveredMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eix_ComponentofBalancingAccountAxis=eix_EnergyResourceRecoveryAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eix_ComponentofBalancingAccountAxis=eix_NewSystemGenerationBalancingAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eix_RegulatoryAssetsAndLiabilitiesAxis=us-gaap_RevenueSubjectToRefundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eix_ComponentofBalancingAccountAxis=eix_SignificantComponentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eix_ComponentofBalancingAccountAxis=eix_PublicPurposeProgramsandEnergyEfficiencyProgramsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eix_ComponentofBalancingAccountAxis=eix_TaxAccountingMemorandumAccountandPoleLoadingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eix_ComponentofBalancingAccountAxis=eix_BaseRateRecoveryBalancingAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eix_ComponentofBalancingAccountAxis=eix_DepartmentofEnergyLitigationMemorandumAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eix_ComponentofBalancingAccountAxis=eix_GreenhouseGasAuctionRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eix_ComponentofBalancingAccountAxis=eix_FERCBalancingAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eix_ComponentofBalancingAccountAxis=eix_CatastrophicEventMemorandumAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eix_ComponentofBalancingAccountAxis=eix_OtherBalancingAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |