XML 81 R70.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Regulatory Assets and Liabilities (Schedule of Net Regulatory Balancing Accounts) (Details) - Southern California Edison - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Regulatory balancing accounts | Energy resource recovery account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | $ 452 | $ 464
Regulatory balancing accounts | New system generation balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (190) | (197)
Refunds of excess revenue | Net regulatory balancing accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (1,726) | (1,698)
Refunds of excess revenue | Public purpose programs and energy efficiency programs |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (1,270) | (1,145)
Refunds of excess revenue | Tax accounting memorandum account and pole loading balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 4 | (259)
Refunds of excess revenue | Base revenue requirement balancing account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (500) | (200)
Refunds of excess revenue | DOE litigation memorandum account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (191) | (156)
Refunds of excess revenue | Greenhouse gas auction revenue |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 140 | (22)
Refunds of excess revenue | FERC balancing accounts |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | (220) | (205)
Refunds of excess revenue | Catastrophic event memorandum account |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | 109 | 102
Refunds of excess revenue | Other |  |
Regulatory Assets and Liabilities |  |
Asset (liability) | $ (60) | $ (80)

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://fasb.org/us-gaap/role/ref/legacyRef -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: |