XML 116 R96.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 01, 2012 | Dec. 31, 2015 | Dec. 31, 2014
Regulatory Assets |  |  |  |
Regulatory Assets, Current |  |  | $ 560 | $ 1,254
Regulatory Asset, Long-term |  |  | 7,512 | 7,612
Regulatory Liabilities |  |  |  |
Regulatory Liabilities, Current |  |  | 1,128 | 401
Regulatory Liabilities, Long-term |  |  | $ 5,676 | 5,889
Southern California Edison |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Regulatory assets, energy derivatives, low range of contract expiration (in years) |  |  | 2 years |
Regulatory assets, energy derivatives, high range of contract expiration (in years) |  |  | 45 years |
Regulatory assets related to deferred income taxes, recovery period, low range (in years) |  |  | 1 year |
Regulatory assets related to deferred income taxes, recovery period, high range (in years) |  |  | 60 years |
Low end of the range of remaining original amortization (in years) |  |  | 1 year |
High end of the range of remaining original amortization (in years) |  |  | 35 years |
Regulatory Assets |  |  |  |
Regulatory Assets, Current |  |  | $ 560 | 1,254
Regulatory Asset, Long-term |  |  | 7,512 | 7,612
Total Regulatory Assets |  |  | 8,072 | 8,866
Regulatory Liabilities |  |  |  |
Regulatory Liabilities, Current |  |  | 1,128 | 401
Regulatory Liabilities, Long-term |  |  | 5,676 | 5,889
Total Regulatory Liabilities |  |  | 6,804 | 6,290
Southern California Edison | FERC-Approved Settlement Agreements |  |  |  |
Regulatory Liabilities |  |  |  |
Litigation Settlement, Amount |  |  | 219 |
Litigation Settlement, Amount Subject to Shareholder Incentive |  |  | 15 |
Southern California Edison | Regulatory balancing accounts |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Assets, Current |  |  | 382 | 1,088
Regulatory Asset, Long-term |  |  | 36 | 44
Southern California Edison | Pensions and other postretirement benefits |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Asset, Long-term |  |  | 849 | 1,218
Southern California Edison | Environmental remediation |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Asset, Long-term |  |  | 129 | 107
Southern California Edison | Energy derivatives |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Assets, Current |  |  | 159 | 159
Regulatory Asset, Long-term |  |  | 1,027 | 850
Southern California Edison | Other |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Assets, Current |  |  | 19 | 7
Regulatory Asset, Long-term |  |  | 288 | 244
Regulatory Liabilities |  |  |  |
Regulatory Liabilities, Current |  |  | 22 | 21
Regulatory Liabilities, Long-term |  |  | 79 | 24
Southern California Edison | Deferred income taxes, net |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Asset, Long-term |  |  | $ 3,757 | $ 3,405
Southern California Edison | Unamortized investments, net |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Return rate earned on assets included in rate base (as a percent) |  |  | 7.90% | 7.90%
Regulatory Assets |  |  |  |
Regulatory Asset, Long-term |  |  | $ 182 | $ 255
Southern California Edison | San Onofre |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Asset, Long-term |  |  | 1,043 | 1,288
Southern California Edison | Unamortized loss on reacquired debt |  |  |  |
Regulatory Assets |  |  |  |
Regulatory Asset, Long-term |  |  | 201 | 201
Southern California Edison | Regulatory balancing accounts |  |  |  |
Regulatory Liabilities |  |  |  |
Regulatory Liabilities, Current |  |  | 1,106 | 380
Regulatory Liabilities, Long-term |  |  | 1,314 | 1,083
Southern California Edison | Costs of removal |  |  |  |
Regulatory Liabilities |  |  |  |
Regulatory Liabilities, Long-term |  |  | 2,781 | 2,826
Southern California Edison | Recoveries in excess of ARO liabilities1 |  |  |  |
Regulatory Liabilities |  |  |  |
Regulatory Liabilities, Long-term | [1] |  | $ 1,502 | $ 1,956
Legacy Meters | Southern California Edison | Unamortized investments, net |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Return rate earned on assets included in rate base (as a percent) |  |  | 6.46% | 6.46%
San Onofre | Southern California Edison |  |  |  |
Regulatory Assets and Liabilities |  |  |  |
Return rate earned on assets included in rate base (as a percent) |  |  | 2.62% |
Period for rate recovery |  | 10 years |  |
[1] | Represents the cumulative differences between ARO expenses and amounts collected in rates primarily for the decommissioning of the SCE's nuclear generation facilities. Decommissioning costs recovered through rates are primarily placed in nuclear decommissioning trusts. This regulatory liability also represents the deferral of realized and unrealized gains and losses on the nuclear decommissioning trust investments (see Note 9).

X
- Definition Litigation Settlement, Amount Subject to Shareholder Incentive + References No definition available. + Details
Name: | eix_LitigationSettlementAmountSubjecttoShareholderIncentive
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Period For Rate Recovery1 + References No definition available. + Details
Name: | eix_PeriodForRateRecovery1
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | eix_RegulatoryAssetAbstract
Namespace Prefix: | eix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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 Regulatory assets, energy derivative contracts, high range of expiration + References No definition available. + Details
Name: | eix_RegulatoryAssetsEnergyDerivativeContractsHighRangeOfExpiration
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory assets, energy derivative contracts, low range of expiration + References No definition available. + Details
Name: | eix_RegulatoryAssetsEnergyDerivativeContractsLowRangeOfExpiration
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory assets, recovery period, high range + References No definition available. + Details
Name: | eix_RegulatoryAssetsRecoveryPeriodHighRange
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory assets, recovery period, low range + References No definition available. + Details
Name: | eix_RegulatoryAssetsRecoveryPeriodLowRange
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | eix_RegulatoryLiabilityAbstract
Namespace Prefix: | eix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory Noncurrent Asset, Amortization Period, High End of Range + References No definition available. + Details
Name: | eix_RegulatoryNoncurrentAssetAmortizationPeriodHighEndofRange
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Regulatory Noncurrent Asset, Amortization Period, Low End of Range + References No definition available. + Details
Name: | eix_RegulatoryNoncurrentAssetAmortizationPeriodLowEndofRange
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the return rate earned on assets included in rate base. + References No definition available. + Details
Name: | eix_ReturnRateEarnedOnAssetsIncludedInRateBase
Namespace Prefix: | eix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets 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_RegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + 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_RegulatoryAssetsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + 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_RegulatoryAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount for the individual regulatory liability as itemized in a table of 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 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
Name: | us-gaap_RegulatoryLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current 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 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
Name: | us-gaap_RegulatoryLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_RegulatoryLiabilityNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | us-gaap_LitigationCaseAxis=eix_FERCApprovedSettlementAgreementsMember
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_RegulatoryAssetsAndLiabilitiesAxis=us-gaap_PensionAndOtherPostretirementPlansCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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

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

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

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=eix_LegacyMetersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=eix_SanOnofreMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |