XML 101 R80.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Income Taxes (Textual) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2015 | Mar. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Accumulated deferred income net income tax liabilities |  |  | $ 4,500 |  |  |
Re-measurement of federal net operating loss carryforwards |  |  | 466 |  |  |
Unrecognized tax benefits that would impact the effective tax rate |  |  | 308 |  |  | $ 347
Tax Years 2007 To 2012 |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Expected refund |  |  |  |  | $ (7) |
Disallowance of Repair Allowance Deduction |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Base rate offset |  |  |  | $ 324 |  |
Rate base offset amortization period (years) |  |  |  | 27 years |  |
Capistrano Wind | Affiliated Entity | Tax Allocation Agreement |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Due to affiliate under tax allocation agreements |  |  | 199 |  |  | 242
SCE |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Accumulated deferred income net income tax liabilities |  |  | 5,000 |  |  |
Changes to earnings charge |  |  | 33 |  |  |
Granted BRRBA reduction | $ 234 |  |  |  |  |
Refund |  | $ 133 |  |  |  |
After tax refund |  | $ 79 |  |  |  |
Unrecognized tax benefits that would impact the effective tax rate |  |  | $ 167 |  |  | $ 243
SCE | Disallowance of Repair Allowance Deduction |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Federal tax liability |  |  |  | $ 382 |  |

X
- Definition Deferred Tax Base Rate Offset, Amortization Period + References No definition available. + Details
Name: | eix_DeferredTaxBaseRateOffsetAmortizationPeriod
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Tax Rate Base Offset + References No definition available. + Details
Name: | eix_DeferredTaxRateBaseOffset
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Income Tax Disclosures [Line Items] + References No definition available. + Details
Name: | eix_IncomeTaxDisclosuresLineItems
Namespace Prefix: | eix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Rate Related Customer Refund + References No definition available. + Details
Name: | eix_PublicUtilitiesRateRelatedCustomerRefund
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Public Utilities, Rate Related Customer Refund, Net of Tax + References No definition available. + Details
Name: | eix_PublicUtilitiesRateRelatedCustomerRefundNetofTax
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense (Benefit) + References No definition available. + Details
Name: | eix_TaxCutsandJobsActof2017ChangeinTaxRateDeferredTaxAssetIncomeTaxExpenseBenefit
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Liability, Income Tax (Expense) Benefit + References No definition available. + Details
Name: | eix_TaxCutsandJobsActof2017ChangeinTaxRateDeferredTaxLiabilityIncomeTaxExpenseBenefit
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit) + References No definition available. + Details
Name: | eix_TaxCutsandJobsActof2017IncomeTaxExpenseBenefit
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of obligations due all related parties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(3),(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.17) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
Name: | us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28446-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28511-109314 + Details
Name: | us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_TaxPeriodAxis=eix_TaxYears2007To2012Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | eix_TaxAdjustmentAxis=eix_DisallowanceofRepairAllowanceDeductionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CounterpartyNameAxis=eix_CapistranoWindHoldingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_AffiliatedEntityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionAxis=eix_TaxAllocationAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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