XML 73 R61.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Investments (Summary of Changes in Fair Value of the Nuclear Decommissioning Trusts) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Summary Of Changes In The Fair Value [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 4,242 |
Balance at end of period | $ 4,381 |  | 4,381 |
Southern California Edison |  |  |  |
Summary Of Changes In The Fair Value [Roll Forward] |  |  |  |
Balance at beginning of period | 4,352 | $ 4,290 | 4,242 | $ 4,331
Gross realized gains | 13 | 22 | 112 | 75
Gross realized losses | 0 | (1) | (16) | (4)
Unrealized gains, net of losses | 87 | 72 | 114 | 113
Other-than-temporary impairments | (3) | (8) | (4) | (33)
Interest and dividends | 31 | 32 | 59 | 60
Income taxes | (26) | (24) | (26) | (42)
Decommissioning disbursements | (73) | (38) | (99) | (154)
Administrative expenses and other | 0 | (1) | (1) | (2)
Balance at end of period | $ 4,381 | $ 4,344 | $ 4,381 | $ 4,344

X
- Definition Decommissioning Trust Administrative Expenses and Other + References No definition available. + Details
Name: | eix_DecommissioningTrustAdministrativeExpensesandOther
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Decommissioning Trust Costs + References No definition available. + Details
Name: | eix_DecommissioningTrustCosts
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Decommissioning Trust Income Taxes + References No definition available. + Details
Name: | eix_DecommissioningTrustIncomeTaxes
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Discloses the amount of interest, dividend, contribution and other receipts during the period. + References No definition available. + Details
Name: | eix_DecommissioningTrustInterestDividendsContributionsAndOther
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Discloses the amount of other than temporary decline in value that has been recognized by the decommissioning trust during the period. + References No definition available. + Details
Name: | eix_DecommissioningTrustOtherThanTemporaryImpairments
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This item represents the amount of realized gain on investments in trust during the period from the sale of securities. + References No definition available. + Details
Name: | eix_DecommissioningTrustRealizedGainOnInvestments
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This item represents the amount of realized loss on investments in trust during the period from the sale of securities. + References No definition available. + Details
Name: | eix_DecommissioningTrustRealizedLossOnInvestments
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This item represents the amount of net unrealized gain on investments in trust during the period. + References No definition available. + Details
Name: | eix_DecommissioningTrustUnrealizedGainsOnInvestmentsNet
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_DecommissioningTrustAssetsAmount
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: |