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Other Income and Expenses (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Other income: |  |  |  |
Equity allowance for funds used during construction | $ 27 | $ 27 | $ 47 | $ 56
Increase in cash surrender value of life insurance policies | 7 | 7 | 14 | 13
Other | 2 | 5 | 6 | 8
Total other income | 36 | 39 | 67 | 77
Other expenses: |  |  |  |
Civic, political and related activities and donations | 10 | 9 | 17 | 15
Other | 9 | 4 | 9 | 10
Total other expenses | $ 19 | $ 13 | $ 26 | $ 25

X
- Definition This element represents civic, political and related activities and donations. + References No definition available. + Details
Name: | sce_CivicPoliticalRelatedActivitiesAndDonations
Namespace Prefix: | sce_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the net change during the reporting period in cash surrender value of life insurance policies. + References No definition available. + Details
Name: | sce_IncreaseDecreaseInCashSurrenderValueOfLifeInsurancePolicies
Namespace Prefix: | sce_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents other miscellaneous nonoperating expenses excluding competitive power generation. + References No definition available. + Details
Name: | sce_OtherExpenseExcludingCompetitivePowerGeneration
Namespace Prefix: | sce_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents other miscellaneous nonoperating income excluding competitive power generation. + References No definition available. + Details
Name: | sce_OtherIncomeExcludingCompetitivePowerGeneration
Namespace Prefix: | sce_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | sce_OtherNonoperatingExpensesAbstract
Namespace Prefix: | sce_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | sce_OtherNonoperatingIncomeAbstract
Namespace Prefix: | sce_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the utility expenses not otherwise defined. + References No definition available. + Details
Name: | sce_OtherUtilityExpense
Namespace Prefix: | sce_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents the utility income not otherwise defined. + References No definition available. + Details
Name: | sce_OtherUtilityIncome
Namespace Prefix: | sce_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501569&loc=d3e55921-110430 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 71 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + Details
Name: | us-gaap_PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration