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Commitments and Contingencies (Other Commitments) (Details) (Southern California Edison, USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012
Nuclear fuel supply contracts1 |  |
Other Commitments |  |
2013 | $ 170 | [1]
2014 | 76 | [1]
2015 | 76 | [1]
2016 | 126 | [1]
2017 | 95 | [1]
Thereafter | 369 | [1]
Total | 912 | [1]
Other fuel supply contracts |  |
Other Commitments |  |
2013 | 42 |
2014 | 60 |
2015 | 86 |
2016 | 48 |
2017 | 0 |
Thereafter | 0 |
Total | 236 |
Other contractual obligations |  |
Other Commitments |  |
2013 | 32 |
2014 | 38 |
2015 | 38 |
2016 | 19 |
2017 | 15 |
Thereafter | 271 |
Total | $ 413 |
[1] | These supply contracts are under review as part of events at San Onofre. See "—Contingencies—San Onofre Outage, Inspection and Repair Issues" below for further information.

X
- Definition The aggregate estimated amount the entity contracted to spend under the long-term purchase commitment following the balance sheet date. + References No definition available. + Details
Name: | eix_LongTermPurchaseCommitmentAggregateAmount
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Long Term Purchase Commitment Amount Thereafter + References No definition available. + Details
Name: | eix_LongTermPurchaseCommitmentAmountThereafter
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The estimated amount the entity contracted to spend under the long-term purchase commitment during the (a) fourth full fiscal year following the completion of the current fiscal year if the balance sheet date is for an interim period end or (b) the fifth full fiscal year if the balance sheet date is for the fiscal year end. + References No definition available. + Details
Name: | eix_LongTermPurchaseCommitmentAmountYearFive
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The estimated amount the entity contracted to spend under the long-term purchase commitment during the (a) third full fiscal year following the completion of the current fiscal year if the balance sheet date is for an interim period end or (b) the fourth full fiscal year if the balance sheet date is for the fiscal year end. + References No definition available. + Details
Name: | eix_LongTermPurchaseCommitmentAmountYearFour
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The estimated amount the entity contracted to spend under the long-term purchase commitment during the (a) remainder of the current fiscal year if the balance sheet date is for an interim period end or (b) the first full succeeding fiscal year if the balance sheet date is for the fiscal year end. + References No definition available. + Details
Name: | eix_LongTermPurchaseCommitmentAmountYearOne
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The estimated amount the entity contracted to spend under the long-term purchase commitment during the (a) second full fiscal year following the completion of the current fiscal year if the balance sheet date is for an interim period end or (b) the third full fiscal year if the balance sheet date is for the fiscal year end. + References No definition available. + Details
Name: | eix_LongTermPurchaseCommitmentAmountYearThree
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The estimated amount the entity contracted to spend under the long-term purchase commitment during the (a) first full fiscal year following the completion of the current fiscal year if the balance sheet date is for an interim period end or (b) the second full fiscal year if the balance sheet date is for the fiscal year end. + References No definition available. + Details
Name: | eix_LongTermPurchaseCommitmentAmountYearTwo
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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