XML 25 R42.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Summary of Significant Accounting Policies Asset Retirement Obligation (Details) (USD $) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014
Significant Accounting Policies [Line Items] |  |  |  |  |
Decommissioning Costs, Future Value |  |  |  |  | $ 4,400,000,000
Asset Retirement Obligation, Discount Rate (percent) | 6.30% |  |  |  |
Southern California Edison |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Decommissioning Costs, Future Value |  |  |  |  | 3,300,000,000
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Beginning balance | 3,418,000,000 |  | 2,782,000,000 |  |
Accretion1 | 150,000,000 | [1] | 182,000,000 | [1] |
Revisions | (604,000,000) |  | 455,000,000 |  |
Liabilities settled | (4,000,000) |  | (1,000,000) |  |
Ending balance | 2,960,000,000 |  | 3,418,000,000 |  |
Southern California Edison | San Onofre |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Asset Retirement Obligation, Discount Rate (percent) | 6.30% |  |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |
Beginning balance | 2,700,000,000 |  |  |  |
Revisions | 604,000,000 |  |  |  |
Ending balance | $ 2,200,000,000 |  |  |  |
[1] | An ARO represents the present value of a future obligation. Accretion is an increase in the liability to account for the time value of money resulting from discounting.

X
- Definition Asset Retirement Obligation, Discount Rate + References No definition available. + Details
Name: | eix_AssetRetirementObligationDiscountRate
Namespace Prefix: | eix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Decommissioning Liability, Cost Estimate, Undiscounted + References No definition available. + Details
Name: | eix_DecommissioningLiabilityCostEstimateUndiscounted
Namespace Prefix: | eix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + 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 (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
Name: | us-gaap_AssetRetirementObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligationAccretionExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligationLiabilitiesSettled
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + 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 (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligationRevisionOfEstimate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_AssetRetirementObligationRollForwardAnalysisRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration