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Summary of Significant Accounting Policies (Cash) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Cash and Cash Equivalents Items [Line Items] |  |
Maximum maturity period of cash equivalent investments (in months) | 3 months |
Money market funds | $ 63 | $ 68
Cash reclassified to accounts payable | 148 | 168
Southern California Edison |  |
Cash and Cash Equivalents Items [Line Items] |  |
Money market funds | 5 | 8
Cash reclassified to accounts payable | $ 143 | $ 163

X
- Definition This element represents the amount of cash which is reclassified as accounts payable under the cash management program. + References No definition available. + Details
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Namespace Prefix: | eix_
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Balance Type: | debit
Period Type: | instant

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- Definition This element represents the maximum maturity period of the investments considered as cash equivalents. + References No definition available. + Details
Name: | eix_MaximumMaturityOfCashEquivalentInvestmentsPeriod
Namespace Prefix: | eix_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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Balance Type: | debit
Period Type: | instant

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