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Summary of Significant Accounting Policies (Cash Equivalents) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Mar. 31, 2019
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Money market funds | $ 1,305 | $ 31
Book balances reclassified to accounts payable | 60 | 75
Southern California Edison |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |
Money market funds | 427 | 0
Book balances reclassified to accounts payable | $ 60 | $ 74

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

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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 No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=eix_SouthernCaliforniaEdisonCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |