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Summary of Significant Accounting Policies (Derivative Instruments) (Details) $ in Millions | 3 Months Ended
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Sep. 30, 2017 USD ($)
SCE |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |
Reclassified derivative liabilities | $ 914

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- Definition Derivative Liabilities Transfered Out Of Derivatives + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |