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Summary of Significant Accounting Policies (Organization and Basis of Presentation) (Details) mi² in Thousands | 12 Months Ended
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Dec. 31, 2017 mi²
Electric Utility | SCE |
Segment Reporting Information [Line Items] |
Supply Of Electricity Area Covered (in square miles) | 50

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Period Type: | duration

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

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- Details
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Namespace Prefix: |
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