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Trust Investments (Narrative) (Detail) | 9 Months Ended
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Sep. 30, 2018 Facility
Power [Member] |
Schedule of Trust Investments [Line Items] |
Number of Nuclear Facilities | 5

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- Definition Number of Nuclear Facilities + References No definition available. + Details
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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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |