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Trust Investments (Schedule Of Accounts Receivable And Accounts Payable) (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Accounts Receivable | $ 13 | $ 24
Accounts Payable | 14 | 74
Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Accounts Receivable | 1 | 2
Accounts Payable | $ 0 | $ 1

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- Details
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