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Available-For-Sale Securities (Schedule Of Accounts Receivable And Accounts Payable) (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Rabbi Trust [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Accounts Receivable | $ 5 | $ 1
Accounts Payable | 3 | 0
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Accounts Receivable | 8 | 17
Accounts Payable | $ 5 | $ 10

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- Details
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