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Trust Investments (Schedule Of Accounts Receivable And Accounts Payable) (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Accounts Receivable | $ 18 | $ 11
Accounts Payable | 10 | 11
Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Accounts Receivable | 2 | 1
Accounts Payable | $ 0 | $ 0

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- Details
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- Details
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