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Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) - Debt Securities [Member] - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Available-for-sale debt securities, Less than one year | $ 17 |
Available-for-sale debt securities, 1-5 years | 314 |
Available-for-sale debt securities, 6-10 years | 214 |
Available-for-sale debt securities, 11-15 years | 62 |
Available-for-sale debt securities, 16-20 years | 101 |
Available-for-sale debt securities, Over 20 years | 505 |
Total Available-for-Sale Debt Securities | 1,213 | $ 1,156
Rabbi Trust [Member] |  |
Schedule of Trust Investments [Line Items] |  |
Available-for-sale debt securities, Less than one year | 8 |
Available-for-sale debt securities, 1-5 years | 27 |
Available-for-sale debt securities, 6-10 years | 16 |
Available-for-sale debt securities, 11-15 years | 10 |
Available-for-sale debt securities, 16-20 years | 20 |
Available-for-sale debt securities, Over 20 years | 80 |
Total Available-for-Sale Debt Securities | $ 161 | $ 163

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