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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