Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) - Debt Securities [Member] - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Available-for-sale debt securities, Less than one year	$ 12
Available-for-sale debt securities, 1-5 years	319
Available-for-sale debt securities, 6-10 years	221
Available-for-sale debt securities, 11-15 years	62
Available-for-sale debt securities, 16-20 years	96
Available-for-sale debt securities, Over 20 years	446
Total Available-for-Sale Debt Securities	1,156	$ 1,334
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Available-for-sale debt securities, Less than one year	0
Available-for-sale debt securities, 1-5 years	29
Available-for-sale debt securities, 6-10 years	23
Available-for-sale debt securities, 11-15 years	7
Available-for-sale debt securities, 16-20 years	16
Available-for-sale debt securities, Over 20 years	88
Total Available-for-Sale Debt Securities	$ 163	$ 216

Available For Sale Securities Debt Maturities After Fifteen Through Twenty Years Fair Value

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