Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) - Debt Securities [Member] - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Available-for-sale debt securities, Less than one year	$ 24
Available-for-sale debt securities, 1-5 years	335
Available-for-sale debt securities, 6-10 years	234
Available-for-sale debt securities, 11-15 years	84
Available-for-sale debt securities, 16-20 years	113
Available-for-sale debt securities, Over 20 years	544
Total Available-for-Sale Debt Securities	1,334	$ 1,147
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	40
Available-for-sale debt securities, 6-10 years	24
Available-for-sale debt securities, 11-15 years	10
Available-for-sale debt securities, 16-20 years	25
Available-for-sale debt securities, Over 20 years	117
Total Available-for-Sale Debt Securities	$ 216	$ 235

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

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