Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions	Sep. 30, 2022 USD ($)
Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	$ 1,135
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	162
Debt Securities [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Less than one year	8
1 - 5 years	316
6 - 10 years	209
11 - 15 years	66
16 - 20 years	91
Over 20 years	445
Debt Securities [Member] \| Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Less than one year	0
1 - 5 years	29
6 - 10 years	24
11 - 15 years	7
16 - 20 years	16
Over 20 years	$ 86

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

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