Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions	Jun. 30, 2022 USD ($)
Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	$ 1,198
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Total Available-for-Sale Debt Securities	177
Debt Securities [Member] \| Nuclear Decommissioning Trust (NDT) Fund [Member]
Schedule of Trust Investments [Line Items]
Less than one year	9
1 - 5 years	320
6 - 10 years	230
11 - 15 years	60
16 - 20 years	103
Over 20 years	476
Debt Securities [Member] \| Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Less than one year	0
1 - 5 years	30
6 - 10 years	26
11 - 15 years	7
16 - 20 years	19
Over 20 years	$ 95

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

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