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Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions | Mar. 31, 2023 USD ($)
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Nuclear Decommissioning Trust (NDT) Fund [Member] |
Schedule of Trust Investments [Line Items] |
Total Available-for-Sale Debt Securities | $ 1,203
Rabbi Trust [Member] |
Schedule of Trust Investments [Line Items] |
Total Available-for-Sale Debt Securities | 170
Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |
Schedule of Trust Investments [Line Items] |
Less than one year | 17
1 - 5 years | 303
6 - 10 years | 219
11 - 15 years | 64
16 - 20 years | 100
Over 20 years | 500
Debt Securities [Member] | Rabbi Trust [Member] |
Schedule of Trust Investments [Line Items] |
Less than one year | 2
1 - 5 years | 28
6 - 10 years | 23
11 - 15 years | 10
16 - 20 years | 16
Over 20 years | $ 91

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