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Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions | Mar. 31, 2022 USD ($)
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Nuclear Decommissioning Trust (NDT) Fund [Member] |
Schedule of Trust Investments [Line Items] |
Total Available-for-Sale Debt Securities | $ 1,257
Rabbi Trust [Member] |
Schedule of Trust Investments [Line Items] |
Total Available-for-Sale Debt Securities | 194
Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |
Schedule of Trust Investments [Line Items] |
Less than one year | 20
1 - 5 years | 324
6 - 10 years | 226
11 - 15 years | 70
16 - 20 years | 109
Over 20 years | 508
Debt Securities [Member] | Rabbi Trust [Member] |
Schedule of Trust Investments [Line Items] |
Less than one year | 0
1 - 5 years | 35
6 - 10 years | 26
11 - 15 years | 8
16 - 20 years | 21
Over 20 years | $ 104

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