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Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions | Jun. 30, 2024 USD ($)
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Nuclear Decommissioning Trust (NDT) Fund [Member] |
Schedule of Trust Investments [Line Items] |
Total Available-for-Sale Debt Securities | $ 1,239
Rabbi Trust [Member] |
Schedule of Trust Investments [Line Items] |
Total Available-for-Sale Debt Securities | 153
Debt Securities [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |
Schedule of Trust Investments [Line Items] |
Less than one year | 22
1 - 5 years | 330
6 - 10 years | 228
11 - 15 years | 67
16 - 20 years | 103
Over 20 years | 489
Debt Securities [Member] | Rabbi Trust [Member] |
Schedule of Trust Investments [Line Items] |
Less than one year | 7
1 - 5 years | 27
6 - 10 years | 18
11 - 15 years | 9
16 - 20 years | 17
Over 20 years | $ 75

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