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Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions | Mar. 31, 2019 USD ($)
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Rabbi Trust [Member] |
Schedule of Trust Investments [Line Items] |
Less than one year | $ 0
1 - 5 years | 33
6 - 10 years | 30
11 - 15 years | 10
16 - 20 years | 25
Over 20 years | 110
Total Available-for-Sale Debt Securities | 208
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |
Schedule of Trust Investments [Line Items] |
Less than one year | 13
1 - 5 years | 257
6 - 10 years | 215
11 - 15 years | 44
16 - 20 years | 71
Over 20 years | 409
Total Available-for-Sale Debt Securities | $ 1,009

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