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Trust Investments (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions | Sep. 30, 2018 USD ($)
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Rabbi Trust [Member] |
Schedule of Trust Investments [Line Items] |
Less than one year | $ 3
1 - 5 years | 28
6 - 10 years | 32
11 - 15 years | 7
16 - 20 years | 22
Over 20 years | 108
Total Available-for-Sale Debt Securities | 200
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |
Schedule of Trust Investments [Line Items] |
Less than one year | 11
1 - 5 years | 282
6 - 10 years | 201
11 - 15 years | 47
16 - 20 years | 73
Over 20 years | 362
Total Available-for-Sale Debt Securities | $ 976

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