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Commitments And Contingent Liabilities (Minimum Fuel Purchase Requirements) (Detail) - Power [Member] $ in Millions | 3 Months Ended
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Mar. 31, 2018 USD ($)
Long-term Purchase Commitment [Line Items] |
Coverage percentage of nuclear fuel commitments of uranium, enrichment, and fabrication requirements | 100.00%
Nuclear Fuel Uranium [Member] |
Long-term Purchase Commitment [Line Items] |
Total five-year minimum purchase requirements | $ 242
Nuclear Fuel Enrichment [Member] |
Long-term Purchase Commitment [Line Items] |
Total five-year minimum purchase requirements | 346
Nuclear Fuel Fabrication [Member] |
Long-term Purchase Commitment [Line Items] |
Total five-year minimum purchase requirements | 170
Natural Gas [Member] |
Long-term Purchase Commitment [Line Items] |
Total five-year minimum purchase requirements | 1,024
Coal [Member] |
Long-term Purchase Commitment [Line Items] |
Total five-year minimum purchase requirements | $ 286

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- Definition Coverage percentage of nuclear fuel commitments of uranium, enrichment, and fabrication requirements. + References No definition available. + Details
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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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