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Commitments And Contingent Liabilities (Minimum Fuel Purchase Requirements) (Detail) - Power [Member] $ in Millions | 9 Months Ended
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Sep. 30, 2015 USD ($)
Long-term Purchase Commitment [Line Items] |
Coverage percentage of nuclear fuel commitments of uranium, enrichment, and fabrication requirements | 100.00%
Commitments Through 2019 [Member] | Nuclear Fuel Uranium [Member] |
Long-term Purchase Commitment [Line Items] |
Total minimum purchase requirements | $ 440
Commitments Through 2019 [Member] | Nuclear Fuel Enrichment [Member] |
Long-term Purchase Commitment [Line Items] |
Total minimum purchase requirements | 345
Commitments Through 2019 [Member] | Nuclear Fuel Fabrication [Member] |
Long-term Purchase Commitment [Line Items] |
Total minimum purchase requirements | 179
Commitments Through 2019 [Member] | Natural Gas [Member] |
Long-term Purchase Commitment [Line Items] |
Total minimum purchase requirements | 1,001
Commitments Through 2019 [Member] | Coal [Member] |
Long-term Purchase Commitment [Line Items] |
Total minimum purchase requirements | $ 331

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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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