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Commitments And Contingent Liabilities (Minimum Fuel Purchase Requirements) (Detail) (Power [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Long-term Purchase Commitment [Line Items]  
Coverage percentage of nuclear fuel commitments of uranium, enrichment, and fabrication requirements 100.00%
Commitments Through 2018 [Member] | Nuclear Fuel Uranium [Member]
 
Long-term Purchase Commitment [Line Items]  
Total minimum purchase requirements $ 450
Commitments Through 2018 [Member] | Nuclear Fuel Enrichment [Member]
 
Long-term Purchase Commitment [Line Items]  
Total minimum purchase requirements 369
Commitments Through 2018 [Member] | Nuclear Fuel Fabrication [Member]
 
Long-term Purchase Commitment [Line Items]  
Total minimum purchase requirements 174
Commitments Through 2018 [Member] | Natural Gas [Member]
 
Long-term Purchase Commitment [Line Items]  
Total minimum purchase requirements 877
Commitments Through 2018 [Member] | Coal [Member]
 
Long-term Purchase Commitment [Line Items]  
Total minimum purchase requirements $ 367