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Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) $ 1 $ 1 $ 3 $ 2
Interest Expense (99) (96) (288) (291)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) 0 0 0 0
Operating Revenues 2,450 2,688 6,971 8,137
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion) 0 0 0 17
Power [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) 0   0 2
Interest Expense (24) (30) (66) (94)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) 0 0 0 0
Operating Revenues 1,075 1,096 3,102 3,846
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion) 0 0 0 17
Operating Revenues [Member] | Energy-Related Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) 0 1 0 2
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion 0 0 0 17
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) 0 0 0 0
Operating Revenues [Member] | Power [Member] | Energy-Related Contracts [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) 0 1 0 2
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion 0 0 0 17
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) 0 0 0 0
Interest Expense [Member] | Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) 1 0 3 0
Interest Expense 0 0 0 0
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) $ 0 $ 0 $ 0 $ 0