XML 91 R68.htm IDEA: XBRL DOCUMENT v3.5.0.2
Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 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) $ 0 $ 2 $ 1
Interest Expense (97) (97) (189) (195)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) 0 0 0 0
Operating Revenues 1,905 2,314 4,521 5,449
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 1
Interest Expense (20) (33) (42) (64)
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) 0 0 0 0
Operating Revenues 714 1,025 2,027 2,750
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 0 0 1
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 0 0 1
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 2 0
Interest Expense 0 0 0 0
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) $ 0 $ 0 $ 0 $ 0