XML 40 R32.htm IDEA: XBRL DOCUMENT v3.2.0.727
Derivative Instruments (Income Statement Disclosure) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Effect of Cash Flow Hedges on Results of Operations [Abstract]        
Gains (Losses) Recognized in Other Comprehensive Income (Loss) $ 66 $ (10) $ (11) $ (39)
Gains (Losses) Reclassified from Accumulated OCI into Net Income (34) 7 (55) (7)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 202 (167) 428 (465)
Gains (losses) on commodity contracts, recorded as regulatory assets and or liabilities on the balance sheet due to regulatory treatment 23 11 (63) 147
Commodity Contract [Member] | Gains (losses) included in operating revenues [Member]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 178 (153) 415 (425)
Commodity Contract [Member] | Gains (losses) included in fuel, purchased power and interchange [Member]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 0 0 2 (4)
Interest Rate Contract [Member]        
Effect of Cash Flow Hedges on Results of Operations [Abstract]        
Gains (Losses) Recognized in Other Comprehensive Income (Loss) 73 (27) 4 (54)
Gains (Losses) Reclassified from Accumulated OCI into Net Income (19) (16) (38) (32)
Interest Rate Contract [Member] | Gain Loss Included In Interest Expense Member        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 24 (8) 11 (35)
Foreign Exchange Contract [Member]        
Effect of Cash Flow Hedges on Results of Operations [Abstract]        
Gains (Losses) Recognized in Other Comprehensive Income (Loss) (7) 17 (15) 15
Gains (Losses) Reclassified from Accumulated OCI into Net Income (15) 23 (17) 25
Foreign Exchange Contract [Member] | Gains (losses) included in Other - net [Member]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 0 (6) 0 (1)
Fair Value Hedging [Member]        
Effect of Cash Flow Hedges on Results of Operations [Abstract]        
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge (19) 15 (3) 19
Cash Flow Hedging [Member] | Currency Swap [Member] | Gains (losses) included in interest expense [Member]        
Effect of Cash Flow Hedges on Results of Operations [Abstract]        
Gains (Losses) Reclassified from Accumulated OCI into Net Income $ (3) $ (1) $ (6) $ (2)