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Derivative Instruments and Hedging Activities - Part 3 (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Gain Loss By Type Of Derivative Tables    
Electric Production Expense $ 1,295 $ 1,456
Cash Flow Hedging [Member]    
Derivative Instruments Gain Loss [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 4 (14)
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL (85) (89)
Gains (Losses) Recognized in Earnings (ineffective portion) 2 (2)
AOCI to be recognized in next 12 months table    
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months (104)  
Cash Flow Hedging [Member] | Commodity Contract [Member]    
Derivative Instruments Gain Loss [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 22 5
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL 37 7
Cash Flow Hedging [Member] | Foreign currency derivatives [Member]    
Derivative Instruments Gain Loss [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 2 6
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL 0 2
Cash Flow Hedging [Member] | Cross currency derivatives [Member]    
Derivative Instruments Gain Loss [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 9 (1)
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL 8 0
Cash Flow Hedging [Member] | Interest Rate Contract [Member]    
Derivative Instruments Gain Loss [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (29) (24)
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL (130) (98)
Not Designated as Hedging Instrument [Member]    
Gain Loss By Type Of Derivative Tables    
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) 31 24
Not Designated as Hedging Instrument [Member] | Other Contract [Member]    
Gain Loss By Type Of Derivative Tables    
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) (9) (8)
Not Designated as Hedging Instrument [Member] | Foreign currency derivatives [Member]    
Gain Loss By Type Of Derivative Tables    
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) $ 40 $ 32