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Derivative Instruments and Hedging Activities - Part 3 (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Gain Loss By Type Of Derivative Tables        
Electric Production Expense $ 1,231 $ 1,399 $ 3,750 $ 4,348
Cash Flow Hedging [Member]        
Derivative Instruments Gain Loss [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (25) (14) (28) (52)
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL 26 (92) (177) (95)
Gains (Losses) Recognized in Earnings (ineffective portion) (2) (2) 0 (6)
AOCI to be recognized in next 12 months table        
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months [1] 133   133  
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 4 8 42 19
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL 10 10 35 25
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 (7) 12 (3) 20
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL (6) 5 (11) 6
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 4 (1) 14 (3)
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL 15 3 12 4
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 (26) (33) (81) (88)
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL 7 (110) (213) (130)
Not Designated as Hedging Instrument [Member]        
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) 1 13 (1) 44
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) 7 (10) (11) (18)
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) $ (6) $ 23 $ 10 $ 62
[1] (1) Primarily due to interest rate derivatives