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Derivative Instruments and Hedging Activities - Part 3 (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL $ 7 $ (62) $ 121 $ (194)
Gains (Losses) Reclassified from AOCL into Earnings (35) (32) (142) (191)
Gains (Losses) Recognized in Earnings (ineffective portion) (1) (3) 29 (3)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) 21 (4) 29 (95)
Interest rate derivatives [Member]
       
AOCI to be recognized in next 12 months table        
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months (111)   (111)  
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL 10 (62) 131 (204)
Interest rate derivatives [Member] | Interest Expense [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Reclassified from AOCL into Earnings (32) (40) (95) (102)
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring 0 11 0 11
Cash Flow Hedge Additional Transaction Period       2 months
Gains (Losses) Recognized in Earnings (ineffective portion) (1) (2) 29 (1)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) (1) (2) 1 (5)
Interest rate derivatives [Member] | Non-regulated cost of sales [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Reclassified from AOCL into Earnings (1) (1) (3) (4)
Interest rate derivatives [Member] | Net Equity In Earnings Of Affiliates [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Reclassified from AOCL into Earnings (1) (2) (5) (4)
Gains (Losses) Recognized in Earnings (ineffective portion) 0 0 0 (1)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) 0 0 (6) 0
Interest rate derivatives [Member] | Asset Impairment Expense [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Reclassified from AOCL into Earnings 0 (5) 0 (5)
Interest rate derivatives [Member] | Gain on sale of investments [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Reclassified from AOCL into Earnings     (21) (96)
Cross currency derivatives [Member]
       
AOCI to be recognized in next 12 months table        
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months 10   10  
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL 2 4 (9) 9
Cross currency derivatives [Member] | Interest Expense [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Reclassified from AOCL into Earnings (4) (3) (10) (9)
Gains (Losses) Recognized in Earnings (ineffective portion) 0 (1) 0 (1)
Cross currency derivatives [Member] | Foreign currency transaction gains (losses) [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Reclassified from AOCL into Earnings 4 15 (10) 27
Foreign currency derivatives [Member]
       
AOCI to be recognized in next 12 months table        
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months 2   2  
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL (1) 0 1 12
Foreign currency derivatives [Member] | Net Equity In Earnings Of Affiliates [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) (7) 0 (22) 0
Foreign currency derivatives [Member] | Foreign currency transaction gains (losses) [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Reclassified from AOCL into Earnings 3 4 7 4
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) 24 (11) 47 (87)
Commodity derivatives [Member]
       
AOCI to be recognized in next 12 months table        
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months (5)   (5)  
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL (4) (4) (2) (11)
Commodity derivatives [Member] | Non-regulated cost of sales [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Reclassified from AOCL into Earnings (1) 0 (1) 0
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) (2) 1 (1) 4
Commodity derivatives [Member] | Non-regulated revenue [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Reclassified from AOCL into Earnings (3) 0 (4) (2)
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) 4 (1) 8 13
Commodity derivatives [Member] | Regulated Revenue [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) 0 (3) 0 (2)
Commodity derivatives [Member] | Regulated Cost Of Sales [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) 1 (3) 12 (20)
Commodity derivatives [Member] | Income (Loss) From Operations Of Discontinued Business [Member]
       
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) $ 2 $ 15 $ (10) $ 2