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Derivatives and Risk Management Activities (Details 7) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Level 3
       
Roll forward of Level 3 Net Asset        
Beginning Balance     $ 4 $ 12
Total gains/(losses) for the period:        
Included in earnings     (1) (3)
Included in other comprehensive income       3
Settlements     (3) (22)
Derivatives entered into during the period     (3) 23
Transfers out of Level 3 (liability)   5    
Transfers out of Level 3 (asset)       (9)
Ending Balance     (3) 4
Transfers out of Level 3 (asset) 14      
Change in unrealized gains/(losses) included in earnings relating to level 3 derivatives still held at the end of the periods     (4) 24
Recurring Fair Value Measures | Level 1
       
Recurring Fair Value Measures        
Net derivative asset/(liability)     16 1
Recurring Fair Value Measures | Level 1 | Commodity
       
Recurring Fair Value Measures        
Net derivative asset/(liability)     16 1
Recurring Fair Value Measures | Level 2
       
Recurring Fair Value Measures        
Net derivative asset/(liability)     (37) (3)
Recurring Fair Value Measures | Level 2 | Commodity
       
Recurring Fair Value Measures        
Net derivative asset/(liability)     (59) 35
Recurring Fair Value Measures | Level 2 | Interest Rate Contracts
       
Recurring Fair Value Measures        
Net derivative asset/(liability)     26 (38)
Recurring Fair Value Measures | Level 2 | Foreign currency derivatives
       
Recurring Fair Value Measures        
Net derivative asset/(liability)     (4)  
Recurring Fair Value Measures | Level 3
       
Recurring Fair Value Measures        
Net derivative asset/(liability)     (3) 4
Recurring Fair Value Measures | Level 3 | Commodity
       
Recurring Fair Value Measures        
Net derivative asset/(liability)     (3) 4
Recurring Fair Value Measures | Total
       
Recurring Fair Value Measures        
Net derivative asset/(liability)     (24) 2
Recurring Fair Value Measures | Total | Commodity
       
Recurring Fair Value Measures        
Net derivative asset/(liability)     (46) 40
Recurring Fair Value Measures | Total | Interest Rate Contracts
       
Recurring Fair Value Measures        
Net derivative asset/(liability)     26 (38)
Recurring Fair Value Measures | Total | Foreign currency derivatives
       
Recurring Fair Value Measures        
Net derivative asset/(liability)     $ (4)