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Derivatives and Risk Management Activities (Details 7) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Level 3          
Rollforward of Level 3 Net Asset/(Liability)          
Beginning Balance $ 9 $ 1 $ 15 $ (3)  
Gains for the period included in earnings 2 1 1    
Settlements (2)   (13) 3  
Derivatives entered into during the period 2 1 8 3  
Ending Balance 11 3 11 3  
Change in unrealized gains included in earnings relating to Level 3 derivatives still held at the end of the period 4 $ 2 9 $ 3  
Recurring Fair Value Measures          
Recurring Fair Value Measures          
Net derivative asset/(liability) 117   117   $ 109
Recurring Fair Value Measures | Commodity Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) 183   183   191
Recurring Fair Value Measures | Interest Rate Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) (57)   (57)   (70)
Recurring Fair Value Measures | Foreign Currency Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) (9)   (9)   (12)
Recurring Fair Value Measures | Level 1          
Recurring Fair Value Measures          
Net derivative asset/(liability) 90   90   (85)
Recurring Fair Value Measures | Level 1 | Commodity Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) 90   90   (85)
Recurring Fair Value Measures | Level 2          
Recurring Fair Value Measures          
Net derivative asset/(liability) 16   16   179
Recurring Fair Value Measures | Level 2 | Commodity Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) 82   82   261
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) (57)   (57)   (70)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) (9)   (9)   (12)
Recurring Fair Value Measures | Level 3          
Recurring Fair Value Measures          
Net derivative asset/(liability) 11   11   15
Recurring Fair Value Measures | Level 3 | Commodity Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) $ 11   $ 11   $ 15