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Derivatives and Risk Management Activities (Details 7) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Level 3          
Rollforward of Level 3 Net Asset/(Liability)          
Beginning Balance $ 5 $ 1 $ 15 $ (3)  
Gains/(losses) for the period included in earnings 1   1    
Settlements (1)   (13) 3  
Derivatives entered into during the period 4   6 1  
Ending Balance 9 1 9 1  
Change in unrealized gains/(losses) included in earnings relating to Level 3 derivatives still held at the end of the period 5 $ 1 6 $ 1  
Recurring Fair Value Measures          
Recurring Fair Value Measures          
Net derivative asset/(liability) 92   92   $ 109
Recurring Fair Value Measures | Commodity Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) 85   85   191
Recurring Fair Value Measures | Interest Rate Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) 9   9   (70)
Recurring Fair Value Measures | Foreign Currency Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) (2)   (2)   (12)
Recurring Fair Value Measures | Level 1          
Recurring Fair Value Measures          
Net derivative asset/(liability) (18)   (18)   (85)
Recurring Fair Value Measures | Level 1 | Commodity Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) (18)   (18)   (85)
Recurring Fair Value Measures | Level 2          
Recurring Fair Value Measures          
Net derivative asset/(liability) 101   101   179
Recurring Fair Value Measures | Level 2 | Commodity Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) 94   94   261
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) 9   9   (70)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) (2)   (2)   (12)
Recurring Fair Value Measures | Level 3          
Recurring Fair Value Measures          
Net derivative asset/(liability) 9   9   15
Recurring Fair Value Measures | Level 3 | Commodity Derivatives          
Recurring Fair Value Measures          
Net derivative asset/(liability) $ 9   $ 9   $ 15