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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Level 3          
Rollforward of Level 3 Net Asset/(Liability)          
Beginning Balance $ (59) $ 5 $ 11 $ 15  
Gains for the period included in earnings 23 1 23 1  
Settlements   (1) (9) (13)  
Derivatives entered into during the period 1 4 (60) 6  
Ending Balance (35) 9 (35) 9  
Change in unrealized gains included in earnings relating to Level 3 derivatives still held at the end of the period 24 $ 5 24 $ 6  
Recurring Fair Value Measures          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (343)   (343)   $ 170
Recurring Fair Value Measures | Commodity Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (152)   (152)   227
Recurring Fair Value Measures | Interest Rate Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (155)   (155)   (49)
Recurring Fair Value Measures | Foreign Currency Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (1)   (1)   (8)
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (35)   (35)    
Recurring Fair Value Measures | Level 1          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (133)   (133)   126
Recurring Fair Value Measures | Level 1 | Commodity Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (133)   (133)   126
Recurring Fair Value Measures | Level 2          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (175)   (175)   33
Recurring Fair Value Measures | Level 2 | Commodity Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (19)   (19)   90
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (155)   (155)   (49)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (1)   (1)   (8)
Recurring Fair Value Measures | Level 3          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (35)   (35)   11
Recurring Fair Value Measures | Level 3 | Commodity Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability)         $ 11
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option          
Recurring Fair Value Measurements          
Net derivative asset/(liability) $ (35)   $ (35)