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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Level 3          
Rollforward of Level 3 Net Asset/(Liability)          
Beginning Balance $ (35) $ 9 $ 11 $ 15  
Gains for the period included in earnings 17 2 41 1  
Settlements   (2) (10) (13)  
Derivatives entered into during the period 1 2 (59) 8  
Ending Balance (17) 11 (17) 11  
Change in unrealized gains included in earnings relating to Level 3 derivatives still held at the end of the period 18 $ 4 43 $ 9  
Recurring Fair Value Measures          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (262)   (262)   $ 170
Recurring Fair Value Measures | Commodity Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (66)   (66)   227
Recurring Fair Value Measures | Interest Rate Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (175)   (175)   (49)
Recurring Fair Value Measures | Foreign Currency Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (3)   (3)   (8)
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (18)   (18)    
Recurring Fair Value Measures | Level 1          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (27)   (27)   126
Recurring Fair Value Measures | Level 1 | Commodity Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (27)   (27)   126
Recurring Fair Value Measures | Level 2          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (218)   (218)   33
Recurring Fair Value Measures | Level 2 | Commodity Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (40)   (40)   90
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (175)   (175)   (49)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (3)   (3)   (8)
Recurring Fair Value Measures | Level 3          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (17)   (17)   11
Recurring Fair Value Measures | Level 3 | Commodity Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) 1   1   $ 11
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option          
Recurring Fair Value Measurements          
Net derivative asset/(liability) $ (18)   $ (18)