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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Level 3      
Rollforward of Level 3 Net Asset/(Liability)      
Beginning Balance $ 11 $ 15  
Losses for the period included in earnings (1)    
Settlements (9) (12)  
Derivatives entered into during the period (60) 2  
Ending Balance (59) 5  
Change in unrealized gains/(losses) included in earnings relating to Level 3 derivatives still held at the end of the period (1) $ 2  
Recurring Fair Value Measures      
Recurring Fair Value Measurements      
Net derivative asset/(liability) (113)   $ 170
Recurring Fair Value Measures | Commodity Derivatives      
Recurring Fair Value Measurements      
Net derivative asset/(liability) 80   227
Recurring Fair Value Measures | Interest Rate Derivatives      
Recurring Fair Value Measurements      
Net derivative asset/(liability) (138)   (49)
Recurring Fair Value Measures | Foreign Currency Derivatives      
Recurring Fair Value Measurements      
Net derivative asset/(liability) 5   (8)
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option      
Recurring Fair Value Measurements      
Net derivative asset/(liability) (60)    
Recurring Fair Value Measures | Level 1      
Recurring Fair Value Measurements      
Net derivative asset/(liability) 62   126
Recurring Fair Value Measures | Level 1 | Commodity Derivatives      
Recurring Fair Value Measurements      
Net derivative asset/(liability) 62   126
Recurring Fair Value Measures | Level 2      
Recurring Fair Value Measurements      
Net derivative asset/(liability) (116)   33
Recurring Fair Value Measures | Level 2 | Commodity Derivatives      
Recurring Fair Value Measurements      
Net derivative asset/(liability) 17   90
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives      
Recurring Fair Value Measurements      
Net derivative asset/(liability) (138)   (49)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives      
Recurring Fair Value Measurements      
Net derivative asset/(liability) 5   (8)
Recurring Fair Value Measures | Level 3      
Recurring Fair Value Measurements      
Net derivative asset/(liability) (59)   11
Recurring Fair Value Measures | Level 3 | Commodity Derivatives      
Recurring Fair Value Measurements      
Net derivative asset/(liability) 1   $ 11
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option      
Recurring Fair Value Measurements      
Net derivative asset/(liability) $ (60)