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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Level 3          
Rollforward of Level 3 Net Asset/(Liability)          
Beginning Balance $ (36) $ (59) $ (36) $ 11  
Net gains/(losses) for the period included in earnings 3 23 (1) 23  
Settlements     3 (9)  
Derivatives entered into during the period 3 1 4 (60)  
Ending Balance (30) (35) (30) (35)  
Change in unrealized gains/(losses) included in earnings relating to Level 3 derivatives still held at the end of the period 6 $ 24 3 $ 24  
Recurring Fair Value Measures          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (38)   (38)   $ (373)
Recurring Fair Value Measures | Commodity Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) 26   26   (288)
Recurring Fair Value Measures | Interest Rate Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (32)   (32)   (50)
Recurring Fair Value Measures | Foreign Currency Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) 3   3   (3)
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (35)   (35)   (32)
Recurring Fair Value Measures | Level 1          
Recurring Fair Value Measurements          
Net derivative asset/(liability) 7   7   (113)
Recurring Fair Value Measures | Level 1 | Commodity Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) 7   7   (113)
Recurring Fair Value Measures | Level 2          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (15)   (15)   (224)
Recurring Fair Value Measures | Level 2 | Commodity Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) 14   14   (171)
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (32)   (32)   (50)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) 3   3   (3)
Recurring Fair Value Measures | Level 3          
Recurring Fair Value Measurements          
Net derivative asset/(liability) (30)   (30)   (36)
Recurring Fair Value Measures | Level 3 | Commodity Derivatives          
Recurring Fair Value Measurements          
Net derivative asset/(liability) 5   5   (4)
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option          
Recurring Fair Value Measurements          
Net derivative asset/(liability) $ (35)   $ (35)   $ (32)