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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Level 3    
Rollforward of Level 3 Net Asset/(Liability)    
Beginning Balance $ 11 $ 15
Net gains for the period included in earnings 28 1
Settlements (10) (14)
Derivatives entered into during the period (65) 9
Ending Balance (36) 11
Change in unrealized gains/(losses) included in earnings relating to Level 3 derivatives still held at the end of the period (36) 10
Recurring Fair Value Measures    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (373) 170
Recurring Fair Value Measures | Commodity Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (288) 227
Recurring Fair Value Measures | Interest Rate Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (50) (49)
Recurring Fair Value Measures | Foreign Currency Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (3) (8)
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (32)  
Recurring Fair Value Measures | Level 1    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (113) 126
Recurring Fair Value Measures | Level 1 | Commodity Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (113) 126
Recurring Fair Value Measures | Level 2    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (224) 33
Recurring Fair Value Measures | Level 2 | Commodity Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (171) 90
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (50) (49)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (3) (8)
Recurring Fair Value Measures | Level 3    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (36) 11
Recurring Fair Value Measures | Level 3 | Commodity Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (4) $ 11
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option    
Recurring Fair Value Measurements    
Net derivative asset/(liability) $ (32)