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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Level 3    
Rollforward of Level 3 Net Asset/(Liability)    
Beginning Balance $ 15 $ (3)
Gains for the period included in earnings 1  
Settlements (14) 3
Derivatives entered into during the period 9 15
Ending Balance 11 15
Change in unrealized gains included in earnings relating to Level 3 derivatives still held at the end of the period 10 15
Recurring Fair Value Measures    
Recurring Fair Value Measurements    
Net derivative asset/(liability) 170 109
Recurring Fair Value Measures | Commodity Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) 227 191
Recurring Fair Value Measures | Interest Rate Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (49) (70)
Recurring Fair Value Measures | Foreign Currency Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (8) (12)
Recurring Fair Value Measures | Level 1    
Recurring Fair Value Measurements    
Net derivative asset/(liability) 126 (85)
Recurring Fair Value Measures | Level 1 | Commodity Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) 126 (85)
Recurring Fair Value Measures | Level 2    
Recurring Fair Value Measurements    
Net derivative asset/(liability) 33 179
Recurring Fair Value Measures | Level 2 | Commodity Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) 90 261
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (49) (70)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (8) (12)
Recurring Fair Value Measures | Level 3    
Recurring Fair Value Measurements    
Net derivative asset/(liability) 11 15
Recurring Fair Value Measures | Level 3 | Commodity Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) $ 11 $ 15