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Derivatives and Risk Management Activities - Fair Value (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Level 3    
Rollforward of Level 3 Net Asset/(Liability)    
Beginning Balance $ (36) $ 11
Net gains for the period included in earnings 12 28
Settlements 4 (10)
Derivatives entered into during the period (10) (65)
Ending Balance (30) (36)
Change in unrealized gains/(losses) included in earnings relating to Level 3 derivatives still held at the end of the period 5 (36)
Recurring Fair Value Measures    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (335) (373)
Recurring Fair Value Measures | Commodity Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (281) (288)
Recurring Fair Value Measures | Interest Rate Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (36) (50)
Recurring Fair Value Measures | Foreign Currency Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) 4 (3)
Recurring Fair Value Measures | Preferred Distribution Rate Reset Option    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (22) (32)
Recurring Fair Value Measures | Level 1    
Recurring Fair Value Measurements    
Net derivative asset/(liability) 5 (113)
Recurring Fair Value Measures | Level 1 | Commodity Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) 5 (113)
Recurring Fair Value Measures | Level 2    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (310) (224)
Recurring Fair Value Measures | Level 2 | Commodity Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (278) (171)
Recurring Fair Value Measures | Level 2 | Interest Rate Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (36) (50)
Recurring Fair Value Measures | Level 2 | Foreign Currency Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) 4 (3)
Recurring Fair Value Measures | Level 3    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (30) (36)
Recurring Fair Value Measures | Level 3 | Commodity Derivatives    
Recurring Fair Value Measurements    
Net derivative asset/(liability) (8) (4)
Recurring Fair Value Measures | Level 3 | Preferred Distribution Rate Reset Option    
Recurring Fair Value Measurements    
Net derivative asset/(liability) $ (22) $ (32)