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Derivatives and Risk Management Activities - Financial Impact (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income $ 89 $ 36
Commodity Derivatives | Supply and Logistics segment revenues    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income 96 32
Commodity Derivatives | Transportation segment revenues    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income   2
Commodity Derivatives | Field operating costs    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income (3) (2)
Interest Rate Derivatives | Interest expense, net    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income (2) (2)
Foreign Currency Derivatives | Supply and Logistics segment revenues    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income 2 6
Preferred Distribution Rate Reset Option | Other income/(expense), net    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income (4)  
Derivatives in Hedging Relationships    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income (2) (1)
Derivatives in Hedging Relationships | Commodity Derivatives | Supply and Logistics segment revenues    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income   1
Derivatives in Hedging Relationships | Interest Rate Derivatives | Interest expense, net    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income (2) (2)
Derivatives Not Designated as a Hedge    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income 91 37
Derivatives Not Designated as a Hedge | Commodity Derivatives | Supply and Logistics segment revenues    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income 96 31
Derivatives Not Designated as a Hedge | Commodity Derivatives | Transportation segment revenues    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income   2
Derivatives Not Designated as a Hedge | Commodity Derivatives | Field operating costs    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income (3) (2)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Supply and Logistics segment revenues    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income 2 $ 6
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other income/(expense), net    
Impact of derivative activities recognized in earnings    
Total gain/(loss) on derivatives recognized in net income $ (4)