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Derivatives and Risk Management Activities - Financial Impact (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Impact of derivative activities recognized in earnings      
Total gain (loss) on derivatives recognized in net income $ (324) $ 156 $ 153
Loss on cash flow hedge ineffectiveness 4 0 0
Commodity Derivatives | Supply and Logistics segment revenues      
Impact of derivative activities recognized in earnings      
Total gain (loss) on derivatives recognized in net income (342) 208 205
Commodity Derivatives | Transportation segment revenues      
Impact of derivative activities recognized in earnings      
Total gain (loss) on derivatives recognized in net income 5 8  
Commodity Derivatives | Field operating costs      
Impact of derivative activities recognized in earnings      
Total gain (loss) on derivatives recognized in net income   (18) (21)
Interest Rate Derivatives | Interest expense      
Impact of derivative activities recognized in earnings      
Total gain (loss) on derivatives recognized in net income (14) (11) (5)
Foreign Currency Derivatives | Supply and Logistics segment revenues      
Impact of derivative activities recognized in earnings      
Total gain (loss) on derivatives recognized in net income (3) (31) (28)
Foreign Currency Derivatives | Other income/(expense), net      
Impact of derivative activities recognized in earnings      
Total gain (loss) on derivatives recognized in net income     2
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 30    
Derivatives in Hedging Relationships      
Impact of derivative activities recognized in earnings      
Total gain (loss) on derivatives recognized in net income (12) 45 (4)
Derivatives in Hedging Relationships | Supply and Logistics segment revenues      
Impact of derivative activities recognized in earnings      
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring, net 2    
Derivatives in Hedging Relationships | Interest expense      
Impact of derivative activities recognized in earnings      
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring, net 2 4  
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 2 56 (1)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Interest expense      
Impact of derivative activities recognized in earnings      
Total gain (loss) on derivatives recognized in net income (14) (11) (5)
Derivatives in Hedging Relationships | Foreign Currency Derivatives | Other income/(expense), net      
Impact of derivative activities recognized in earnings      
Total gain (loss) on derivatives recognized in net income     2
Derivatives Not Designated as a Hedge      
Impact of derivative activities recognized in earnings      
Total gain (loss) on derivatives recognized in net income (312) 111 157
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 (344) 152 206
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 5 8  
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   (18) (21)
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 (3) $ (31) $ (28)
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 $ 30