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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Dec. 31, 2016
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Dec. 31, 2015
USD ($)
Inventory-related disclosures      
Charge related to the write-down of inventory $ 35 $ 3 $ 117
Inventory by category      
Inventory 713 1,343  
Linefill and base gas 872 896  
Long-term inventory 164 193  
Total $ 1,749 $ 2,432  
Crude oil      
Inventory by category      
Inventory, Volumes (in barrels or in Mcf) | bbl 7,800 23,589  
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 12,340 12,273  
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,870 3,279  
Inventory $ 402 $ 1,049  
Linefill and base gas 719 710  
Long-term inventory $ 105 $ 163  
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 51.54 44.47  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 58.27 57.85  
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 56.15 49.71  
NGL      
Inventory by category      
Inventory, Volumes (in barrels or in Mcf) | bbl 10,774 13,497  
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,597 1,660  
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 2,167 1,418  
Inventory $ 294 $ 242  
Linefill and base gas 45 45  
Long-term inventory $ 59 $ 30  
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 27.29 17.93  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 28.18 27.11  
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 27.23 21.16  
Natural gas      
Inventory by category      
Inventory, Volumes (in barrels or in Mcf) | Mcf 0 14,540  
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf 24,976 30,812  
Inventory $ 0 $ 32  
Linefill and base gas $ 108 $ 141  
Inventory, Price/Unit of measure (in dollars per unit) | $ / Mcf 0.00 2.20  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / Mcf 4.32 4.58  
Other      
Inventory by category      
Inventory $ 17 $ 20