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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, 2016
USD ($)
$ / Mcf
$ / bbl
bbl
Mcf
Dec. 31, 2015
USD ($)
$ / Mcf
$ / bbl
bbl
Mcf
Dec. 31, 2014
USD ($)
Inventory-related disclosures      
Charge related to the write-down of inventory $ 3 $ 117 $ 289
Gains on sale of linefill and base gas   1 8
Proceeds from sale of linefill and base gas   1 $ 24
Inventory by category      
Inventory 1,343 916  
Linefill and base gas 896 898  
Long-term inventory 193 129  
Total $ 2,432 $ 1,943  
Crude oil      
Inventory by category      
Inventory, Volumes (in barrels or in Mcf) | bbl 23,589 16,345  
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 12,273 12,298  
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 3,279 3,417  
Inventory $ 1,049 $ 608  
Linefill and base gas 710 713  
Long-term inventory $ 163 $ 106  
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 44.47 37.20  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 57.85 57.98  
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 49.71 31.02  
NGL      
Inventory by category      
Inventory, Volumes (in barrels or in Mcf) | bbl 13,497 13,907  
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,660 1,348  
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,418 1,652  
Inventory $ 242 $ 218  
Linefill and base gas 45 44  
Long-term inventory $ 30 $ 23  
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 17.93 15.68  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 27.11 32.64  
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 21.16 13.92  
Natural gas      
Inventory by category      
Inventory, Volumes (in barrels or in Mcf) | Mcf 14,540 22,080  
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf 30,812 30,812  
Inventory $ 32 $ 53  
Linefill and base gas $ 141 $ 141  
Inventory, Price/Unit of measure (in dollars per unit) | $ / Mcf 2.20 2.40  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / Mcf 4.58 4.58  
Other      
Inventory by category      
Inventory $ 20 $ 37