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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, 2015
USD ($)
$ / bbl
$ / Mcf
Mcf
bbl
Dec. 31, 2014
USD ($)
$ / bbl
$ / Mcf
Mcf
bbl
Dec. 31, 2013
USD ($)
Inventory-related disclosures      
Charge related to the write-down of inventory $ 117 $ 289 $ 7
Gains on sale of linefill and base gas   8 7
Proceeds from sale of linefill and base gas 1 24 $ 40
Inventory by category      
Inventory 916 891  
Linefill and base gas 898 930  
Long-term inventory 129 186  
Total 1,943 2,007  
Maximum      
Inventory-related disclosures      
Gains on sale of linefill and base gas 1    
Crude oil      
Inventory by category      
Inventory 608 304  
Linefill and base gas 713 744  
Long-term inventory $ 106 $ 136  
Inventory, Volumes (in barrels or in Mcf) | bbl 16,345 6,465  
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 12,298 11,810  
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 3,417 2,582  
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 37.20 47.02  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 57.98 63.00  
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 31.02 52.67  
NGL      
Inventory by category      
Inventory $ 218 $ 454  
Linefill and base gas 44 52  
Long-term inventory $ 23 $ 50  
Inventory, Volumes (in barrels or in Mcf) | bbl 13,907 13,553  
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,348 1,212  
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,652 1,681  
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 15.68 33.50  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 32.64 42.90  
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 13.92 29.74  
Natural gas      
Inventory by category      
Inventory $ 53 $ 102  
Linefill and base gas $ 141 $ 134  
Inventory, Volumes (in barrels or in Mcf) | Mcf 22,080 32,317  
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf 30,812 28,612  
Inventory, Price/Unit of measure (in dollars per unit) | $ / Mcf 2.40 3.16  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / Mcf 4.58 4.68  
Other      
Inventory by category      
Inventory $ 37 $ 31