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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, 2018
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Dec. 31, 2017
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Dec. 31, 2016
USD ($)
Inventory-related disclosures      
Charge related to the write-down of inventory $ 8 $ 35 $ 3
Inventory by category      
Inventory 640 713  
Linefill and base gas 916 872  
Long-term inventory 136 164  
Total $ 1,692 $ 1,749  
Crude oil      
Inventory by category      
Inventory, Volumes (in barrels or in Mcf) | bbl 9,657 7,800  
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 13,312 12,340  
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,890 1,870  
Inventory $ 367 $ 402  
Linefill and base gas 761 719  
Long-term inventory $ 79 $ 105  
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 38.00 51.54  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 57.17 58.27  
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 41.80 56.15  
NGL      
Inventory by category      
Inventory, Volumes (in barrels or in Mcf) | bbl 10,384 10,774  
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,730 1,597  
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 2,368 2,167  
Inventory $ 262 $ 294  
Linefill and base gas 47 45  
Long-term inventory $ 57 $ 59  
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 25.23 27.29  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 27.17 28.18  
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 24.07 27.23  
Natural gas      
Inventory by category      
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf 24,976 24,976  
Linefill and base gas $ 108 $ 108  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / Mcf 4.32 4.32  
Other      
Inventory by category      
Inventory $ 11 $ 17