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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, 2019
USD ($)
$ / bbl
$ / Mcf
bbl
Mcf
Dec. 31, 2018
USD ($)
$ / bbl
$ / Mcf
bbl
Mcf
Dec. 31, 2017
USD ($)
Inventory-related disclosures      
Charge related to the write-down of inventory $ 11 $ 8 $ 35
Inventory by category      
Inventory 604 640  
Linefill and base gas 981 916  
Long-term inventory 182 136  
Total $ 1,767 $ 1,692  
Crude oil      
Inventory by category      
Inventory, Volumes (in barrels or in Mcf) | bbl 8,613 9,657  
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 14,316 13,312  
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 2,598 1,890  
Inventory $ 450 $ 367  
Linefill and base gas 826 761  
Long-term inventory $ 152 $ 79  
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 52.25 38.00  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 57.70 57.17  
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 58.51 41.80  
NGL      
Inventory by category      
Inventory, Volumes (in barrels or in Mcf) | bbl 7,574 10,384  
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl 1,701 1,730  
Long-term inventory, Volumes (in barrels or in Mcf) | bbl 1,707 2,368  
Inventory $ 142 $ 262  
Linefill and base gas 47 47  
Long-term inventory $ 30 $ 57  
Inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 18.75 25.23  
Linefill and base gas, Price/Unit of measure (in dollars per unit) | $ / bbl 27.63 27.17  
Long-term inventory, Price/Unit of measure (in dollars per unit) | $ / bbl 17.57 24.07  
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 $ 12 $ 11