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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Dec. 31, 2017
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Inventory by category      
Inventory   $ 824 $ 713
Linefill and base gas   914 872
Long-term inventory   179 164
Total   1,917 1,749
Charge related to the writedown of inventory $ 35    
Crude oil      
Inventory by category      
Inventory   389 402
Linefill and base gas   756 719
Long-term inventory   $ 112 $ 105
Inventory, Volumes (in barrels or in Mcf) | bbl   7,020 7,800
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl   13,033 12,340
Long-term inventory, Volumes (in barrels or in Mcf) | bbl   1,882 1,870
Inventory (Price/Unit of measure) | $ / bbl   55.41 51.54
Linefill and base gas (Price/Unit of measure) | $ / bbl   58.01 58.27
Long-term inventory (Price/Unit of measure) | $ / bbl   59.51 56.15
NGL      
Inventory by category      
Inventory   $ 422 $ 294
Linefill and base gas   50 45
Long-term inventory   $ 67 $ 59
Inventory, Volumes (in barrels or in Mcf) | bbl   15,122 10,774
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl   1,764 1,597
Long-term inventory, Volumes (in barrels or in Mcf) | bbl   2,351 2,167
Inventory (Price/Unit of measure) | $ / bbl   27.91 27.29
Linefill and base gas (Price/Unit of measure) | $ / bbl   28.34 28.18
Long-term inventory (Price/Unit of measure) | $ / bbl   28.50 27.23
Natural gas      
Inventory by category      
Linefill and base gas   $ 108 $ 108
Linefill and base gas, Volumes (in barrels or in Mcf) | Mcf   24,976 24,976
Linefill and base gas (Price/Unit of measure) | $ / Mcf   4.32 4.32
Other      
Inventory by category      
Inventory   $ 13 $ 17