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Inventory, Linefill and Base Gas and Long-term Inventory (Details)
bbl in Thousands, Mcf in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Dec. 31, 2017
USD ($)
$ / Mcf
$ / bbl
Mcf
bbl
Inventory by category        
Inventory     $ 636 $ 713
Linefill and base gas     866 872
Long-term inventory     169 164
Total     1,671 1,749
Charge related to the writedown of inventory $ 35 $ 35    
Crude oil        
Inventory by category        
Inventory     359 402
Linefill and base gas     716 719
Long-term inventory     $ 113 $ 105
Inventory, Volumes (in barrels or in Mcf) | bbl     5,188 7,800
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl     12,410 12,340
Long-term inventory, Volumes (in barrels or in Mcf) | bbl     1,903 1,870
Inventory (Price/Unit of measure) | $ / bbl     69.20 51.54
Linefill and base gas (Price/Unit of measure) | $ / bbl     57.70 58.27
Long-term inventory (Price/Unit of measure) | $ / bbl     59.38 56.15
NGL        
Inventory by category        
Inventory     $ 262 $ 294
Linefill and base gas     42 45
Long-term inventory     $ 56 $ 59
Inventory, Volumes (in barrels or in Mcf) | bbl     10,583 10,774
Linefill and base gas, Volumes (in barrels or in Mcf) | bbl     1,562 1,597
Long-term inventory, Volumes (in barrels or in Mcf) | bbl     2,352 2,167
Inventory (Price/Unit of measure) | $ / bbl     24.76 27.29
Linefill and base gas (Price/Unit of measure) | $ / bbl     26.89 28.18
Long-term inventory (Price/Unit of measure) | $ / bbl     23.81 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     $ 15 $ 17