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Inventory, Linefill and Base Gas and Long-term Inventory (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2013
Crude oil
Sep. 30, 2013
Crude oil
Sep. 30, 2014
Crude oil
bbl
Dec. 31, 2013
Crude oil
bbl
Sep. 30, 2014
NGL
bbl
Dec. 31, 2013
NGL
bbl
Sep. 30, 2014
Natural gas
Mcf
Dec. 31, 2013
Natural gas
Mcf
Sep. 30, 2014
Other
Dec. 31, 2013
Other
Inventory by category                          
Inventory $ 1,314   $ 1,065     $ 476 $ 540 $ 699 $ 352 $ 119 $ 150 $ 20 $ 23
Linefill and base gas 903   798     715 679 54 62 134 57    
Long-term inventory 270   251     207 202 63 49        
Total 2,487   2,114                    
Inventory, Volumes (in barrels or in Mcf)           5,665,000 6,951,000 17,392,000 8,061,000 29,245,000 40,505,000    
Linefill and base gas, Volumes (in barrels or in Mcf)           11,390,000 10,966,000 1,214,000 1,341,000 28,612,000 16,615,000    
Long-term inventory, Volumes (in barrels or in Mcf)           2,557,000 2,498,000 1,681,000 1,161,000        
Inventory, Price/Unit of measure (in dollars per unit)           84.02 77.69 40.19 43.67 4.07 3.70    
Linefill and base gas, Price/Unit of measure (in dollars per unit)           62.77 61.92 44.48 46.23 4.68 3.43    
Long-term inventory, Price/Unit of measure (in dollars per unit)           80.95 80.86 37.48 42.20        
Inventory-related disclosures                          
Charge related to the write-down of inventory $ 37 $ 7   $ 7 $ 7         $ 37