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Inventory, Linefill, Base Gas and Long-term Inventory (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Inventory-related disclosures    
Ratio for conversion of natural gas volumes to barrels 6:1 6:1
Inventory by category    
Inventory $ 1,452 $ 1,491
Linefill and base gas 549 519
Long-term inventory 136 154
Total 2,137 2,164
Crude oil
    
Inventory by category    
Inventory 1,108 1,100
Linefill and base gas 504 478
Long-term inventory 128 128
Inventory, Volumes (in barrels or cubic feet) 11,581,000 14,132,000
Linefill and base gas, Volumes (in barrels or cubic feet) 9,227,000 9,159,000
Long-term inventory, Volumes (in barrels or cubic feet) 1,727,000 1,761,000
Inventory, Price/Unit of measure (in dollars per unit) 95.67 77.84
Linefill and base gas, Price/Unit of measure (in dollars per unit) 54.62 52.19
Long-term inventory, Price/Unit of measure (in dollars per unit) 74.12 72.69
LPG
    
Inventory by category    
Inventory 326 366
Linefill and base gas 3 4
Long-term inventory 8 26
Inventory, Volumes (in barrels or cubic feet) 5,077,000 7,395,000
Linefill and base gas, Volumes (in barrels or cubic feet) 56,000 77,000
Long-term inventory, Volumes (in barrels or cubic feet) 150,000 505,000
Inventory, Price/Unit of measure (in dollars per unit) 64.21 49.49
Linefill and base gas, Price/Unit of measure (in dollars per unit) 53.57 51.95
Long-term inventory, Price/Unit of measure (in dollars per unit) 53.33 51.49
Natural gas
    
Inventory-related disclosures    
Number used to divide into natural gas volumes to convert to barrels 6 6
Inventory by category    
Inventory 13  
Linefill and base gas 42 37
Inventory, Volumes (in barrels or cubic feet) 3,006,000 13,000
Linefill and base gas, Volumes (in barrels or cubic feet) 12,425,000 11,194,000
Inventory, Price/Unit of measure (in dollars per unit) 4.32 3.87
Linefill and base gas, Price/Unit of measure (in dollars per unit) 3.38 3.31
Other
    
Inventory by category    
Inventory $ 5 $ 25