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Investments (Investments) (Details) (USD $)
In Millions, unless otherwise specified
Jul. 11, 2011
Jun. 30, 2011
Dec. 31, 2010
Sep. 30, 2009
Equity method percentage owned       50.00%
Investments accounted for under the equity method $ 155      
Investments   1,105 1,208  
Frac Tech International LLC [Member]
       
Equity method percentage owned     30.00% [1]  
Investments accounted for under the equity method   236 311  
Chesapeake Midstream Partners LP [Member]
       
Equity method percentage owned     42.00%  
Investments accounted for under the equity method   694 695  
Chaparral Energy Inc. [Member]
       
Equity method percentage owned     20.00%  
Investments accounted for under the equity method   122 133  
Gastar Exploration Ltd. [Member]
       
Equity method percentage owned     11.00%  
Investments accounted for under the cost method   23 29  
Other [Member]
       
Equity method percentage owned        
Investments accounted for under the cost method   $ 30 $ 40  
[1] Prior to the recapitalization described below, we owned approximately 26% of Frac Tech Holdings, LLC.