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Investments Narrative (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Frac Tech Holdings, L.L.C.
Jun. 30, 2013
Chaparral Energy, Inc.
Jun. 30, 2013
Sundrop Fuels, Inc.
Jun. 30, 2013
Twin Eagle Resources Management, LLC
Jun. 30, 2013
Maalt Specialized Bulk, LLC
Jun. 30, 2013
Clean Energy Fuels Corp.
Jun. 30, 2013
Clean Energy Fuels Corp.
Dec. 31, 2012
Clean Energy Fuels Corp.
Jun. 30, 2013
Gastar Exploration Ltd.
Jun. 30, 2013
Other Investments
Jun. 30, 2013
Other Investments
Schedule of Equity Method Investments [Line Items]                              
Cost method percentage approximate owned                   0.00% 0.00%        
Other Commitment, Due in Next Twelve Months         $ 3,000,000                    
Positive equity method adjustments         5,000,000 3,000,000 10,000,000 4,000,000 0            
Equity method accretion adjustments         23,000,000                    
Excess carrying value of investment over underlying equity in net assets         344,000,000 50,000,000 53,000,000                
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Attributable to Goodwill         31,000,000         1,000,000 1,000,000        
Goodwill, Not Allocated, Amount         265,000,000                    
Property, Plant and Equipment, Useful Life         P9Y                    
Depreciation           3,000,000                  
Equity method depreciation adjustments           2,000,000                  
Cost of investment                   10,000,000 10,000,000        
Maximum common stock price per share                       $ 12.45      
Minimum common stock price per share                   $ 13.20 $ 13.20        
Losses on investments     7,000,000 120,000,000             3,000,000        
Sale of Stock, Consideration Received on Transaction                     13,000,000        
Impairment of investment 0 0 10,000,000 0           15,000,000          
Cash Proceeds From Sale of Investment                         10,000,000    
Cost Method Investments                   0 0 100,000,000      
Proceeds from Cost Method Investment                     85,000,000       6,000,000
Other Commitment 59,000,000   59,000,000             50,000,000 50,000,000        
Gains (losses) on sales of investments                           $ 5,000,000