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Investments - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
FTS International, Inc.
Dec. 31, 2012
FTS International, Inc.
Dec. 31, 2013
Chaparral Energy, Inc.
Dec. 31, 2012
Chaparral Energy, Inc.
Dec. 31, 2013
Sundrop Fuels, Inc.
Dec. 31, 2012
Sundrop Fuels, Inc.
Dec. 31, 2013
Clean Energy Fuels Corp.
Dec. 31, 2012
Clean Energy Fuels Corp.
Dec. 31, 2013
Gastar Exploration Ltd.
Dec. 31, 2012
Gastar Exploration Ltd.
Dec. 31, 2012
Chesapeake Midstream Partners Lp [Member]
Dec. 31, 2013
Glass Mountain Pipeline Limited Liability Company [Member]
Dec. 31, 2012
Glass Mountain Pipeline Limited Liability Company [Member]
mi
Dec. 31, 2013
Other Investment Companies [Member]
Dec. 31, 2012
Other Investment Companies [Member]
Jan. 14, 2014
Sale of Chaparral Energy [Member]
Chaparral Energy, Inc.
Dec. 31, 2013
Final Investment [Member]
Sundrop Fuels, Inc.
Schedule of Equity Method Investments [Line Items]                                        
Cost method percentage approximate owned                   0.00% 0.00%                  
Positive equity method adjustments       $ 177   $ 10   $ 16           $ 46            
Equity method accretion adjustments       14                   4            
Excess carrying value of investment over underlying equity in net assets       54   48   62                        
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Attributable to Goodwill       14                                
Goodwill, Not Allocated, Amount       282                                
Other Commitment, Due in Next Twelve Months       3                                
Depreciation           5                            
Equity method depreciation adjustments           3                            
Proceeds from Sale of Property, Plant, and Equipment                                     215  
Net gains on sales of fixed assets (302) (267) (437)                                  
Equity Method Investments       138 298 143 141 135 111                     40
Cost Method Investments                   0 100           61 58    
Proceeds from Cost Method Investment                   85                    
Impairment of investment                   15                    
Gains (losses) on sales of investments                   3         62   5      
Sale of Stock, Consideration Received on Transaction                   13   10         6      
Other Commitment                   50                    
Additional Assets Pipeline Length                               210        
Equity Method Investment, Ownership Percentage       30.00% 30.00% 20.00% 20.00% 56.00% 50.00%             50.00% 0.00% 0.00%    
Distributions From Equity Investments                           56            
Proceeds from sales of investments 115 2,000 0                     2,000   99     215  
Equity Method Investment, Realized Gain (Loss) on Disposal                           1,032            
Equity Method Investment, Deferred Gain on Sale                           $ 13            
Fair Value Method Investment Ownership Percentage                   0.00% 1.00% 0.00% 10.00%