v2.4.0.6
Incentive Program (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Minimum ownership of affiliates needed for awards 50.00%    
Number of shares issuable under 2003 incentive program, maximum 220,000,000    
Remaining shares available for award under 2003 incentive program 133,183,000    
Options and stock appreciation rights grant, minimum percentage of market value, date of grant 100.00%    
Award grant, maximum life or term, years 10    
Cash received from stock option exercises $ 924 $ 1,043 $ 752
Cash tax benefit realized for options exercised 221 89 164
Aggregate intrinsic value of stock options exercised 986 539 563
Aggregate intrinsic value of stock options exercisable 97    
Intrinsic value, outstanding stock options 98    
Non-Vested XTO Stock Options [Member]
      
Compensation cost charged against income 1 2  
Unvested converted stock options at period end 226,000    
Options that vest ratably 10,000    
Options that vest at stock prices 216,000    
Options that vest at stock prices, maximum $ 126.80    
Stock Options [Member]
      
Stock options exercisable, vesting period, years 3    
Restricted Stock [Member]
      
Long-term incentive awards 10,533,000 10,648,000 10,133,000
Award vesting period, first half of awards, years 3    
Awards granted to senior executives, vesting periods, first half of awards, years 5    
Awards granted to senior executives, vesting periods, remaining awards, years 10    
Unrecognized compensation cost 2,168    
Unrecognized compensation cost, weighted-average period of recognition, years 4.5    
Compensation cost charged against income 793 801 723
Income tax benefit recognized in income 73 81 76
Fair value of shares/awards vested 801 718 763
Cash payments, vested restricted stock units 46 42 41
Award vesting period, maximum 7    
Percent of the shares in each award vesting after three years 50.00%    
Percent of the shares in each award vesting after seven years 50.00%    
Percent of shares in each award vesting after five years 50.00%    
Percent of shares in each award vesting in later of ten years or retirement 50.00%    
Acquisition Of XTO Energy Inc [Member]
      
Long-term incentive awards   4,206,000  
Fair value of shares/awards vested   182  
Value of restricted stock granted   $ 250  
Converted stock options granted   12,393,000  
Unvested converted stock options at grant date   893,000  
Period the majority of converted XTO awards vest over in annual installments minimum, years   3