v2.4.0.6
Incentive Program (Grant Value Of Restricted Stock And Units) (Details) (Restricted Stock [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Restricted Stock [Member]
     
Incentive Program [Line Items]      
Grant price, per share $ 79.52 $ 66.07 $ 75.40
Restricted stock and units settled in stock $ 766 $ 672 $ 711
Merger-related granted and converted XTO awards   250  
Units settled in cash 72 60 53
Total value $ 838 $ 982 $ 764