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Restricted Stock Units Outstanding, Including Reinvested Dividends (Detail) (Long Term Incentive Performance Award, Restricted Units, USD $)
In Millions, except Share data in Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Year
Dec. 31, 2010
Dec. 31, 2009
Long Term Incentive Performance Award | Restricted Units
     
Shares      
Beginning Balance 20,029    
Vested (8,329)    
Granted 3,895    
Reinvested Dividends 631    
Forfeited / Expired (387)    
Ending Balance 15,839 20,029  
Restricted Units Expected to Vest 15,226    
Weighted Average Grant Date Fair Value      
Beginning Balance $ 62.46    
Vested $ 64.68    
Granted $ 69.53 $ 66.36 $ 56.33
Reinvested Dividends       
Forfeited / Expired $ 62.20    
Ending Balance $ 62.98 $ 62.46  
Restricted Units Expected to Vest $ 62.90    
Weighted Average Remaining Contractual Term (in years)      
Nonvested at December 31, 2011 1.62    
Restricted Units Expected to Vest 1.60    
Aggregate Intrinsic Value      
Nonvested at December 31, 2011 $ 1,159    
Restricted Units Expected to Vest $ 1,114