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STOCK-BASED COMPENSATION. (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Stock options  
Outstanding at beginning of year 34,622,435
Exercised (3,607,561)
Forfeited (507,486)
Expired (1,217)
Outstanding at end of period 32,289,849
Exercisable at end of period 16,771,740
Stock options, weighted-average exercise price  
Weighted-average exercise price of options outstanding at beginning of year (in dollars per option) $ 48.82
Weighted-average exercise price of options exercised (in dollars per option) $ 44.53
Weighted-average exercise price of options forfeited (in dollars per option) $ 54.64
Weighted-average exercise price of options expired (in dollars per option) $ 53.22
Weighted-average exercise price of options outstanding at end of period (in dollars per option) $ 50.45
Weighted-average exercise price of options exercisable at end of period (in dollars per option) $ 45.72
Restricted shares and stock units, weighted-average fair value  
Weighted-average fair value of nonvested restricted shares and restricted stock units at beginning of year (in dollars per share) $ 59.13
Weighted-average fair value of restricted shares and restricted stock units vested (in dollars per share) $ 60.33
Weighted-average fair value of restricted shares and restricted stock units forfeited (in dollars per share) $ 60.82
Weighted-average fair value of nonvested restricted shares and restricted stock units at end of period (in dollars per share) $ 62.32
Future stock-based compensation expense  
Third quarter 2013 (dollars) $ 28.2
Fourth quarter 2013 (dollars) 23.8
2014 (dollars) 68.9
2015 through 2018 (dollars) 66.3
Total (dollars) $ 187.2
Time-based [Member]
 
Restricted shares and stock units, weighted-average fair value  
Weighted-average fair value of restricted shares and restricted stock units granted (in dollars per share) $ 71.43
Performance-based [Member]
 
Restricted shares and stock units, weighted-average fair value  
Weighted-average fair value of restricted shares and restricted stock units granted (in dollars per share) $ 71.41
Restricted shares [Member]
 
Restricted shares and stock units  
Nonvested at beginning of year 1,161,164
Vested (9,048)
Forfeited (51,167)
Nonvested at end of period 1,500,406
Restricted shares [Member] | Time-based [Member]
 
Restricted shares and stock units  
Granted 387,457
Restricted shares [Member] | Performance-based [Member]
 
Restricted shares and stock units  
Granted 12,000
Nonvested at end of period 36,000
Restricted shares [Member] | Performance-based [Member] | Performance Conditions Met [Member]
 
Restricted shares and stock units  
Nonvested at end of period 12,000
Restricted stock units [Member]
 
Restricted shares and stock units  
Nonvested at beginning of year 597,042
Vested (10,063)
Forfeited (11,102)
Nonvested at end of period 777,600
Restricted stock units [Member] | Time-based [Member]
 
Restricted shares and stock units  
Granted 167,673
Restricted stock units [Member] | Performance-based [Member]
 
Restricted shares and stock units  
Granted 34,050
Nonvested at end of period 104,925
Restricted stock units [Member] | Performance-based [Member] | Performance Conditions Met [Member]
 
Restricted shares and stock units  
Nonvested at end of period 36,750
Employee global long-term incentive plan [Member] | Semiannual [Member]
 
Stock options  
Grants 1,766,900
Stock options, weighted-average exercise price  
Weighted-average exercise price of option grants (in dollars per option) $ 71.41
Employee global long-term incentive plan [Member] | New hire and reload [Member]
 
Stock options  
Grants 12,578
Stock options, weighted-average exercise price  
Weighted-average exercise price of option grants (in dollars per option) $ 73.49
Non-employee director [Member]
 
Stock options  
Grants 4,200
Stock options, weighted-average exercise price  
Weighted-average exercise price of option grants (in dollars per option) $ 71.48