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STOCK-BASED COMPENSATION. (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Stock options  
Outstanding at beginning of year 31,574,958
Exercised (1,148,134)
Forfeited (286,320)
Expired (696)
Outstanding at end of period 31,886,208
Exercisable at end of period 18,122,661
Stock options, weighted-average exercise price  
Weighted-average exercise price of options outstanding at beginning of year (in dollars per option) $ 52.18
Weighted-average exercise price of options exercised (in dollars per option) $ 43.39
Weighted-average exercise price of options forfeited (in dollars per option) $ 59.46
Weighted-average exercise price of options expired (in dollars per option) $ 49.77
Weighted-average exercise price of options outstanding at end of period (in dollars per option) $ 53.95
Weighted-average exercise price of options exercisable at end of period (in dollars per option) $ 47.74
Restricted shares and stock units, weighted-average fair value  
Weighted-average fair value of nonvested restricted shares and restricted stock units at December 31, 2013 (in dollars per share) $ 67.21
Weighted-average fair value of restricted shares and restricted stock units vested (in dollars per share) $ 69.01
Weighted-average fair value of restricted shares and restricted stock units forfeited (in dollars per share) $ 70.05
Weighted-average fair value of nonvested restricted shares and restricted stock units at March 31, 2014 (in dollars per share) $ 69.45
Future stock-based compensation expense  
Second quarter 2014 (dollars) $ 33.3
Third quarter 2014 (dollars) 33.4
Fourth quarter 2014 (dollars) 29.4
2015 (dollars) 82.4
2016 through 2019 (dollars) 80.4
Total (dollars) $ 258.9
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) $ 79.91
Restricted shares [Member]
 
Restricted shares and stock units  
Nonvested at December 31, 2013 1,877,086
Vested (1,087)
Forfeited (89,203)
Nonvested at March 31, 2014 2,158,547
Restricted shares [Member] | Time-based [Member]
 
Restricted shares and stock units  
Granted 365,751
Restricted shares [Member] | Performance-based [Member]
 
Restricted shares and stock units  
Nonvested at March 31, 2014 49,200
Restricted shares [Member] | Performance-based [Member] | Performance threshold met [Member]
 
Restricted shares and stock units  
Nonvested at March 31, 2014 31,200
Restricted stock units [Member]
 
Restricted shares and stock units  
Nonvested at December 31, 2013 823,593
Vested (5,283)
Forfeited (5,245)
Nonvested at March 31, 2014 1,024,969
Restricted stock units [Member] | Time-based [Member]
 
Restricted shares and stock units  
Granted 177,179
Restricted stock units [Member] | Performance-based [Member]
 
Restricted shares and stock units  
Nonvested at March 31, 2014 153,675
Restricted stock units [Member] | Performance-based [Member] | Performance threshold met [Member]
 
Restricted shares and stock units  
Nonvested at March 31, 2014 90,750
Employee global long-term incentive plan [Member] | 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) $ 79.89
Employee global long-term incentive plan [Member] | Restricted shares [Member] | Performance-based [Member]
 
Restricted shares and stock units  
Granted 6,000
Employee global long-term incentive plan [Member] | Restricted stock units [Member] | Performance-based [Member]
 
Restricted shares and stock units  
Granted 34,725
Employee global long-term incentive plan [Member] | Semiannual [Member]
 
Stock options  
Grants 1,740,900
Stock options, weighted-average exercise price  
Weighted-average exercise price of option grants (in dollars per option) $ 79.89
Employee global long-term incentive plan [Member] | New hire [Member]
 
Stock options  
Grants 5,500
Stock options, weighted-average exercise price  
Weighted-average exercise price of option grants (in dollars per option) $ 82.56