Annual report pursuant to Section 13 and 15(d)

STOCK INCENTIVE AND STOCK OPTION PLANS (Details 3)

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STOCK INCENTIVE AND STOCK OPTION PLANS (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Y
Dec. 31, 2009
Y
Black-Scholes option pricing model assumptions      
Expected life (in years) 5 5 5
Risk-free interest rate (as a percent) 1.87% 2.26% 2.55%
Expected volatility (as a percent) 55.39% 54.23% 50.55%
Dividend yield (as a percent) 1.30% 1.40% 1.50%
Performance Shares
      
Share-based compensation plan, other than stock options, activity      
Nonvested at the beginning of the period (in shares) 481,771 1,213,386 2,206,486
Granted (in shares) 229,436 186,947 440,168
Vested (in shares) (178,653) (704,931) (1,382,720)
Cancelled (in shares)   (200,324)  
Forfeited (in shares) (7,163) (13,307) (50,548)
Nonvested at the end of the period (in shares) 525,391 481,771 1,213,386
Weighted-average Fair Value, Nonvested at the beginning of the period (in dollars per share) 45.10 40.63 32.98
Granted (in dollars per share) 86.65 60.92 31.67
Vested (in dollars per share) 48.03 38.62 25.34
Cancelled (in dollars per share)   56.53  
Forfeited (in dollars per share) 59.15 30.98 47.40
Weighted-average Nonvested, Outstanding at the end of the period (in dollars per share) 62.05 45.10 40.63
Total fair value of equity instruments other than options vested in period (in dollars) 9 27 35
Restricted Shares
      
Share-based compensation plan, other than stock options, activity      
Nonvested at the beginning of the period (in shares) 69,890 69,866 138,130
Granted (in shares) 13,555 68,290  
Vested (in shares) (1,600) (68,266) (68,264)
Nonvested at the end of the period (in shares) 81,845 69,890 69,866
Weighted-average Fair Value, Nonvested at the beginning of the period (in dollars per share) 51.94 27.68 27.51
Granted (in dollars per share) 108.51 52.16  
Vested (in dollars per share) 42.61 27.33 27.33
Weighted-average Nonvested, Outstanding at the end of the period (in dollars per share) 61.49 51.94 27.68
Total fair value of equity instruments other than options vested in period (in dollars) 1 2 2