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, 2012
Dec. 31, 2011
Dec. 31, 2010
Black-Scholes option pricing model assumptions      
Expected life 5 years 5 years 5 years
Risk-free interest rate (as a percent) 1.05% 1.87% 2.26%
Expected volatility (as a percent) 58.98% 55.39% 54.23%
Dividend yield (as a percent) 1.30% 1.30% 1.40%
Performance Shares
      
Share-based compensation plan, other than stock options, activity      
Nonvested at the beginning of the period (in shares) 525,391 481,771 1,213,386
Granted (in shares) 325,590 229,436 186,947
Vested (in shares) (194,484) (178,653) (704,931)
Cancelled (in shares)     (200,324)
Forfeited (in shares) (26,413) (7,163) (13,307)
Nonvested at the end of the period (in shares) 630,084 525,391 481,771
Weighted-average Fair Value, Nonvested at the beginning of the period (in dollars per share) 62.05 45.10 40.63
Granted (in dollars per share) 89.92 86.65 60.92
Vested (in dollars per share) 25.46 48.03 38.62
Cancelled (in dollars per share)     56.53
Forfeited (in dollars per share) 91.94 59.15 30.98
Weighted-average Nonvested, Outstanding at the end of the period (in dollars per share) 86.49 62.05 45.10
Total fair value of equity instruments other than options vested in period (in dollars) 24 17 42
Restricted Shares
      
Share-based compensation plan, other than stock options, activity      
Nonvested at the beginning of the period (in shares) 81,845 69,890 69,866
Granted (in shares) 3,150 13,555 68,290
Vested (in shares) (22,766) (1,600) (68,266)
Nonvested at the end of the period (in shares) 62,229 81,845 69,890
Weighted-average Fair Value, Nonvested at the beginning of the period (in dollars per share) 61.49 51.94 27.68
Granted (in dollars per share) 91.68 108.51 52.16
Vested (in dollars per share) 52.16 42.61 27.33
Weighted-average Nonvested, Outstanding at the end of the period (in dollars per share) 66.43 61.49 51.94
Total fair value of equity instruments other than options vested in period (in dollars) 3 1 4