Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED BALANCE SHEETS    
Common stock, par value (in dollars per share) $ 2.50 $ 2.50
Common stock, shares authorized 500 500
Common stock, shares issued 222.2 221.8
Treasury stock, shares 30.2 24.0
Common stock held by employee benefits trust, shares 1.8 2.1