CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Common stock, par value	$ 1.00	$ 1.00
Common stock, authorized	400,000,000	400,000,000
Common stock, issued	242,416,424	240,791,473
Treasury stock, shares	7,359,983	6,906,262