CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Common stock, par value	$ 1.00	$ 1.00
Common stock, authorized	400,000,000	400,000,000
Common stock, issued	243,085,098	242,416,424
Treasury stock, shares	7,811,017	7,359,983