Unaudited Condensed Consolidated Balance Sheet (Parenthetical) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	228,083,679	224,665,395
Common stock, shares outstanding	213,973,997	222,955,853