Unaudited Condensed Consolidated Balance Sheet (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	212,063,882	211,056,501
Common stock, shares outstanding	211,941,935	211,046,501