Consolidated Balance Sheet (Parentheticals) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Common stock, par or stated value per share	$ 1	$ 1
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares, issued	195,403,644	200,859,676
Common stock, shares outstanding	189,405,244	195,772,876