CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Common stock, par value	$ 1.00	$ 1.00	$ 1.00
Common stock, shares authorized	1,000,000,000	1,000,000,000	1,000,000,000
Common stock, shares issued	441,400,000	441,400,000	441,400,000
Treasury stock, shares	102,100,000	103,300,000	102,600,000