Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Common stock, par value, in USD per share	$ 0.5	$ 0.5
Common stock, number of shares authorized	1,500,000,000	1,500,000,000
Common stock, number of shares issued	545,100,341	543,978,030
Treasury stock, number of shares	171,634,634	172,373,900