Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Allowances for discounts and doubtful accounts on receivables	$ 27	$ 34
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	750.0	750.0
Common Stock, shares issued	186.3	186.2
Treasury Stock, shares	1.1	0.5