Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Allowances	$ 116	$ 83
Annual dividend rate	5.50%	5.50%
5.50% Mandatory convertible preferred stock series A, par value	$ 0.00001	$ 0.00001
5.50% Mandatory convertible preferred stock series A, shares authorized	100,000,000	100,000,000
5.50% Mandatory convertible preferred stock series A, shares issued	20,000,000	20,000,000
5.50% Mandatory convertible preferred stock series A, shares outstanding	20,000,000	20,000,000
5.50% Mandatory convertible preferred stock series A, aggregate liquidation value	$ 1,000	$ 1,000
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	819,773,724	808,851,108
Common Stock, Shares, Outstanding	818,391,219	807,468,603
Treasury stock, at cost	1,382,505	1,382,505