EQUITY (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended			1 Months Ended
	Apr. 30, 2012	Mar. 31, 2013	Mar. 31, 2012	Oct. 31, 2012	Apr. 30, 2012 6.25%, due 2018	Mar. 31, 2013 6.25%, due 2018	Dec. 31, 2012 6.25%, due 2018	Mar. 31, 2013 8%, due 2020	Dec. 31, 2012 8%, due 2020	Apr. 30, 2012 8%, due 2020	Oct. 02, 2012 Convertible Preferred Stock
Class of Stock
Preferred stock 7% mandatory convertible shares retired	298,700
Preferred stock, percent of mandatory convertible shares		7.00%
Repurchases of preferred stock	$ 289
Principal amount of notes issued					141					150
Cash proceeds					142
Interest rate, stated percentage						6.25%	6.25%	8.00%	8.00%
Preferred stock dividends paid		$ 0	$ 6
Number of common stock received after mandatory convertible preferred stock				46,300							1,978,633