STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Treasury stock purchased	$ 130
Treasury stock purchased (in shares)	3,398,478
Preferred Stock
Preferred stock, authorized (in shares)	100,000,000	100,000,000
Preferred stock, outstanding (in shares)	250,000	250,000
Preferred stock, par value (in dollars per share)	$ 25.00	$ 25.00
Series A Preferred Stock
Preferred Stock
Preferred stock, authorized (in shares)	250,000	250,000
Preferred stock, par value (in dollars per share)	$ 25.00	$ 25.00
Preferred stock, issued	$ 250
Preferred stock, issued (in shares)	250,000	250,000
Preferred stock, dividend rate	5.50%
Preferred stock, liquidation preference (in dollars per share)	$ 1,000	$ 1,000
Preferred stock, redemption price per share (in dollars per share)	$ 1,000
Series A Preferred Stock | LIBOR
Preferred Stock
Preferred stock, dividend payment rate, basis spread on variable rate, beginning after April 6, 2020	3.96%