STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
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
Treasury Stock
Treasury stock purchased	$ 175	$ 130
Treasury stock purchased (in shares)	3,887,023