STOCK-BASED COMPENSATION (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-based compensation
Pre-tax compensation expense	$ 47	$ 54	$ 61
Income tax benefit	17	20	23
Tax rate (as a percent)	37.00%	37.00%	37.00%
Long-term stock awards
Stock-based compensation
Pre-tax compensation expense	37	34	35
Stock Options
Stock-based compensation
Pre-tax compensation expense	4	13	15
Phantom stock awards and stock appreciation rights
Stock-based compensation
Pre-tax compensation expense	$ 6	$ 7	$ 11