SHARE-BASED COMPENSATION - Schedule of Stock Appreciation Rights Activity (Details) - Stock appreciation rights $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares
Rights
Balance, beginning of year | shares	386
Granted | shares	0
Exercised | shares	(102)
Forfeited or expired | shares	(12)
Balance, end of year | shares	272
Exercisable, end of year | shares	168
Weighted Average Exercise Price
Balance, beginning of year | $ / shares	$ 23.82
Granted | $ / shares	0.00
Exercised | $ / shares	24.08
Forfeited or expired | $ / shares	30.39
Balance, end of year | $ / shares	23.42
Exercisable, end of year | $ / shares	$ 21.54
Average Remaining Contractual Term
Balance, end of year	5 years 2 months 23 days
Exercisable, end of year	2 years 3 months 15 days
Aggregate Intrinsic Value
Balance, end of year | $	$ 3
Exercisable, end of year | $	$ 2