EMPLOYEE BENEFIT PLANS - Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock option activity
Outstanding at the end of the period (in shares)	1,435,921
Assumptions used to calculate fair value of awards granted to top eleven employees
Stock based awards granted	0
Stock Options
Stock option activity
Outstanding at the beginning of the period (in shares)	1,606,842	1,984,149	3,308,111
Exercised (in shares)	(111,715)	(340,869)	(699,910)
Forfeited/Expired (in shares)	(59,206)	(36,438)	(624,052)
Outstanding at the end of the period (in shares)	1,435,921	1,606,842	1,984,149
Vested and expected to vest at the end of the period (in shares)	1,435,921
Exercisable at the end of the period (in shares)	1,435,921
Weighted Average Exercise Price Per Share
Outstanding at the beginning of the period (in dollars per share)	$ 22.87	$ 24.42	$ 30.79
Exercised (in dollars per share)	17.88	29.85	33.53
Forfeited/Expired (in dollars per share)	18.68	42.08	47.97
Outstanding at the end of the period (in dollars per share)	22.87	$ 22.87	$ 24.42
Vested and expected to vest at the end of the period (in dollars per share)	22.87
Exercisable at the end of the period (in dollars per share)	$ 22.87
Aggregate Intrinsic Value
Outstanding at the end of the period	$ 2
Vested and expected to vest at the end of the period	2
Exercisable at the end of the period	$ 2
Weighted Average Remaining Life
Outstanding at the end of the period	2 years 1 month 6 days
Vested and expected to vest at the end of the period	2 years 1 month 6 days
Exercisable at the end of the period	2 years 1 month 6 days
Other Disclosures
Aggregate Intrinsic value of awards exercised	$ 1	$ 8