EMPLOYEE BENEFIT PLANS - AMOUNTS RECOGNIZED IN CONSOLIDATED BALANCE SHEETS (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Accrued benefit liability-long term	$ 331	$ 270
Qualified Defined Benefit [Member]
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Accrued benefit liability-long term	225	173
Plan assets-long term (within Other noncurrent assets)	(28)	(12)
Total liability recognized	197	161
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Prior service credit	(10)	(11)
Net loss	509	499
Amount recognized in AOCL (pretax)	$ 499	$ 488