EMPLOYEE RETIREMENT PLANS - Amounts in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Amounts in the company's consolidated balance sheets
Accrued liabilities	$ (48)	$ (40)
Qualified
Amounts in the company's consolidated balance sheets
Other assets	1
Accrued liabilities	(3)	(2)
Other liabilities	399	452
Total net liability	(401)	(454)
Non-Qualified
Amounts in the company's consolidated balance sheets
Accrued liabilities	(12)	(12)
Other liabilities	162	178
Total net liability	$ (174)	$ (190)