EMPLOYEE RETIREMENT PLANS - Amounts in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Amounts in the company's consolidated balance sheets
Accrued liabilities	$ (52)	$ (48)
Qualified
Amounts in the company's consolidated balance sheets
Other assets	2	1
Accrued liabilities	(1)	(3)
Other liabilities	(339)	(399)
Total net liability	(338)	(401)
Non-Qualified
Amounts in the company's consolidated balance sheets
Other assets	0	0
Accrued liabilities	(12)	(12)
Other liabilities	(158)	(162)
Total net liability	$ (170)	$ (174)