EMPLOYEE RETIREMENT PLANS - Amounts in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Amounts in the company's consolidated balance sheets
Accrued liabilities	$ (42)	$ (50)
Qualified
Amounts in the company's consolidated balance sheets
Other assets	1	1
Accrued liabilities	(1)	(1)
Other liabilities	(226)	(266)
Total net liability	(226)	(266)
Non-Qualified
Amounts in the company's consolidated balance sheets
Other assets	0	0
Accrued liabilities	(13)	(13)
Other liabilities	(142)	(157)
Total net liability	$ (155)	$ (170)