EMPLOYEE RETIREMENT PLANS - Pre-tax Expense (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) plan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Pre-tax expense
Number of regional multi-employer pension plans in which the entity participates | plan	1
Pre-tax expense	$ 92	$ 84	$ 68
Defined-benefit pension plans
Pre-tax expense
Pre-tax expense	34	32	25
Defined-contribution plans
Pre-tax expense
Pre-tax expense	$ 58	$ 52	$ 43