RETIREMENT AND DEFERRED COMPENSATION PLANS - Components of Net Periodic Cost and Underlying Weighted Average Actuarial Assumptions Used for Pension and Postretirement Benefit Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits
Components of Net Periodic Benefit Cost
Service cost	$ 4	$ 4	$ 5
Interest cost	6	7	8
Expected return on assets	(8)	(7)	(8)
Amortization of actuarial (gain) loss	0	1	2
Net periodic benefit cost	$ 2	$ 5	$ 7
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost for the Years Ended December 31
Discount rate	2.70%	3.90%	3.70%
Salary increases	4.80%	4.60%	4.60%
Expected return on assets	3.40%	4.10%	3.90%
Postretirement Benefits
Components of Net Periodic Benefit Cost
Service cost	$ 2	$ 2	$ 2
Interest cost	1	1	1
Expected return on assets	0
Amortization of actuarial (gain) loss	(1)	(1)	0
Net periodic benefit cost	$ 2	$ 2	$ 3
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost for the Years Ended December 31
Discount rate	3.76%	3.95%	3.62%
Healthcare cost trend
Initial	7.00%	7.00%	7.00%
Ultimate in 2025	5.00%	5.00%	5.00%