RETIREMENT BENEFITS - Components of Net Periodic Benefit Cost (Detail) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 4	$ 6	$ 16
Interest cost	65	60	65
Expected return on plan assets	(70)	(73)	(75)
Settlement	(13)	0	0
Net periodic pension cost	$ (14)	$ (7)	$ 6