EMPLOYEE RETIREMENT PLANS - Changes in the Projected Benefit Obligation and Fair Value of Plan Assets, and the Funded Status of Defined-benefit Pension Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Qualified
Changes in projected benefit obligation:
Balance at the beginning of the period	$ 961	$ 1,055
Service cost	3	3	$ 3
Interest cost	30	36
Actuarial (gain) loss, net	(48)	34
Foreign currency exchange	(7)	20
Benefit payments	(43)	(43)
Divestitures	0	(144)
Balance at the end of the period	896	961	1,055
Changes in fair value of plan assets:
Balance at the beginning of the period	695	717
Actual return on plan assets	(25)	77
Foreign currency exchange	(4)	8
Company contributions	52	52
Expenses, other	(5)	(7)
Benefit payments	(43)	(43)
Divestitures	0	(109)
Balance at the end of the period	670	695	717
Funded status at the end of the period	(226)	(266)
Non-Qualified
Changes in projected benefit obligation:
Balance at the beginning of the period	170	170
Service cost	0	0	0
Interest cost	6	6
Actuarial (gain) loss, net	(9)	7
Foreign currency exchange	0	0
Benefit payments	(12)	(13)
Divestitures	0	0
Balance at the end of the period	155	170	170
Changes in fair value of plan assets:
Balance at the beginning of the period	0	0
Actual return on plan assets	0	0
Foreign currency exchange	0	0
Company contributions	12	13
Expenses, other	0	0
Benefit payments	(12)	(13)
Divestitures	0	0
Balance at the end of the period	0	0	$ 0
Funded status at the end of the period	$ (155)	$ (170)