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, 2017	Dec. 31, 2016	Dec. 31, 2015
Qualified
Changes in projected benefit obligation:
Balance at the beginning of the period	$ 1,055	$ 1,059
Service cost	3	3	$ 3
Interest cost	36	41
Actuarial (gain) loss, net	34	50
Foreign currency exchange	20	(29)
Benefit payments	(43)	(69)
Divestitures	(144)	0
Balance at the end of the period	961	1,055	1,059
Changes in fair value of plan assets:
Balance at the beginning of the period	717	658
Actual return on plan assets	77	58
Foreign currency exchange	8	(20)
Company contributions	52	100
Expenses, other	(7)	(10)
Benefit payments	(43)	(69)
Divestitures	(109)	0
Balance at the end of the period	695	717	658
Funded status at the end of the period	(266)	(338)
Non-Qualified
Changes in projected benefit obligation:
Balance at the beginning of the period	170	174
Service cost	0	0
Interest cost	6	7
Actuarial (gain) loss, net	7	1
Foreign currency exchange	0	0
Benefit payments	(13)	(12)
Divestitures	0	0
Balance at the end of the period	170	170	174
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	13	12
Expenses, other	0	0
Benefit payments	(13)	(12)
Divestitures	0	0
Balance at the end of the period	0	0	$ 0
Funded status at the end of the period	$ (170)	$ (170)