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, 2019	Dec. 31, 2018	Dec. 31, 2017
Qualified Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at January 1	$ 896	$ 961
Service cost	3	3	$ 3
Interest cost	33	30
Actuarial loss (gain), net	(149)	48
Foreign currency exchange	3	7
Benefit payments	44	43
Projected benefit obligation at December 31	1,034	896	961
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1	670	695
Actual return on plan assets	105	(25)
Foreign currency exchange	1	4
Company contributions	56	52
Expenses, other	6	5
Benefit payments	44	43
Fair value of plan assets at December 31	780	670	695
Funded status at December 31	(254)	(226)
Nonqualified Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at January 1	155	170
Service cost	0	0	0
Interest cost	6	6
Actuarial loss (gain), net	(13)	9
Foreign currency exchange	0	0
Benefit payments	13	12
Projected benefit obligation at December 31	161	155	170
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1	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
Fair value of plan assets at December 31	0	0	$ 0
Funded status at December 31	$ (161)	$ (155)