RETIREMENT AND DEFERRED COMPENSATION PLANS - Changes in Benefit Obligation, Fair Value of Plan Assets and Funded Status of Pension and Postretirement Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in Plan Assets
Fair value of plan assets at beginning of year	$ 228
Fair value of plan assets at end of year	262	$ 228
Pension Benefits
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year	199	187	$ 216
Service cost	3	3	4
Interest cost	4	5	5
Foreign currency exchange rates	8	7	(11)
Actuarial losses (gains)	30	15	(11)
Plan settlements	0	(14)	(11)
Benefits paid	(11)	(4)	(5)
Retiree contributions	0	0	0
Projected benefit obligation at end of year	233	199	187
Change in Plan Assets
Fair value of plan assets at beginning of year	228	208	238
Actual return on plan assets	31	25	(6)
Foreign currency exchange rates	9	8	(13)
Employer contributions	5	5	5
Plan settlements	0	(14)	(11)
Benefits paid	(11)	(4)	(5)
Retiree contributions	0	0	0
Fair value of plan assets at end of year	262	228	208
Funded status at end of year	29	29	21
Amounts recognized in Consolidated Balance Sheet
Current liability	0	0	0
Non-current asset	29	29	21
Amounts recognized in Consolidated Balance Sheet	29	29	21
Pre-tax Amounts Recognized in Accumulated Other Comprehensive Income (Loss)
Accumulated gain (loss)	$ (11)	$ (7)	$ (13)
Weighted Average Assumptions used as of December 31
Discount rate	1.40%	2.10%	2.90%
Salary increases	4.50%	4.30%	4.70%
Expected return on assets	2.20%	2.20%	2.80%
Postretirement Benefits
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year	$ 20	$ 27	$ 27
Service cost	1	2	2
Interest cost	0	1	1
Foreign currency exchange rates	0	0	0
Actuarial losses (gains)	1	(9)	(2)
Plan settlements	0	0	0
Benefits paid	(4)	(2)	(3)
Retiree contributions	2	1	2
Projected benefit obligation at end of year	20	20	27
Change in Plan Assets
Fair value of plan assets at beginning of year	0	0	0
Actual return on plan assets	0	0	0
Foreign currency exchange rates	0	0	0
Employer contributions	2	1	2
Plan settlements	0	0	0
Benefits paid	(4)	(2)	(4)
Retiree contributions	2	1	2
Fair value of plan assets at end of year	0	0	0
Funded status at end of year	(20)	(20)	(27)
Amounts recognized in Consolidated Balance Sheet
Current liability	(2)	(2)	(2)
Non-current liability	(18)	(18)	(25)
Amounts recognized in Consolidated Balance Sheet	(20)	(20)	(27)
Pre-tax Amounts Recognized in Accumulated Other Comprehensive Income (Loss)
Accumulated gain (loss)	$ 16	$ 19	$ 10
Weighted Average Assumptions used as of December 31
Discount rate	2.06%	3.00%	4.13%
Healthcare cost trend
Initial	6.00%	6.25%	6.50%
Ultimate in 2025	5.00%	5.00%	5.00%