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, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in Plan Assets
Fair value of plan assets at beginning of year	$ 208
Fair value of plan assets at end of year	$ 228	$ 208
Weighted Average Assumptions used as of December 31
Salary increases	4.30%	4.70%	4.70%
Expected return on assets	2.80%	2.80%	2.90%
Healthcare cost trend
Ultimate in 2025	5.00%	5.00%	5.00%
Pension Benefits
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year	$ 187	$ 216	$ 202
Service cost	3	4	4
Interest cost	5	5	6
Foreign currency exchange rates	7	(11)	20
Actuarial losses (gains)	15	(11)	(4)
Plan settlements	(14)	(11)	0
Benefits paid	(4)	(5)	(12)
Retiree contributions	0	0	0
Projected benefit obligation at end of year	199	187	216
Change in Plan Assets
Fair value of plan assets at beginning of year	208	238	206
Actual return on plan assets	25	(6)	17
Foreign currency exchange rates	8	(13)	22
Employer contributions	5	5	5
Plan settlements	(14)	(11)	0
Benefits paid	(4)	(5)	(12)
Retiree contributions	0	0	0
Fair value of plan assets at end of year	228	208	238
Funded status at end of year	29	21	22
Amounts recognized in Consolidated Balance Sheet
Current liability	0	0	0
Non-current asset	29	21	22
Amounts recognized in Consolidated Balance Sheet	29	21	22
Pre-tax Amounts Recognized in Accumulated Other Comprehensive Income (Loss)
Accumulated gain (loss)	$ (7)	$ (13)	$ (11)
Weighted Average Assumptions used as of December 31
Discount rate	2.10%	2.90%	2.60%
Postretirement Benefits
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year	$ 27	$ 27	$ 26
Service cost	2	2	2
Interest cost	1	1	1
Foreign currency exchange rates	0	0	0
Actuarial losses (gains)	(9)	(2)	1
Plan settlements	0	0	0
Benefits paid	(2)	(3)	(4)
Retiree contributions	1	2	1
Projected benefit obligation at end of year	20	27	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	1	2	3
Plan settlements	0	0	0
Benefits paid	(2)	(4)	(4)
Retiree contributions	1	2	1
Fair value of plan assets at end of year	0	0	0
Funded status at end of year	(20)	(27)	(27)
Amounts recognized in Consolidated Balance Sheet
Current liability	(2)	(2)	(2)
Non-current liability	(18)	(25)	(25)
Amounts recognized in Consolidated Balance Sheet	(20)	(27)	(27)
Pre-tax Amounts Recognized in Accumulated Other Comprehensive Income (Loss)
Accumulated gain (loss)	$ 19	$ 10	$ 8
Weighted Average Assumptions used as of December 31
Discount rate	3.00%	4.13%	3.44%
Healthcare cost trend
Initial	6.25%	6.50%	6.75%
Ultimate in 2025	5.00%	5.00%	5.00%

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Health care cost trend.

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Amount of (increase) decrease in accumulated benefit obligation of defined benefit plan from effects of settlement and curtailment.

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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