BENEFIT PLANS - RECONCILIATION FOR THE PLAN ASSETS CATEGORIZED AS LEVEL 3 (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Change in Plan Assets. Level 3 [Roll Forward]
Fair value of plan assets at beginning of year	$ 185	$ 173
Actual return on plan assets:
Effect of exchange rate changes	17	2
Fair value of plan assets at end of year	213	185
Insurance contracts
Change in Plan Assets. Level 3 [Roll Forward]
Fair value of plan assets at beginning of year	30
Actual return on plan assets:
Fair value of plan assets at end of year	37	30
Hedge funds
Change in Plan Assets. Level 3 [Roll Forward]
Fair value of plan assets at beginning of year	9
Actual return on plan assets:
Fair value of plan assets at end of year	12	9
Fair Value, Inputs, Level 1, 2 and 3
Change in Plan Assets. Level 3 [Roll Forward]
Fair value of plan assets at beginning of year	185
Actual return on plan assets:
Fair value of plan assets at end of year		185
Level 3
Change in Plan Assets. Level 3 [Roll Forward]
Fair value of plan assets at beginning of year	39	35
Actual return on plan assets:
Relating to assets still held at the reporting date	3	3
Purchases, sales and settlements, net	2	2
Effect of exchange rate changes	5	(1)
Fair value of plan assets at end of year	49	39
Level 3 \| Insurance contracts
Change in Plan Assets. Level 3 [Roll Forward]
Fair value of plan assets at beginning of year	30	28
Actual return on plan assets:
Relating to assets still held at the reporting date	3	4
Purchases, sales and settlements, net	0	(1)
Effect of exchange rate changes	4	(1)
Fair value of plan assets at end of year	37	30
Level 3 \| Hedge funds
Change in Plan Assets. Level 3 [Roll Forward]
Fair value of plan assets at beginning of year	9	7
Actual return on plan assets:
Relating to assets still held at the reporting date	0	(1)
Purchases, sales and settlements, net	2	3
Effect of exchange rate changes	1	0
Fair value of plan assets at end of year	$ 12	$ 9

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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- Definition

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

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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-Publisher FASB
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- Definition

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

+ References

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- Definition

Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

+ References

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- Definition

Defined Benefit Plans, Actual Return On Plan Assets [Abstract]

+ References

No definition available.

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