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STOCK BASED COMPENSATION - Additional Disclosures for Equity Based Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Additional Disclosures for equity-based plans
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees (in shares)	279,356	451,639	458,232
Time-based RSUs and RSAs
Additional Disclosures for equity-based plans
Total grant date fair value of shares granted (in millions)	$ 50	$ 38	$ 38
Total grant date fair value of shares vested (in millions)	$ 31	$ 30	$ 28
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees (in shares)	230,569	315,762	348,010
Performance-based RSUs and RSAs
Additional Disclosures for equity-based plans
Total grant date fair value of shares granted (in millions)	$ 10	$ 4	$ 14
Total grant date fair value of shares vested (in millions)	$ 5	$ 11	$ 7
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees (in shares)	48,787	135,877	110,222

X

- Definition

Share based compensation arrangement by share based payment award equity instruments other than options granted in period fair value.

+ References

No definition available.

+ Details

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

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