SUPPLEMENTAL FINANCIAL INFORMATION - Additional Information (Details) - USD ($)	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Property, Plant and Equipment [Line Items]
Right-of-use asset obtained in exchange for operating lease liability	$ 21,000,000	$ 35,000,000
Right-of-use asset obtained in exchange for finance lease liability		7,000,000
Lease not yet commenced, assumption and judgment, value of underlying asset, amount	46,000,000
Unsettled share repurchase	35,000,000	0
Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
Capital expenditures incurred but not yet paid	$ 70,000,000	$ 42,000,000

Other Liabilities, Current, Unsettled Share Repurchase

No definition available.

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- Definition

Future cash outflow to pay for purchases of fixed assets that have occurred.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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- Definition

Amount lessor expects from underlying asset following end of operating lease term for lease that has not yet commenced.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981

+ Details

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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.

+ References

No definition available.

+ Details

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- Definition

Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

+ References

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-Publisher FASB
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- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

+ References

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