INCOME TAXES Narrative (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Income tax payments, net of refunds	$ 389	$ 203
Decrease in Unrecognized Tax Benefits is Reasonably Possible	11
Secretariat of the Federal Revenue Bureau of Brazil [Member]
Income tax examination, estimate of possible loss	107
Income tax examination, penalties and interest expense	351
Shared Tax Assessment Payment	$ 300
Responsible party percentage	60.00%
Responsible party percentage-Sylvamo	40.00%
Income Tax Examination [Line Items]
Income tax examination, estimate of possible loss	$ 107

Responsible party percentage-Sylvamo

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Responsible party percentage

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- Definition

Shared Tax Assessment Payment

+ References

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- Definition

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)(3)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319

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Estimated amount of loss resulting from an adverse tax position.

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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

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4297-108586

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