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RESTRUCTURING AND OTHER COSTS - RESTRUCTURING ACCRUALS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restructuring Reserve
Beginning balance	$ 30	$ 46
Provisions and adjustments	36	42
Amounts applied	(23)	(49)
Change in estimates	(9)	(9)
Ending balance	34	30
Severance
Restructuring Reserve
Beginning balance	27	43
Provisions and adjustments	32	36
Amounts applied	(21)	(43)
Change in estimates	(9)	(9)
Ending balance	29	27
Severance | 2018 and Prior Plans
Restructuring Reserve
Beginning balance	7
Provisions and adjustments	2
Amounts applied	(4)
Change in estimates	0
Ending balance	5	7
Severance | 2019 Plans
Restructuring Reserve
Beginning balance	20	0
Provisions and adjustments	2	31
Amounts applied	(8)	(9)
Change in estimates	(7)	(2)
Ending balance	7	20
Severance | 2020 Plans
Restructuring Reserve
Beginning balance	0
Provisions and adjustments	28
Amounts applied	(9)
Change in estimates	(2)
Ending balance	17	0
Severance | 2017 and Prior Plans
Restructuring Reserve
Beginning balance	2	27
Provisions and adjustments		4
Amounts applied		(22)
Change in estimates		(7)
Ending balance		2
Severance | 2018 Plans
Restructuring Reserve
Beginning balance	5	16
Provisions and adjustments		1
Amounts applied		(12)
Change in estimates		0
Ending balance		5
Other Restructuring Costs
Restructuring Reserve
Beginning balance	3	3
Provisions and adjustments	4	6
Amounts applied	(2)	(6)
Ending balance	5	3
Other Restructuring Costs | 2018 and Prior Plans
Restructuring Reserve
Beginning balance	3
Provisions and adjustments	0
Amounts applied	0
Ending balance	3	3
Other Restructuring Costs | 2019 Plans
Restructuring Reserve
Beginning balance	0	0
Provisions and adjustments	1	3
Amounts applied	(1)	(3)
Ending balance	0	0
Other Restructuring Costs | 2020 Plans
Restructuring Reserve
Beginning balance	0
Provisions and adjustments	3
Amounts applied	(1)
Ending balance	2	0
Other Restructuring Costs | 2017 and Prior Plans
Restructuring Reserve
Beginning balance	3	3
Provisions and adjustments		2
Amounts applied		(2)
Ending balance		3
Other Restructuring Costs | 2018 Plans
Restructuring Reserve
Beginning balance	$ 0	0
Provisions and adjustments		1
Amounts applied		(1)
Ending balance		$ 0

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585

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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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-Topic 420
-SubTopic 10
-Section S99
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- Definition

Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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