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INCOME TAXES - Uncertain Tax Positions and Interest and Penalties - Additional Disclosures (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Unrecognized tax benefits that would impact effective tax rate if recognized	$ 58	$ 50
Liability for uncertain tax positions	84	73	$ 67
Reasonably possible reduction in the liability for uncertain tax positions	9
Other Noncurrent Liabilities
Income Taxes
Liability for uncertain tax positions	81	68
Other Noncurrent Assets
Income Taxes
Liability for uncertain tax positions	$ 3	$ 5

X

- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns, and the amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ 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=84230637&loc=d3e32718-109319

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (b)
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