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STOCK-BASED COMPENSATION - Phantom Stock Awards and Stock Appreciation Rights ("SARs") (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Phantom Share Units (PSUs) |  |  |
Stock-based compensation |  |  |
Recognized expense (income) related to valuation | $ 4 | $ 4 | $ 1
Granted (in shares) | 82,630 | 79,500 | 98,140
Fair value of stock award granted | $ 3 | $ 3 | $ 4
Cash paid to settle awards | 3 | 3 | 6
Accrued compensation cost liability | 6 | 5 |
Unrecognized compensation cost | $ 4 | $ 3 |
Equivalent common shares (in shares) | 0 | 0 |
Stock Appreciation Rights (SARs) |  |  |
Stock-based compensation |  |  |
Recognized expense (income) related to valuation | $ 1 |  |
Granted (in shares) | 0 | 0 |
Cash paid to settle awards |  | $ 2 | $ 5
Equity instruments other than options, outstanding (in shares) | 0 | 0 |

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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + 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 (k) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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