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STOCK-BASED COMPENSATION - Phantom Stock Awards and Stock Appreciation Rights ("SARs") (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Phantom Share Units (PSUs) |  |  |
Stock-based compensation |  |  |
Recognized expense (income) related to valuation | $ 2 | $ 6 | $ 2
Granted (in shares) | 98,140 | 104,580 | 140,710
Fair value of stock award granted | $ 4 |  |
Cash paid to settle awards | 6 |  | $ 5
Accrued compensation cost liability | 4 | $ 12 |
Unrecognized compensation cost | $ 2 | $ 4 |
Equivalent common shares (in shares) | 0 | 0 |
Stock Appreciation Rights (SARs) |  |  |
Stock-based compensation |  |  |
Recognized expense (income) related to valuation | $ 1 | $ 3 | 2
Cash paid to settle awards | 5 | 4 | $ 4
Accrued compensation cost liability | 2 | 7 |
Unrecognized compensation cost | $ 0 | $ 0 |
Equivalent common shares (in shares) | 0 | 0 |

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Equivalent Common Shares + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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