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STOCK-BASED COMPENSATION - Phantom Stock Awards and Stock Appreciation Rights ("SARs") (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Phantom Stock Awards |  |  |
Stock-based compensation |  |  |
Recognized expense (income) related to valuation | $ 6 | $ 2 | $ 5
Granted (in shares) | 104,580 | 140,710 | 134,560
Fair value of stock award granted | $ 4 | $ 4 | $ 4
Cash paid to settle awards | 5 | 5 | 6
Accrued compensation cost liability | 12 | 10 |
Unrecognized compensation cost | $ 4 | $ 4 |
Equivalent common shares (in shares) | 0 | 0 |
Phantom Stock Awards | Minimum |  |  |
Stock-based compensation |  |  |
Vesting period | 5 years |  |
Phantom Stock Awards | Maximum |  |  |
Stock-based compensation |  |  |
Vesting period | 10 years |  |
Stock Appreciation Rights |  |  |
Stock-based compensation |  |  |
Vesting period | 5 years |  |
Recognized expense (income) related to valuation | $ 3 | $ 2 | $ 6
Accrued compensation cost liability | 7 | 8 |
Unrecognized compensation cost | $ 0 | $ 0 |
Equivalent common shares (in shares) | 0 | 1,000,000 |

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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=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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