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STOCK-BASED COMPENSATION - Pre-tax Compensation Expense and the Related Income Tax Benefit (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock-based compensation |  |  |
Pre-tax compensation expense | $ 29 | $ 39 | $ 43
Income tax benefit | $ 11 | $ 14 | $ 16
Tax rate (as a percent) | 37.00% | 37.00% | 37.00%
Long-term stock awards |  |  |
Stock-based compensation |  |  |
Pre-tax compensation expense | $ 23 | $ 23 | $ 33
Stock Options |  |  |
Stock-based compensation |  |  |
Pre-tax compensation expense | 2 | 5 | 4
Phantom stock awards and stock appreciation rights |  |  |
Stock-based compensation |  |  |
Pre-tax compensation expense | $ 4 | $ 11 | $ 6

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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