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STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION (Stock Option and SARs) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Balance at beginning of period (in number of options/units) | 48,014,688 |  |
Granted (in number of options/units) | 3,315,000 |  |
Exercised (in number of options/units) | (801,706) |  |
Expired/Forfeited (in number of options/units) | (3,721,618) |  |
Balance at end of period (in number of options/units) | 46,806,364 | 48,014,688 |
Weighted-average exercise price at beginning of period (in dollars per option) | $ 28.63 |  |
Granted, Exercise Price (in dollars per option) | 18.74 |  |
Exercised, Exercise Price (in dollars per option) | 10.05 |  |
Expired/Forfeited, Exercise Price (in dollars per option) | 39.26 |  |
Weighted-average exercise price at end of period (in dollars per option) | $ 27.40 | $ 28.63 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | 4 years 6 months |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ 38 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 39,919,885 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ 29.80 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term | 3 years 9 months |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $ 26 |  |
Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period | 10 years |  |
Annual vesting percentage | 33.00% | 25.00% |
Total unrecognized compensation cost related to unvested options expected to be recognized over a weighted-average period | $ 23 |  |
Weighted-average period used in calculating unrecognized compensation cost, stock options (in years) | 1 year 5 months |  |
Fair value assumptions and methodology [Abstract] |  |  |
Weighted-average expected volatility | 46.10% | 51.40% | 71.60%
Expected life of options (in years) | 5 years 11 months | 5 years 8 months 11 days | 5 years 4 months 3 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate | 1.20% | 0.00% | 0.00%
Risk free interest rate | 2.60% | 2.00% | 1.30%
Weighted-average grant-date fair value (in dollars per option) | $ 7.84 | $ 7.61 | $ 2.64
Total intrinsic value of options exercised | $ 7 | $ 5 | $ 0
Fair value of options vested | $ 24 | $ 25 | $ 43
Stock Appreciation Rights (SARs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Annual vesting percentage |  | 33.00% |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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