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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Balance at beginning of period (in number of options/units) | 49,303,879 |  |
Granted (in number of options/units) | 7,167,000 |  |
Exercised (in number of options/units) | (14,750) |  |
Expired/Forfeited (in number of options/units) | (2,661,894) |  |
Balance at end of period (in number of options/units) | 53,794,235 | 49,303,879 |
Weighted-average exercise price at beginning of period (in dollars per option) | $ 34.10 |  |
Granted, Exercise Price (in dollars per option) | 4.35 |  |
Exercised, Exercise Price (in dollars per option) | 12.12 |  |
Expired/Forfeited, Exercise Price (in dollars per option) | 31.80 |  |
Weighted-average exercise price at end of period (in dollars per option) | $ 30.25 | $ 34.10 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | 4 years 7 months |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ 66 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 44,314,195 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ 34.20 |  |
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 | $ 14 |  |
Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period | 10 years |  |
Annual vesting percentage | 25.00% |  |
Total unrecognized compensation cost related to unvested options expected to be recognized over a weighted-average period | $ 19 |  |
Weighted-average period used in calculating unrecognized compensation cost, stock options (in years) | 1 year 11 months |  |
Fair value assumptions and methodology [Abstract] |  |  |
Weighted-average expected volatility | 71.60% | 37.90% | 36.60%
Expected life of options (in years) | 5 years 4 months 3 days | 5 years 2 months 1 day | 4 years 11 months 1 day
Expected dividend rate | 0.00% | 4.50% | 3.50%
Risk free interest rate | 1.30% | 1.70% | 1.70%
Weighted-average grant-date fair value (in dollars per option) | $ 2.64 | $ 4.30 | $ 7.43
Total intrinsic value of options exercised | $ 0 | $ 1 | $ 17
Fair value of options vested | $ 43 | $ 50 | $ 76
Stock Appreciation Rights (SARs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period | 5 years |  |
Annual vesting percentage |  |  | 33.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Balance at end of period (in number of options/units) | 1,034,153 |  |

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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://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=6415400&loc=d3e5070-113901 + Details
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- Definition Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + 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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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