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SHARE-BASED COMPENSATION - Stock Options (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock options |  |  |
Method and assumptions on valuation of stock options |  |  |
Expected stock option life (years) | 3 years | 3 years | 3 years
Expected volatility | 46.50% | 54.00% | 67.30%
Risk-free interest rate | 2.50% | 2.70% | 1.80%
Expected dividend yield | 0.00% | 0.00% | 0.00%
Options |  |  |
Beginning of the period (in shares) | 5.9 |  |
Granted (in shares) | 1.7 |  |
Exercised (in shares) | (0.3) |  |
Expired or forfeited (in shares) | (0.2) |  |
End of the period (in shares) | 7.1 | 5.9 |
Vested and expected to vest at the end of the period (in shares) | 6.7 |  |
Vested and exercisable at the end of the period (in shares) | 3.6 |  |
Weighted- Average Exercise Price Per Share |  |  |
Beginning of the period (in dollars per share) | $ 27.88 |  |
Granted (in dollars per share) | 23.19 |  |
Exercised (in dollars per share) | 16.03 |  |
Expired or forfeited (in dollars per share) | 37.27 |  |
End of the period (in dollars per share) | 26.99 | $ 27.88 |
Vested and expected to vest at the end of the period (in dollars per share) | 27.43 |  |
Vested and exercisable at the end of the period (in dollars per share) | $ 34.27 |  |
Weighted- Average Remaining Contractual Term (Years) |  |  |
Outstanding at the end of the period | 7 years 6 months |  |
Vested and expected to vest at the end of the period | 7 years 4 months 24 days |  |
Vested and exercisable at the end of the period | 6 years 6 months |  |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period | $ 61 |  |
Vested and expected to vest at the end of the period | 57 |  |
Vested and exercisable at the end of the period | $ 24 |  |
Additional disclosures |  |  |
Weighted-average grant date fair value of stock options (in dollars per share) | $ 8.45 | $ 7.83 | $ 5.97
Intrinsic value of stock options exercised in the period | $ 3 | $ 1 | $ 1
Proceeds from exercise of stock options | 5 | 2 | 1
Remaining unrecognized compensation expense related to non-vested awards | $ 11 |  |
Weighted-average remaining requisite service period over which unrecognized compensation cost is expected to be amortized | 1 year 6 months |  |
Fair value of stock options vested | $ 18 | $ 17 | $ 20
Vesting Period One |  |  |
Share-based compensation |  |  |
Vesting period | 3 years |  |
Vesting Period One | Stock options |  |  |
Share-based compensation |  |  |
Percentage of stock options that will vest on each of the first, second, third and fourth anniversaries from the date of grant | 33.00% |  |
Vesting Period Two |  |  |
Share-based compensation |  |  |
Vesting period | 4 years |  |
Vesting Period Two | Stock options |  |  |
Share-based compensation |  |  |
Percentage of stock options that will vest on each of the first, second, third and fourth anniversaries from the date of grant | 25.00% |  |

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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=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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