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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of the components and classification of share-based compensation expense | The components and classification of share-based compensation expense related to stock options and RSUs for the years 2019, 2018 and 2017 were as follows:
(in millions) |  | 2019 |  | 2018 |  | 2017
Stock options |  | $ | 21 |  |  | $ | 23 |  |  | $ | 18 |
RSUs |  | 81 |  |  | 64 |  |  | 69 |
Share-based compensation expense |  | $ | 102 |  |  | $ | 87 |  |  | $ | 87 |
Research and development expenses |  | $ | 9 |  |  | $ | 9 |  |  | $ | 8 |
Selling, general and administrative expenses |  | 93 |  |  | 78 |  |  | 79 |
Share-based compensation expense |  | $ | 102 |  |  | $ | 87 |  |  | $ | 87 |
Schedule of weighted-average assumption as of the date of grant using the Black Scholes option-pricing model | The fair values of all stock options granted for the years 2019, 2018 and 2017 were estimated as of the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:
|  | 2019 |  | 2018 |  | 2017
Expected stock option life (years) |  | 3.0 |  |  | 3.0 |  |  | 3.0 |
Expected volatility |  | 46.5 | % |  | 54.0 | % |  | 67.3 | %
Risk-free interest rate |  | 2.5 | % |  | 2.7 | % |  | 1.8 | %
Expected dividend yield |  | — | % |  | — | % |  | — | %
Summary of stock option activity | The following table summarizes stock option activity during 2019:
(in millions, except per share amounts) |  | Options |  | Weighted- Average Exercise Price Per Share |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding, January 1, 2019 |  | 5.9 |  |  | $ | 27.88 |  |  |  |  |  |
Granted |  | 1.7 |  |  | $ | 23.19 |  |  |  |  |  |
Exercised |  | (0.3 | ) |  | $ | 16.03 |  |  |  |  |  |
Expired or forfeited |  | (0.2 | ) |  | $ | 37.27 |  |  |  |  |  |
Outstanding, December 31, 2019 |  | 7.1 |  |  | $ | 26.99 |  |  | 7.5 |  | $ | 61 |
Vested and expected to vest, December 31, 2019 |  | 6.7 |  |  | $ | 27.43 |  |  | 7.4 |  | $ | 57 |
Vested and exercisable, December 31, 2019 |  | 3.6 |  |  | $ | 34.27 |  |  | 6.5 |  | $ | 24 |
Summary of non-vested time-based RSU activity | The following table summarizes non-vested time-based RSU activity during 2019:
(in millions, except per share amounts) |  | Time-Based RSUs |  | Weighted- Average Grant-Date Fair Value Per Share
Non-vested, January 1, 2019 |  | 5.8 |  |  | $ | 18.29 |
Granted |  | 3.1 |  |  | $ | 24.13 |
Vested |  | (1.9 | ) |  | $ | 17.88 |
Forfeited |  | (0.9 | ) |  | $ | 23.77 |
Non-vested, December 31, 2019 |  | 6.1 |  |  | $ | 20.54 |
Schedule of assumptions used to calculate the fair values of performance-based RSUs | The fair values of TSR performance-based RSUs granted during 2019, 2018 and 2017 were estimated with the following assumptions:
|  | 2019 |  | 2018 |  | 2017
Contractual term (years) |  | 3.0 |  | 3.0 |  | 3.0
Expected Company share volatility |  | 46.5% |  | 54.2% |  | 67.2% - 77.2%
Risk-free interest rate |  | 2.5% |  | 2.7% |  | 1.7% - 1.8%
Summary of non-vested performance-based RSU activity | The following table summarizes non-vested performance-based RSU activity during 2019:
(in millions, except per share amounts) |  | Performance-based RSUs |  | Weighted- Average Grant-Date Fair Value Per Share
Non-vested, January 1, 2019 |  | 1.5 |  |  | $ | 34.06 |
Granted |  | 1.0 |  |  | $ | 29.52 |
Vested |  | (0.3 | ) |  | $ | 48.42 |
Forfeited |  | (0.2 | ) |  | $ | 91.76 |
Non-vested, December 31, 2019 |  | 2.0 |  |  | $ | 25.80 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of equity based payment instruments, excluding stock (or unit) options, including but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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