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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2020
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 2020, 2019 and 2018 were as follows:
(in millions)202020192018
Stock options$15 $21 $23 
RSUs90 81 64 
Share-based compensation expense$105 $102 $87 
Research and development expenses$11 $9 $9 
Selling, general and administrative expenses94 93 78 
Share-based compensation expense$105 $102 $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 2020, 2019 and 2018 were estimated as of the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:
202020192018
Expected stock option life (years)3.03.03.0
Expected volatility38.7 %46.5 %54.0 %
Risk-free interest rate1.2 %2.5 %2.7 %
Expected dividend yield— %— %— %
Summary of stock option activity
The following table summarizes stock option activity during 2020:
(in millions, except per share amounts)OptionsWeighted-
Average
Exercise
Price Per Share		Weighted-
Average
Remaining
Contractual
Term
(Years)		Aggregate
Intrinsic
Value
Outstanding, January 1, 20207.1 $26.99   
Granted2.3 $24.74   
Exercised(0.4)$14.65   
Expired or forfeited(0.3)$72.40   
Outstanding, December 31, 20208.7 $25.59 7.2$14 
Vested and expected to vest, December 31, 20208.2 $25.73 7.1$14 
Vested and exercisable, December 31, 20204.8 $27.74 6.0$11 
Summary of non-vested time-based RSU activity
The following table summarizes non-vested time-based RSU activity during 2020:
(in millions, except per share amounts)Time-Based
RSUs		Weighted-
Average
Grant-Date
Fair Value Per Share
Non-vested, January 1, 20206.1 $20.54 
Granted3.3 $21.92 
Vested(3.4)$19.37 
Forfeited(0.3)$21.78 
Non-vested, December 31, 20205.7 $21.98 
Schedule of assumptions used to calculate the fair values of performance-based RSUs
The fair values of TSR performance-based RSUs granted during 2020, 2019 and 2018 were estimated with the following assumptions:
202020192018
Contractual term (years)3.03.03.0
Expected Company share volatility38.6%46.5%54.2%
Risk-free interest rate1.2%2.5%2.7%
Summary of non-vested performance-based RSU activity
The following table summarizes non-vested performance-based RSU activity during 2020:
(in millions, except per share amounts)Performance-based
RSUs		Weighted-
Average
Grant-Date
Fair Value Per Share
Non-vested, January 1, 20202.0 $25.80 
Granted0.9 $26.61 
Vested(0.6)$19.02 
Non-vested, December 31, 20202.3 $28.10