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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2021
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 2021, 2020 and 2019 were as follows:
(in millions)202120202019
Stock options$15 $15 $21 
RSUs113 90 81 
Share-based compensation expense$128 $105 $102 
Research and development expenses$10 $11 $9 
Selling, general and administrative expenses118 94 93 
Share-based compensation expense$128 $105 $102 
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 2021, 2020 and 2019 were estimated as of the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions:
202120202019
Expected stock option life (years)3.03.03.0
Expected volatility50.2 %38.7 %46.5 %
Risk-free interest rate0.4 %1.2 %2.5 %
Expected dividend yield— %— %— %
Summary of stock option activity
The following table summarizes stock option activity during 2021:
(in millions, except per share amounts)OptionsWeighted-
Average
Exercise
Price Per Share		Weighted-
Average
Remaining
Contractual
Term
(Years)		Aggregate
Intrinsic
Value
Outstanding, January 1, 20218.7 $25.59   
Granted1.6 $32.01   
Exercised(1.2)$18.20   
Expired or forfeited(0.2)$29.33   
Outstanding, December 31, 20218.9 $27.65 6.6$36 
Vested and expected to vest, December 31, 20218.5 $27.65 6.5$35 
Vested and exercisable, December 31, 20215.5 $27.60 5.5$30 
Summary of non-vested time-based RSU activity
The following table summarizes non-vested time-based RSU activity during 2021:
(in millions, except per share amounts)Time-Based
RSUs		Weighted-
Average
Grant-Date
Fair Value Per Share
Non-vested, January 1, 20215.7 $21.98 
Granted3.4 $31.51 
Vested(3.3)$21.00 
Forfeited(0.4)$26.77 
Non-vested, December 31, 20215.4 $28.16 
Schedule of assumptions used to calculate the fair values of performance-based RSUs
The fair values of TSR performance-based RSUs granted during 2021, 2020 and 2019 were estimated with the following assumptions:
202120202019
Contractual term (years)3.03.03.0
Expected Company share volatility52%38.6%46.5%
Risk-free interest rate0.4%1.2%2.5%
Summary of non-vested performance-based RSU activity
The following table summarizes non-vested performance-based RSU activity during 2021:
(in millions, except per share amounts)Performance-based
RSUs		Weighted-
Average
Grant-Date
Fair Value Per Share
Non-vested, January 1, 20212.3 $28.10 
Granted1.0 $40.42 
Vested(1.0)$27.23 
Non-vested, December 31, 20212.3 $33.92