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Stock-Based Compensation and Stockholders’ Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Company's Stock-Based Compensation Expense A summary of the Company’s stock-based compensation expense is presented below (in millions):
Year Ended December 31,
202120202019
Liability-classified awards$— $— $5 
Stock options and restricted awards11 8 3 
Total stock-based compensation expense$11 $8 $8 
Summary of Stock Option Activity A summary of stock option activity during the year ended December 31, 2021 is presented below:
Number of SharesWeighted Average Exercise PriceAggregate Grant Date Fair Value (in millions)
Outstanding at December 31, 20209,879,240 $1.93 $10 
Issued— — — 
Exercised(2,202,895)$1.62 (2)
Forfeited(24,938)$11.15 — 
Outstanding at December 31, 20217,651,407 $1.99 $8 
Exercisable at December 31, 20217,480,088 $1.79 $7 
Summary of Restricted Stock Activity A summary of Restricted Award activity during the year ended December 31, 2021 is presented below:
Number of SharesWeighted Average Grant Date Fair Value
Outstanding at December 31, 20202,020,650 $10.54 
Issued899,800 $14.70 
Vested(543,879)$10.23 
Forfeited(205,542)$10.62 
Repurchased(1)
(200,735)$11.00 
Outstanding at December 31, 20211,970,294 $12.47 
__________________(1) Represents withholdings to cover tax obligations on vested shares when applicable