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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Common Stock and Additional Paid-In Capital:
Retained Earnings (Accumulated Deficit):
Retained Earnings (Accumulated Deficit):
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive (Loss) Income:
Beginning balance at Dec. 31, 2018 $ 375 $ 641 $ (266)   $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock from exercise of stock options   2      
Issuance of common stock for employee stock purchase plan   9      
Stock based compensation expense   42      
Net income 212   212    
Repurchase of common stock     (140)    
Awards effectively repurchased for required employee withholding taxes     (25)    
Other comprehensive (loss) income 0        
Ending balance at Dec. 31, 2019 475 694 (219) $ (1) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock for employee stock purchase plan   9      
Stock based compensation expense   44      
Net income 272   272    
Repurchase of common stock     (178)    
Awards effectively repurchased for required employee withholding taxes     (18)    
Other comprehensive (loss) income 4       4
Ending balance at Dec. 31, 2020 607 747 (144)   4
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock from exercise of stock options   1      
Issuance of common stock for employee stock purchase plan   10      
Stock based compensation expense   50      
Net income 338   338    
Repurchase of common stock     (94)    
Awards effectively repurchased for required employee withholding taxes     (26)    
Other comprehensive (loss) income (5)       (5)
Ending balance at Dec. 31, 2021 $ 881 $ 808 $ 74   $ (1)