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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Millions
Total
Common Stock and Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income
Beginning balance at Dec. 31, 2019 $ 475 $ 694 $ (219) $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock for employee stock purchase plan   5    
Stock-based compensation expense   20    
Net income 217   217  
Repurchase of common stock     (100)  
Awards effectively repurchased for required employee withholding taxes     (6)  
Other comprehensive (loss) income 5     5
Ending balance at Jun. 30, 2020 616 719 (108) 5
Beginning balance at Mar. 31, 2020 533 703 (172) 2
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock for employee stock purchase plan   5    
Stock-based compensation expense   11    
Net income 126   126  
Repurchase of common stock     (60)  
Awards effectively repurchased for required employee withholding taxes     (2)  
Other comprehensive (loss) income 3     3
Ending balance at Jun. 30, 2020 616 719 (108) 5
Beginning balance at Dec. 31, 2020 607 747 (144) 4
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock for employee stock purchase plan   5    
Stock-based compensation expense   24    
Net income 192   192  
Repurchase of common stock (74)   (74)  
Awards effectively repurchased for required employee withholding taxes     (9)  
Other comprehensive (loss) income (1)     (1)
Ending balance at Jun. 30, 2021 744 776 (35) 3
Beginning balance at Mar. 31, 2021 653 758 (108) 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of common stock for employee stock purchase plan   5    
Stock-based compensation expense   13    
Net income 91   91  
Repurchase of common stock     (14)  
Awards effectively repurchased for required employee withholding taxes     (4)  
Other comprehensive (loss) income 0     0
Ending balance at Jun. 30, 2021 $ 744 $ 776 $ (35) $ 3