v3.22.2.2
COMMON STOCK AND STOCKHOLDERS' (DEFICIT) EQUITY - NARRATIVE (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2022
USD ($)
Feb. 28, 2021
$ / shares
shares
Sep. 30, 2022
USD ($)
vote
class
$ / shares
shares
Jun. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
vote
class
$ / shares
shares
Sep. 30, 2021
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Preferred stock, shares outstanding (in shares) | shares     0     0  
Number of classes of common stock | class     3     3  
Share-based compensation     $ 110   $ 1,244 $ 494 $ 1,254
Capitalized share-based compensation expense     4   20 21 20
Unrecognized compensation cost     1,400     $ 1,400  
Unrecognized compensation cost related to outstanding stock options, weighted-average period           2 years 1 month 6 days  
Technology and development              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation     25   503 $ 166 505
General and administrative              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation     83   678 316 686
Workforce Reduction | April 2022 Restructuring              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation       $ 24      
Workforce Reduction | August 2022 Restructuring              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation     53        
Employee Severance | April 2022 Restructuring | Technology and development              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation $ 16            
Employee Severance | April 2022 Restructuring | General and administrative              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation 6            
Employee Severance | August 2022 Restructuring | Technology and development              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation 22            
Employee Severance | August 2022 Restructuring | General and administrative              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation $ 28            
Time-Based RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation     27   881 235 889
Market-Based RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation     79   360 245 360
Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation     $ 2   1 $ 5 3
2013, 2020 and 2021 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock authorized (in shares) | shares     360,000,000     360,000,000  
Shares issued under plans (in shares) | shares           90,000,000  
Common stock reserved for issuance (in shares) | shares           146,000,000  
2021 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares remaining available for issuance (in shares) | shares     123,000,000     123,000,000  
2021 ESPP              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation     $ 2   $ 2 $ 9 $ 2
Tranche 1 Convertible Note Holders              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum amount of all warrants     $ 380     $ 380  
Common Class A              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of voting rights per share | vote     1     1  
Common Class A | IPO              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Conversion of common stock (in shares) | shares   137,300,000          
Conversion price (in dollars per share) | $ / shares   $ 26.60          
Aggregate warrants exercisable (in shares) | shares     14,300,000     14,300,000  
Exercise price (in dollars per share) | $ / shares     $ 26.60     $ 26.60  
Common Class B              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of voting rights per share | vote     10     10