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Stock-based compensation - non-option award rollforward (Details)
shares in Millions
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Weighted average grant date fair value per award  
Forfeited $ 27,500,000
RSUs  
Number of awards  
Beginning balance | shares 4.9
Granted | shares 1.2
Vested | shares (1.1)
Forfeited | shares (0.6)
Ending balance | shares 4.4
Weighted average grant date fair value per award  
Beginning balance $ 15.31
Granted 29.77
Vested 15.02
Forfeited 18.30
Ending balance $ 19.52
Stock options  
Weighted average grant date fair value per award  
Contractual life 10 years
Stock options | Minimum  
Weighted average grant date fair value per award  
Award vesting period 3 years
Stock options | Maximum  
Weighted average grant date fair value per award  
Award vesting period 4 years