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Stock-based compensation - Nonvested Restricted Stock and Restricted Stock Units Activity (Details) - Non-Vested Performance-Based Stock Units, Restricted Stock and Restricted Stock Units
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Number of Shares  
Nonvested PSUs, restricted stock and RSUs, beginning balance (shares) | shares 14,211,712
Granted (shares) | shares 6,179,808
Vested (shares) | shares (6,201,276)
Forfeited (shares) | shares (1,456,946)
Nonvested PSUs, restricted stock and RSUs, ending balance (shares) | shares 12,733,298
Weighted-average fair value  
Nonvested PSUs, restricted stock and RSUs, beginning balance (usd per share) | $ / shares $ 49.43
Granted (usd per share) | $ / shares 51.59
Vested (usd per share) | $ / shares 43.21
Forfeited (usd per share) | $ / shares 49.74
Nonvested PSUs, restricted stock and RSUs, ending balance (usd per share) | $ / shares $ 50.77