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Equity , Restricted Stock Units Activity (Details) - RSUs - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Shares      
Balance, beginning (shares) 4.7 6.1 7.8
Granted (shares) 1.2 1.9 2.7
Forfeited (shares) (0.4) (0.4) (0.7)
Vested (shares) (2.3) (2.9) (3.7)
Balance, ending (shares) 3.2 4.7 6.1
Weighted-Average Grant Date Fair Value per Share      
Balance, beginning (in dollars per share) $ 90.46 $ 64.56 $ 46.07
Granted (in dollars per share) 202.63 121.16 87.09
Forfeited (in dollars per share) 114.96 79.83 55.13
Vested (in dollars per share) 81.52 58.20 43.31
Balance, ending (in dollars per share) $ 136.08 $ 90.46 $ 64.56
Compensation cost not yet recognized $ 367.8    
Compensation cost not yet recognized period of recognition 2 years 7 months 6 days