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Stock-Based Compensation Plans - Schedule of Restricted Stock Units and Performance-based Restricted Stock Units Activity (Details)
shares in Millions
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Restricted Stock Activity  
Non-vested at beginning of period | shares 6.9
Granted | shares 3.7
Vested | shares (2.1)
Forfeited | shares (1.0)
Non-vested at end of period | shares 7.5
Restricted Stock Weighted-Average Grant-Date Fair Value  
Non-vested at beginning of period | $ / shares $ 20.88
Granted | $ / shares 22.63
Vested | $ / shares 20.03
Forfeited | $ / shares 21.52
Non-vested at end of period | $ / shares $ 21.91