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Incentive Compensation Plans Stock-based Compensation Awards (Details)
shares in Millions
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Restricted stock (shares or units)  
Incentive Compensation Plans  
Granted awards 1.9
Weighted average grant date fair value | $ / shares $ 22.88
Performance-based stock (shares)  
Incentive Compensation Plans  
Granted awards 2.0
Weighted average grant date fair value | $ / shares $ 20.17
Total stock-based compensation awards  
Incentive Compensation Plans  
Granted awards 3.9