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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation Activity

Shares
(in millions)
 
Weighted-Average Grant Date Fair Value
 
Weighted-Average Remaining Contractual Term in Years
Units outstanding at January 1, 2018
52.9

 
$
21.75

 
2.0
Granted
13.7

 
$
30.41

 
 
Settled
(10.2
)
 
$
30.23

 
 
Forfeited or expired
(8.3
)
 
$
29.51

 
 
Units outstanding at December 31, 2018(a)
48.1

 
$
19.81

 
1.3

__________
(a)
Includes the target amount of PSUs.