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Management Stock Plans (Tables)
12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Stock Bonus Plan

 
 
Restricted Stock Units
 
 
2019
 
 
Number of Units
 
Weighted-Average Grant Date Fair Value
Units outstanding, beginning of year
 
28,443,070

 
$
5.86

Activity during the year:
 
 
 
 
Granted
 
25,591,407

 
4.67

Vested
 
(15,013,517
)
 
5.63

Forfeited
 
(1,367,274
)
 
5.41

Units outstanding, end of year
 
37,653,686

 
5.16

Rollforward of Restricted Stock Units Under Stock Bonus Plan


Summary of Compensation Costs, Corresponding Tax Benefit, and Unrecognized Compensation Costs
he following table is a summary of the Company's compensation costs, the corresponding tax benefit, and unrecognized compensation costs:
 
 
Years Ended December 31,
(Dollars in millions)
 
2019
 
2018
 
2017
Compensation costs
 
$
89

 
$
77

 
$
66

Tax benefit
 
23

 
20

 
26

Unrecognized compensation costs
 
129

 
110

 
111