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Management Stock Plans (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Bonus Plan

 
 
Restricted Stock Units
 
 
2018
 
 
Number of Units
 
Weighted-Average Grant Date Fair Value
Units outstanding, beginning of year
 
27,838,414

 
$
5.86

Activity during the year:
 
 
 
 
Granted
 
14,667,730

 
5.89

Vested
 
(13,198,540
)
 
5.88

Forfeited
 
(864,534
)
 
5.97

Units outstanding, end of year
 
28,443,070

 
5.86

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)
 
2018
 
2017
 
2016
Compensation costs
 
$
77

 
$
66

 
$
67

Tax benefit
 
20

 
26

 
26

Unrecognized compensation costs
 
110

 
111

 
96