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Stock-Based Compensation (Table)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Summary of stock options
A summary of U.S. Cellular stock options outstanding (total and portion exercisable) and changes during 2019 is presented in the table below:
Common Share Options
Number of
Options
 
Weighted
Average
Exercise Price
 
Aggregate
Intrinsic Value
(in millions)
 
Weighted Average Remaining Contractual Life (in years)
Outstanding at December 31, 2018
806,000

 
$
43.10

 
 
 
 
(420,000 exercisable)
 
 
$
42.39

 
 
 
 
Exercised
(339,000
)
 
$
44.27

 
 
 
 
Expired
(7,000
)
 
$
45.87

 
 
 
 
Outstanding at December 31, 2019
460,000

 
$
42.20

 
$
—

 
4.9
(460,000 exercisable)
 
 
$
42.20

 
$
—

 
4.9
Summary of nonvested restricted stock units
A summary of U.S. Cellular nonvested restricted stock units at December 31, 2019, and changes during the year then ended is presented in the table below:
Common Restricted Stock Units
Number
 
Weighted Average Grant Date Fair Value
Nonvested at December 31, 2018
1,569,000

 
$
39.74

Granted
478,000

 
$
46.81

Vested
(525,000
)
 
$
42.99

Forfeited
(61,000
)
 
$
39.38

Nonvested at December 31, 2019
1,461,000

 
$
40.90

 
Summary of nonvested performance share units
A summary of U.S. Cellular’s nonvested performance share units and changes during 2019 is presented in the table below:
Common Performance Share Units
Number
 
Weighted Average Grant Date Fair Value
Nonvested at December 31, 2018
768,000

 
$
37.78

Granted
323,000

 
$
46.43

Vested
(5,000
)
 
$
37.92

Change in units based on approved performance factors
188,000

 
$
38.81

Forfeited
(29,000
)
 
$
38.55

Nonvested at December 31, 2019
1,245,000

 
$
40.16
Stock-based compensation
The following table summarizes stock‑based compensation expense recognized during 2019, 2018 and 2017:
Year Ended December 31,
2019
 
2018
 
2017
(Dollars in millions)
 
 
 
 
 
Stock option awards
$
—

 
$
2

 
$
6

Restricted stock unit awards
22

 
21

 
19

Performance share unit awards
18

 
13

 
4

Awards under Non-Employee Director compensation plan
1

 
1

 
1

Total stock-based compensation expense, before income taxes
41

 
37

 
30

Income tax benefit
(10
)
 
(9
)
 
(11
)
Total stock-based compensation expense, net of income taxes
$
31

 
$
28

 
$
19

 
Stock-based compensation, allocation by financial statement line item
The following table provides a summary of the classification of stock-based compensation expense included in the Consolidated Statement of Operations for the years ended:
December 31,
2019
 
2018
 
2017
(Dollars in millions)
 
 
 
 
 
Selling, general and administrative expense
$
36

 
$
33

 
$
27

System operations expense
5

 
4

 
3

Total stock-based compensation expense
$
41

 
$
37

 
$
30