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Stock Based Compensation - (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of RSU and RSA Activity Under Equity-Based Plans
The following tables summarize RSU and RSA activity under our equity-based plans for the first half of 2020:
 
Time-based RSUs and RSAs
 
Total Number
of RSUs
Total Number
of RSAs
Total Number
of Shares
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 2019
1,104,729

61,136

1,165,865

$
48.47

Granted
789,308

—

789,308

51.14

Vested
(356,897
)
(15,028
)
(371,925
)
42.87

Forfeited
(63,725
)
(3,611
)
(67,336
)
51.74

Nonvested at June 30, 2020
1,473,415

42,497

1,515,912

$
51.09

 
Performance-based RSUs and RSAs
 
Total Number
of RSUs
Total Number
of RSAs
Total Number of Shares
Weighted-Average
Grant Date
Fair Value
Nonvested at December 31, 2019
15,752

114,857

130,609

$
49.70

Granted
183,981

—

183,981

52.86

Forfeited
—

(11,036
)
(11,036
)
47.61

Nonvested at June 30, 2020

199,733

103,821

303,554

$
51.69
Stock-based Compensation Expense Stock based compensation expense and other disclosures for stock based awards made to our employees pursuant to the equity plans was as follows: 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
2020
2019
 
2020
2019
Cost of providing services
$
3

$
2

 
$
5

$
4

Sales and marketing
1

1

 
3

1

General and administrative
6

7

 
11

13

Systems development and programming costs
1

1

 
1

2

Total stock based compensation expense
$
11

$
11

 
$
20

$
20