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Stock Based Compensation (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 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
759,856

—

759,856

51.32

Vested
(180,422
)
—

(180,422
)
40.25

Forfeited
(28,943
)
—

(28,943
)
50.10

Nonvested at March 31, 2020
1,655,220

61,136

1,716,356

$
50.57

 
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

Nonvested at March 31, 2020
199,733

114,857

314,590

$
51.55
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 March 31,
(in millions)
2020
2019
Cost of providing services
$
2

$
2

Sales and marketing
2

1

General and administrative
5

5

Systems development and programming costs
—

1

Total stock based compensation expense
$
9

$
9