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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Summary of Stock Option Activity Under Equity-Based Plans

The following table summarizes stock option activity under our equity-based plan for the year ended December 31, 2018:

	Number of Shares		Weighted Average Exercise Price			Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Balance at December 31, 2017	1,296,863		$	12.27		5.87	$	41
Exercised	(617,157	)	11.00
Forfeited	(15,694	)	32.81
Canceled	(8,497	)	32.02
Balance at December 31, 2018	655,515		$	12.90		4.91	$	19
Exercisable at December 31, 2018	642,631		$	12.65		4.94	$	19
Vested and expected to vest at December 31, 2018	655,515		$	12.90		4.91	$	19

Additional Disclosure for Stock Options

	Year Ended December 31,
Additional Disclosures for Stock Options (in millions)	2018			2017			2016
Total fair value of options vested	$	4		$	7		$	7
Total intrinsic value of options exercised	24			36			21
Cash received from options exercised	7			11			5

Summary of RSU and RSA Activity Under Equity-Based Plans

The following table summarizes RSU and RSA activity under our equity-based plans for the year ended December 31, 2018:

	RSUs					RSAs
	Number of Units		Weighted-Average Grant Date Fair Value			Number of Shares		Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2017	2,703,335		$	25.82		—		$	—
Granted	714,358		47.07			372,783		49.02
Vested	(1,273,796	)	27.26			(13,683	)	47.61
Forfeited	(406,343	)	28.68			(12,308	)	47.61
Nonvested at December 31, 2018	1,737,554		$	32.83		346,792		$	49.13

Additional Disclosures for Equity-Based Plans

	RSUs										RSAs
	Year Ended December 31,										Year Ended December 31,
Additional Disclosures for equity-based plans	2018			2017			2016				2018			2017			2016
Total grant date fair value of shares granted (in millions)	$	34		$	46		$	42			$	18		$	—		$	—
Total grant date fair value of shares vested (in millions)	$	35		$	21		$	16			$	1		$	—		$	—
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees	451,875			335,101			217,769				6,357			—			—

Weighted-Average Assumptions Used to Estimate Fair Value of Stock Options

	ESPP Assumptions
Year Ended December 31,	Expected Term (in Years)	Expected Volatility	Risk-Free Interest Rate	Expected Dividend Yield
2018	0.50	27-37%	1.42-2.5%	0	%
2017	0.50	28-37%	0.62-1.42%	0	%
2016	0.50	32-76%	0.33-0.62%	0	%

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: 

	Year Ended December 31,
(in millions)	2018			2017			2016
Cost of providing services	$	10		$	8		$	7
Sales and marketing	8			6			6
General and administrative	22			14			11
Systems development and programming costs	4			4			2
Total stock-based compensation expense	$	44		$	32		$	26
Income tax benefit related to stock-based compensation expense	$	11		$	7		$	9
Tax benefit realized from stock options exercised and similar awards	$	23		$	28		$	7

Summary of Unrecognized Compensation Expense

The table below summarizes unrecognized compensation expense for the year ended December 31, 2018 associated with the following:

	Amount (in millions)			Weighted-Average Period (in Years)
Nonvested stock options	$	—		0.11
Nonvested RSUs	49			2.07
Nonvested RSAs	12			2.44

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