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STOCK BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Summary of Stock Option Activity Under Equity-Based Plans

The following table summarizes stock option activity for the year ended December 31, 2020:

			Number of Shares			Weighted Average Exercise Price			Weighted Average Remaining Contractual Term (in years)			Aggregate Intrinsic Value (in millions)
Balance at December 31, 2019			462,011			$	13.90		4.0			$	20
Exercised			(81,026)			8.70
Canceled			(1,000)			0.50
Balance at December 31, 2020			379,985			$	15.10		3.2			$	25
Vested and exercisable at December 31, 2020			379,985			$	15.10		3.2			$	25

Additional Disclosure for Stock Options

			Year Ended December 31,
Additional Disclosures for Stock Options (in millions)			2020			2019			2018
Total fair value of options vested			$	—		$	1		$	4
Total intrinsic value of options exercised			4			9			24
Cash received from options exercised			1			2			7

Summary of RSU and RSA Activity Under Equity-Based Plans

The following tables summarize RSU and RSA activity for the year ended December 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			932,517			—			932,517			54.00
Vested			(661,923)			(27,170)			(689,093)			45.02
Forfeited			(145,252)			(3,940)			(149,192)			51.86
Nonvested at December 31, 2020			1,230,071			30,026			1,260,097			$	54.04

			Year Ended December 31,
Additional Disclosures for equity-based plans			2020			2019			2018
Total grant date fair value of shares granted (in millions)			$	50		$	38		$	38
Total grant date fair value of shares vested (in millions)			$	31		$	30		$	28
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees			230,569			315,762			348,010

Performance-based RSUs and RSAs

			Total Number of RSUs			Total Number of RSAs			Total Number 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
Vested			(12,742)			(87,769)			(100,511)			49.28
Forfeited			(19,864)			(11,036)			(30,900)			50.98
Nonvested at December 31, 2020			167,127			16,052			183,179			$	52.89

Additional Disclosures for Equity-Based Plans

			Year Ended December 31,
Additional Disclosures for equity-based plans			2020			2019			2018
Total grant date fair value of shares granted (in millions)			$	10		$	4		$	14
Total grant date fair value of shares vested (in millions)			$	5		$	11		$	7
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees			48,787			135,877			110,222

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

In applying the Black Scholes option valuation model for the ESPP options, we use the following assumptions:

			Year Ended December 31,
(in millions)			2020			2019			2018
Expected Term (in Years)			0.5			0.5			0.5
Expected Volatility			40-83%			27-42%			27-37%
Risk-Free Interest Rate			0.2-1.6%			1.6-2.5%			1.42-2.5%
Expected Dividend Yield			0		%	0		%	0		%
Shares Issued under ESPP			236,887			207,324			175,966

Stock-based Compensation Expense

Stock based compensation expense and other disclosures for stock based awards made to our employees pursuant to the equity plans were as follows: 

			Year Ended December 31,
(in millions)			2020			2019			2018
Cost of providing services			$	9		$	8		$	10
Sales and marketing			6			3			8
General and administrative			26			28			22
Systems development and programming costs			2			2			4
Total stock based compensation expense			$	43		$	41		$	44
Total stock based compensation capitalized			$	1		$	1		$	—
Income tax benefit related to stock based compensation expense			$	9		$	11		$	11
Tax benefit realized from stock options exercised and similar awards			$	14		$	18		$	23

The table below summarizes unrecognized compensation expense for the year ended December 31, 2020 associated with the following:

			Amount (in millions)			Weighted-Average Period (in Years)
Nonvested RSUs			$	63		2.47
Nonvested RSAs			9			2.00

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