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STOCK BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Stock Option Activity Under Equity-Based Plans

The following table summarizes stock option activity for the year ended December 31, 2023:

			Number of Shares			Weighted Average Exercise Price			Weighted Average Remaining Contractual Term (in years)			Aggregate Intrinsic Value (in millions)
Balance at December 31, 2022			190,275			$	20.50		1.5			$	9
Exercised			(182,067)			20.50						14
Balance at December 31, 2023 (1)			8,208			$	19.50		0.45			$	1

(1)    All options are vested and exercisable.

Schedule of Additional Disclosure for Stock Options

			Year Ended December 31,
Additional Disclosures for Stock Options (in millions)			2023			2022			2021
Total intrinsic value of options exercised			14			8			6
Cash received from options exercised			4			1			1

Schedule of RSU and RSA Activity Under Equity-Based Plans

The following tables summarize RSU activity for the year ended December 31, 2023:

Time-based RSUs

			Total Number of RSUs									Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2022			1,198,561									$	80.75
Granted			769,286									78.27
Vested			(617,937)									76.25
Forfeited			(120,708)									82.58
Nonvested at December 31, 2023			1,229,202									$	80.88

			Year Ended December 31,
Additional Disclosures for equity-based plans			2023			2022			2021
Total grant date fair value of shares granted (in millions)			$	60		$	85		$	47
Total grant date fair value of shares vested (in millions)			$	47		$	42		$	34
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees			213,569			204,191			207,603

Performance-based RSUs

						Total Number Shares			Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2022						202,586			$	86.82
Granted						177,067			79.05
Vested						(156,642)			86.22
Nonvested at December 31, 2023						223,011			$	81.08

Schedule of Additional Disclosures for Equity-Based Plans

			Year Ended December 31,
Additional Disclosures for equity-based plans			2023			2022			2021
Total grant date fair value of shares granted (in millions) (1)			$	14		$	20		$	16
Total grant date fair value of shares vested (in millions)			$	14		$	17		$	8
Shares withheld to settle payroll tax liabilities related to vesting of shares held by employees			74,923			119,901			77,787

(1)    Amount includes fair value of finalized additional grant related to the most recently ended performance period.

Schedule of 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)			2023			2022			2021
Expected Term (in Years)			0.5			0.5			0.5
Expected Volatility			29-35%			21-39%			21-35%
Risk-Free Interest Rate			5.3-5.4%			0.7-4.5%			0.4-0.7%
Expected Dividend Yield			0		%	0		%	0		%
Shares Issued under ESPP			175,446			158,134			136,861

Schedule of 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)			2023			2022			2021
Cost of providing services			$	14		$	13		$	12
Sales and marketing			8			7			6
General and administrative			33			38			29
Systems development and programming costs			4			4			3
Total stock based compensation expense			$	59		$	62		$	50
Total stock based compensation capitalized			$	3		$	1		$	1
Income tax benefit related to stock based compensation expense			$	13		$	13		$	10
Tax benefit realized			$	19		$	14		$	16

The table below summarizes unrecognized compensation expense for the year ended December 31, 2023 associated with the following:

			Amount (in millions)			Weighted-Average Period (in Years)
Nonvested time based RSUs			$	92		2.47
Nonvested performance based RSUs			10			1.66

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