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STOCK BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Additional Disclosures for equity-based plans
Total stock based compensation expense	$ 62	$ 50	$ 43
Total stock based compensation capitalized	1	1	1
Income tax benefit related to stock based compensation expense	13	10	9
Tax benefit realized from stock options exercised and similar awards	14	16	14
Cost of providing services
Additional Disclosures for equity-based plans
Total stock based compensation expense	13	12	9
Sales and marketing
Additional Disclosures for equity-based plans
Total stock based compensation expense	7	6	6
General and administrative
Additional Disclosures for equity-based plans
Total stock based compensation expense	38	29	26
Systems development and programming costs
Additional Disclosures for equity-based plans
Total stock based compensation expense	$ 4	$ 3	$ 2

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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