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STOCK BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Additional Disclosures for equity-based plans
Total stock based compensation expense	$ 50	$ 43	$ 41
Total stock based compensation capitalized	1	1	1
Income tax benefit related to stock based compensation expense	10	9	11
Tax benefit realized from stock options exercised and similar awards	16	14	18
Cost of providing services
Additional Disclosures for equity-based plans
Total stock based compensation expense	12	9	8
Sales and marketing
Additional Disclosures for equity-based plans
Total stock based compensation expense	6	6	3
General and administrative
Additional Disclosures for equity-based plans
Total stock based compensation expense	29	26	28
Systems development and programming costs
Additional Disclosures for equity-based plans
Total stock based compensation expense	$ 3	$ 2	$ 2

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

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