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STOCK BASED COMPENSATION - Stock Based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Additional Disclosures for equity-based plans
Total stock based compensation expense	$ 43	$ 41	$ 44
Total stock based compensation capitalized	1	1	0
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
Cost of providing services
Additional Disclosures for equity-based plans
Total stock based compensation expense	9	8	10
Sales and marketing
Additional Disclosures for equity-based plans
Total stock based compensation expense	6	3	8
General and administrative
Additional Disclosures for equity-based plans
Total stock based compensation expense	26	28	22
Systems development and programming costs
Additional Disclosures for equity-based plans
Total stock based compensation expense	$ 2	$ 2	$ 4

X

- Definition

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

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