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Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Additional Disclosures for equity-based plans
Total stock-based compensation expense	$ 44	$ 32	$ 26
Income tax benefit related to stock-based compensation expense	11	7	9
Tax benefit realized from stock options exercised and similar awards	23	28	7
Cost of providing services
Additional Disclosures for equity-based plans
Total stock-based compensation expense	10	8	7
Sales and marketing
Additional Disclosures for equity-based plans
Total stock-based compensation expense	8	6	6
General and administrative
Additional Disclosures for equity-based plans
Total stock-based compensation expense	22	14	11
Systems development and programming costs
Additional Disclosures for equity-based plans
Total stock-based compensation expense	$ 4	$ 4	$ 2

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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