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Business Acquisition (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2019	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Revenues		$ 1,158	$ 1,420
Goodwill		3,171			$ 3,408
Health Solutions Plus [Member]
Business Acquisition [Line Items]
Revenues		4
Business Combination, Consideration Transferred	$ 90	90
Business Combination, Contingent Consideration, Liability		7
Business Acquisition, Total consideration		97
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		10
Goodwill		48
Intangible Assets, Net (Including Goodwill)		87
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		97
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		$ 8
Business Combination, Contingent Consideration Arrangements Period		2 years
Goodwill, Portion Currently Not Tax Deductible				$ 7
Income (Loss) from Subsidiaries, before Tax		$ 3
Developed Technology [Member] | Health Solutions Plus [Member]
Business Acquisition [Line Items]
Estimated Useful Lives		7 years
Finite-Lived Intangible Assets, Gross		$ 20
Customer Relationships [Member] | Health Solutions Plus [Member]
Business Acquisition [Line Items]
Estimated Useful Lives		15 years
Finite-Lived Intangible Assets, Gross		$ 18
Trademarks and Trade Names [Member] | Health Solutions Plus [Member]
Business Acquisition [Line Items]
Estimated Useful Lives		1 year 6 months
Finite-Lived Intangible Assets, Gross		$ 1

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Business Acquisition, Total consideration

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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