Investments (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Jul. 27, 2018
Schedule of Cost-method Investments [Line Items]
Proceeds from Sale of Available-for-sale Securities	$ 45	$ 29
Related Party Transaction, Description of Transaction	Concurrently with the execution of the SPA, we announced a strategic operating relationship with Lumeris Healthcare Outcomes, LLC ("Lumeris"), a subsidiary of Essence Group, pursuant to which we will collaborate to bring to market an EHR-agnostic offering, Maestro AdvantageTM, designed to help providers who participate in value-based arrangements, including Medicare Advantage and provider-sponsored health plans, control costs and improve outcomes. Additionally, we sold certain solutions to Lumeris for an aggregate contract value of $28 million, most of which is to be recognized as revenue ratably over the next two years
Essence Group Holdings Corporation [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments, Original Cost			$ 266