Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Dec. 30, 2017
Deferred Revenue Arrangement [Line Items]
Deferred Revenue	$ 71	$ 71	$ 73
Deferred Costs	45	45	43
Revenue recognized, included in beginning deferred revenue balance	8	$ 16
Nonsoftware Service, Support and Maintenance Arrangement [Member]
Deferred Revenue Arrangement [Line Items]
Product's Estimated Life		4 years
Other Current Liabilities [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Current	31	$ 31	30
Other Noncurrent Liabilities [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Noncurrent	40	40	43
Other Current Assets [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Costs, Current	19	19	17
Other Noncurrent Assets [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Costs, Noncurrent	$ 26	$ 26	$ 26