Business and Summary of Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Deferred Revenue [Line Items]
Deferred Revenue	$ 73	$ 61
Deferred Costs	$ 43	33
Product's Estimate Useful Life [Member]
Deferred Revenue [Line Items]
Product's Estimated Life	4 years
Other Current Assets [Member]
Deferred Revenue [Line Items]
Deferred Costs, Current	$ 17	12
Other Noncurrent Assets [Member]
Deferred Revenue [Line Items]
Deferred Costs, Noncurrent	26	22
Other Current Liabilities [Member]
Deferred Revenue [Line Items]
Deferred Revenue, Current	30	21
Other Noncurrent Liabilities [Member]
Deferred Revenue [Line Items]
Deferred Revenue, Noncurrent	$ 43	$ 40