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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

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