Deferred Revenue And Performance Obligations Narratives (Details) $ in Billions	Sep. 28, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 1.0
Revenue Recognition Over Remaining Obligations Over Next 12 Months [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Percentage	73.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months
Revenue Recognition Over Remaining Obligations Over Next 24 Months [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Percentage	16.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	24 months