Deferred Revenue And Performance Obligations Narratives (Details) $ in Billions	3 Months Ended
	Mar. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 1.0
Minimum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Revenue Recognized Over Respective Periods, Percent	73.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	12 months
Maximum
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Revenue Recognized Over Respective Periods, Percent	16.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	24 months