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Commitments And Contingencies (Narrative) (Details)
$ in Millions
9 Months Ended
Oct. 02, 2016
USD ($)
Purchase Obligation [Line Items]  
Lease Expiration Date Dec. 31, 2026
Purchase Commitment, Remaining Minimum Amount Committed $ 161
Number of days for non-cancellation of purchase obligations prior to expected shipment date 30 days
46 To 60 Days [Member]  
Purchase Obligation [Line Items]  
Percentage of cancelable orders. 50.00%
31 To 45 Days [Member]  
Purchase Obligation [Line Items]  
Percentage of cancelable orders. 25.00%
Minimum [Member] | 46 To 60 Days [Member]  
Purchase Obligation [Line Items]  
Required Notice Period Prior To The Expected Shipment Date 46 days
Minimum [Member] | 31 To 45 Days [Member]  
Purchase Obligation [Line Items]  
Required Notice Period Prior To The Expected Shipment Date 31 days
Maximum [Member] | 46 To 60 Days [Member]  
Purchase Obligation [Line Items]  
Required Notice Period Prior To The Expected Shipment Date 60 days
Maximum [Member] | 31 To 45 Days [Member]  
Purchase Obligation [Line Items]  
Required Notice Period Prior To The Expected Shipment Date 45 days
ITALY | Earliest Tax Year [Member]  
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2004
ITALY | Latest Tax Year [Member]  
Income Tax Examination [Line Items]  
Income Tax Examination, Year under Examination 2012