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Reorganization of Business (Net Charges Incurred By Business Segment) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Restructuring Cost and Reserve [Line Items]    
Reorganization of business charges $ 14us-gaap_RestructuringSettlementAndImpairmentProvisions $ 10us-gaap_RestructuringSettlementAndImpairmentProvisions
Products    
Restructuring Cost and Reserve [Line Items]    
Reorganization of business charges 10us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ProductMember		 6us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_ProductMember
Services    
Restructuring Cost and Reserve [Line Items]    
Reorganization of business charges $ 4us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= msi_ServicesMember		 $ 4us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= msi_ServicesMember