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Reorganization Of Businesses (Net Charges Incurred By Business Segment) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]      
Reorganization of business charges $ 73us-gaap_RestructuringSettlementAndImpairmentProvisions $ 86us-gaap_RestructuringSettlementAndImpairmentProvisions $ 33us-gaap_RestructuringSettlementAndImpairmentProvisions
Products      
Restructuring Cost and Reserve [Line Items]      
Reorganization of business charges 48us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= msi_ProductsMember		 57us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= msi_ProductsMember		 22us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= msi_ProductsMember
Services      
Restructuring Cost and Reserve [Line Items]      
Reorganization of business charges $ 25us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= msi_ServicesMember		 $ 29us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= msi_ServicesMember		 $ 11us-gaap_RestructuringSettlementAndImpairmentProvisions
/ us-gaap_StatementBusinessSegmentsAxis
= msi_ServicesMember