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Long-term Customer Financing and Sales Of Receivables (Proceeds Received From Non-Recourse Sales Of Accounts Receivable And Long-Term Receivables) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Receivables [Abstract]      
Accounts receivable sales proceeds $ 50msi_AccountsReceivableSalesProceeds $ 14msi_AccountsReceivableSalesProceeds $ 12msi_AccountsReceivableSalesProceeds
Long-term receivables sales proceeds 124msi_LongTermReceivablesSalesProceeds 131msi_LongTermReceivablesSalesProceeds 178msi_LongTermReceivablesSalesProceeds
Total proceeds from receivable sales $ 174us-gaap_ProceedsFromSaleAndCollectionOfReceivables $ 145us-gaap_ProceedsFromSaleAndCollectionOfReceivables $ 190us-gaap_ProceedsFromSaleAndCollectionOfReceivables