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Income Taxes (Federal Statutory Tax Rate And Income Tax Expense) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Income tax expense at statutory rate $ (406)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 308us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 308us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax on non-U.S. earnings (27)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 17us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (10)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
State income taxes, net of federal benefit (30)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 8us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (32)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Recognition of previously unrecognized income tax benefits (29)us-gaap_IncomeTaxReconciliationDispositionOfBusiness 6us-gaap_IncomeTaxReconciliationDispositionOfBusiness 0us-gaap_IncomeTaxReconciliationDispositionOfBusiness
Other provisions 9us-gaap_IncomeTaxReconciliationOtherAdjustments (4)us-gaap_IncomeTaxReconciliationOtherAdjustments (10)us-gaap_IncomeTaxReconciliationOtherAdjustments
Valuation allowances 55msi_IncomeTaxReconciliationValuationAllowances (3)msi_IncomeTaxReconciliationValuationAllowances (60)msi_IncomeTaxReconciliationValuationAllowances
Section 199 deduction (12)msi_IncomeTaxReconciliationDeductionsSectionOneNineNineDeduction (14)msi_IncomeTaxReconciliationDeductionsSectionOneNineNineDeduction (14)msi_IncomeTaxReconciliationDeductionsSectionOneNineNineDeduction
Tax on undistributed non-U.S. earnings (19)msi_IncomeTaxReconciliationTaxOnUndistributedNonUSEarnings (22)msi_IncomeTaxReconciliationTaxOnUndistributedNonUSEarnings 29msi_IncomeTaxReconciliationTaxOnUndistributedNonUSEarnings
Research credits (6)us-gaap_IncomeTaxReconciliationTaxCreditsResearch (18)us-gaap_IncomeTaxReconciliationTaxCreditsResearch 0us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Tax benefit of repatriated non-U.S. earnings 0us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings (337)us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings 0us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
Total income tax expense (benefit) $ (465)us-gaap_IncomeTaxExpenseBenefit $ (59)us-gaap_IncomeTaxExpenseBenefit $ 211us-gaap_IncomeTaxExpenseBenefit