Long-term Customer Financing And Sales Of Receivables (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 29, 2014	Dec. 31, 2013
Long-Term Customer Financing And Sales Of Receivables [Abstract]
Accrued interest on loans	$ 0
Commitments to provide long-term financing	223	120
Servicing obligations for long-term receivables	418	434
Financing receivables past due over 90 days	$ 12	$ 10

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The amount of outstanding commitments to provide long-term financing to third parties.

+ References

No definition available.

+ Details

Name:	msi_LongTermFinancing
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the amount of sold long-term receivables for which the entity has retained servicing obligations.

+ References

No definition available.

+ Details

Name:	msi_ServiceObligationForLongTermReceivables
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
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- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

+ Details

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