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Leases - Narrative (Details) $ in Millions	3 Months Ended
	Apr. 02, 2022 USD ($)
TETRA Ireland
Lessee, Lease, Description [Line Items]
Additional leases acquired	$ 34

X

- Definition

Lessee, Operating Lease, Additional Leases Acquired

+ References

No definition available.

+ Details

Name:	msi_LesseeOperatingLeaseAdditionalLeasesAcquired
Namespace Prefix:	msi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=msi_TETRAIrelandCommunicationsLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: