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Share-Based Compensation Plans - Schedule of Compensation Expense (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 29, 2025	Mar. 30, 2024
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense included in Operating earnings	$ 66	$ 56
Tax benefit	(14)	(11)
Share-based compensation expense, net of tax	$ 52	$ 45
Decrease in basic earnings per share (in USD per share)	$ (0.31)	$ (0.27)
Decrease in diluted earnings per share (in USD per share)	$ (0.31)	$ (0.27)
Costs of sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense included in Operating earnings	$ 14	$ 11
Selling, general and administrative expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense included in Operating earnings	35	30
Research and development expenditures
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense included in Operating earnings	$ 17	$ 15

X

- Definition

This element represents the increase (decrease) in basic earnings per share attributable to share-based compensation expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	msi_
Data Type:	dtr-types1:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the increase (decrease) in diluted earnings per share attributable to share-based compensation expense.

+ References

No definition available.

+ Details

Name:	msi_ShareBasedCompensationExpenseImpactOnEarningsPerShareDiluted
Namespace Prefix:	msi_
Data Type:	dtr-types1:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount, after tax, of expense for award under share-based payment arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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