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Debt and Other Financing Arrangements - Commercial Paper Programs (Details) - Commercial Paper	3 Months Ended
	Mar. 28, 2026
U.S. Commercial Paper Program
Short-term Financing [Line Items]
Maximum maturity period	397 days
Euro Commercial Paper Program
Short-term Financing [Line Items]
Maximum maturity period	183 days

X

- Definition

Maximum maturity period allowed under U.S. commercial paper program

+ References

No definition available.

+ Details

Name:	tmo_MaximumPeriodToMaturityAllowedUnderProgram
Namespace Prefix:	tmo_
Data Type:	xbrli:durationItemType
Balance Type:	na
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_ShortTermDebtLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DebtInstrumentAxis=tmo_U.S.CommercialPaperProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_CommercialPaperMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=tmo_EuroCommercialPaperProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: