Participant rollovers EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Deemed distribution of participants loans EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Increase (Decrease) from Deemed Distribution Legal Entity [Axis] Legal Entity [Axis] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual Fund [Member] Mutual Fund [Member] EBP, Other Investment [Member] EBP, Other Investment [Member] EBP, Note Receivable from Participant, Loan Term EBP, Note Receivable from Participant, Loan Term EBP, Note Receivable from Participant, Loan Term Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Total deductions EBP, Change in Net Asset Available for Benefit, Decrease EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Text Block] EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Investments, at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Subsequent Event Type [Domain] Subsequent Event Type [Domain] Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 1 [Member] EBP, Reconciliation of Financial Statement to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] EBP, Investment, Fair Value and NAV [Abstract] EBP, Asset [Abstract] EBP, Asset [Abstract] EBPVesting Service Requirement Period, Employer Contributions EBPVesting Service Requirement Period, Employer Contributions EBPVesting Service Requirement Period, Employer Contributions Additions EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Payment to Participant EBP, Payment to Participant [Policy Text Block] Transfers into (from) the Plan EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan Amendment Flag Amendment Flag Deemed distribution of participants loans EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Deemed Distribution EBP, Basis of Accounting [Policy Text Block] EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] EBP, Investment, Number of Shares EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables EBP, Receivable [Abstract] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] Investments [Domain] Investments [Domain] EBP, Note Receivable from Participant, Interest Rate Range, High End EBP, Note Receivable from Participant, Interest Rate Range, High End EBP, Note Receivable from Participant, Interest Rate Range, High End Use of Estimate EBP, Use of Estimate [Policy Text Block] EBP, Schedule of Asset Held for Investment EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Investment Type [Axis] Investment Type [Axis] Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Participants EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] EBP, Participant Contribution, After Tax, Maximum Annual Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, After Tax, Maximum Annual Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, After Tax, Maximum Annual Contribution to Eligible Compensation, Percentage EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Form 5500 Caption, Net Income (Loss) [Abstract] EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] EBP, Description of Plan EBP, Description of Plan [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Tax Determination Letter, Date EBP, Tax Determination Letter, Date Fixed Income Funds Fixed Income Funds [Member] EBP, Employer, Common Stock [Member] EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Form 5500 Caption, Net Assets [Abstract] EBP, Form 5500 Caption, Net Assets [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Total additions EBP, Change in Net Asset Available for Benefit, Increase Investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense EBP, Asset Held for Investment EBP, Asset Held for Investment EBPRelatedPartyAndPartyInInterestDividendIncome EBPRelatedPartyAndPartyInInterestDividendIncome Amount of dividend income on employer common stock held in related-party and party-in-interest transactions by an employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Risk and Uncertainty EBP, Risk and Uncertainty [Policy Text Block] Document Information [Line Items] Document Information [Line Items] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract] EBP, Plan-level account balance EBP, Plan-level account balance EBP, Plan-level account balance EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] EBP, Tax Determination Letter, Obtained [true false] EBP, Tax Determination Letter, Obtained [true false] Net increase in assets available for plan benefits per the Form 5500 EBP, Form 5500 Caption, Net Income (Loss) Subsequent Event Type [Axis] Subsequent Event Type [Axis] EBP, Tax Status [Table] EBP, Tax Status [Table] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) EBP, Change in Net Asset Available for Benefit, Increase (Decrease) EBP, Related Party and Party-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Total receivables EBP, Receivable EBP, Tax Qualification Status [Extensible Enumeration] EBP, Tax Qualification Status [Extensible Enumeration] Employer contributions EBP, Employer Contribution, Receivable EBP, Vesting Percentage EBP, Vesting Percentage EBP, Vesting Percentage EBP, Participant Contribution, Automatic, Deferral Rate EBP, Participant Contribution, Automatic, Deferral Rate Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Dividend income EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Statement of Net Asset Available for Benefit [Abstract] Guaranteed investment contract fund Guaranteed Investment Contract [Member] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] tmo_EBPEmployeeBenefitPlanParticipantContributionPretaxAndRothMaximumAnnualCompensationToTotalCompensationPercentage EBPEmployeeBenefitPlanParticipantContributionPretaxAndRothMaximumAnnualCompensationToTotalCompensationPercentage EBPEmployeeBenefitPlanParticipantContributionPretaxAndRothMaximumAnnualCompensationToTotalCompensationPercentage EBP, Tax Status [Abstract] EBP, Employer, Common Stock Fund EBP, Employer, Common Stock Fund [Member] Document Period End Date Document Period End Date EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Note Receivable from Participant, Loan Term for Primary Residence EBP, Note Receivable from Participant, Loan Term for Primary Residence EBP, Note Receivable from Participant, Loan Term for Primary Residence EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Expense EBP, Expense [Policy Text Block] EBP, Reconciliation of Financial Statement to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Stable value investment funds EBPStable value investment [Member] EBPStable value investment Investment EBP, Investment [Policy Text Block] EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Asset Held for Investment, Party-in-Interest [true false] Document Type Document Type EBP, Plan Termination EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Common Collective Trust [Member] Common Collective Trust [Member] EBP, Note Receivable from Participant, Interest Rate Range, Low End EBP, Note Receivable from Participant, Interest Rate Range, Low End EBP, Note Receivable from Participant, Interest Rate Range, Low End EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Administrative expenses paid from plan-level account EBPAdministrative expenses paid from plan-level account EBPAdministrative expenses paid from plan-level account Deductions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] EBP, Forfeited Nonvested Account, Decrease from Employer Contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution EBP, Note Receivable from Participant EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Summary of Accounting Policy EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Net increase in assets available for plan benefits per the financial statements Net increase in assets available for plan benefits per the financial statements ebpEmployee​Benefit​Plan​Change​In​Net​Asset​Available​For​Benefit​Increase​DecreaseAfterTransfers ebpEmployee​Benefit​Plan​Change​In​Net​Asset​Available​For​Benefit​Increase​DecreaseAfterTransfers Document Fiscal Period Focus Document Fiscal Period Focus EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost Equity funds Equity Funds [Member] EBP, Investment, Excluding Plan Interest in Master Trust, Cost EBP, Investment, Excluding Plan Interest in Master Trust, Cost Subsequent Event EBP, Subsequent Event [Policy Text Block] EBP, Tax Status EBP, Tax Status [Text Block] EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Revenue credit EBP, Revenue credit EBP, Revenue credit Document Information [Table] Document Information [Table] Note Receivable from Participant EBP, Note Receivable from Participant [Policy Text Block] Total investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Asset allocation funds EBPAsset allocation funds [Member] EBPAsset allocation funds EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Net assets available for plan benefits per the financial statements EBP, Net Asset Available for Benefit, Beginning Balance EBP, Net Asset Available for Benefit, Ending Balance Net assets available for plan benefits per the financial statements EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] EBP, Forfeited Nonvested Account EBP, Forfeited Nonvested Account EBP, Employer Contribution, Matching Percentage EBP, Employer Contribution, Matching Percentage Net assets available for plan benefits per the Form 5500 EBP, Form 5500 Caption, Net Assets EBP 001 EBP 001 [Member] EBP 001 Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items] Qualified Plan [Member]