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Document and Entity Information
Sep. 30, 2019
Document And Entity Information [Line Items]  
Amendment Flag false
Entity Central Index Key 0000097745
Document Type 8-K
Document Period End Date Sep. 30, 2019
Entity Registrant Name THERMO FISHER SCIENTIFIC INC.
Entity Incorporation State Country Code DE
Entity File Number 1-8002
Entity Tax Identification Number 04-2209186
Entity Address, Address Line One 168 Third Avenue
Entity Address, City or Town Waltham
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02451
City Area Code (781)
Local Phone Number 622-1000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, $1.00 par value
Trading Symbol TMO
Security Exchange Name NYSE
Floating Rate Notes Due 20202 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Floating Rate Notes due 2020
Trading Symbol TMO /20A
Security Exchange Name NYSE
M 1.500 Notes Due 20201 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.500% Notes due 2020
Trading Symbol TMO 20A
Security Exchange Name NYSE
Senior Notes 2.15 Due 2022 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 2.150% Notes due 2022
Trading Symbol TMO 22A
Security Exchange Name NYSE
Senior Notes 0.75 Due 2024 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 0.750% Notes due 2024
Trading Symbol TMO 24A
Security Exchange Name NYSE
Senior Notes 200 Due 2025 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 2.000% Notes due 2025
Trading Symbol TMO 25
Security Exchange Name NYSE
Senior Notes 1.40 Due 2026 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.400% Notes due 2026
Trading Symbol TMO 26A
Security Exchange Name NYSE
A 1.45 Senior Notes Due 2027 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.450% Notes due 2027
Trading Symbol TMO 27
Security Exchange Name NYSE
Senior Notes 1.375 Due 2028 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.375% Notes due 2028
Trading Symbol TMO 28
Security Exchange Name NYSE
Senior Notes 1.95 Due 2029 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 1.950% Notes due 2029
Trading Symbol TMO 29
Security Exchange Name NYSE
Senior Notes 2.875 Due 2037 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 2.875% Notes due 2037
Trading Symbol TMO 37
Security Exchange Name NYSE