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Document and Entity Information
Oct. 17, 2025
Cover [Abstract]  
Document Type 8-K
Document Period End Date Oct. 17, 2025
Entity Registrant Name Willis Towers Watson PLC
Entity Incorporation State Country Code L2
Entity File Number 001-16503
Entity Tax Identification Number 98-0352587
Entity Address Address Line 1 c/o Willis Group Limited, 51 Lime Street
Entity Address City Or Town London
Entity Address Postal Zip Code EC3M 7DQ
Entity Address Country GB
Country Region 44
City Area Code 20
Local Phone Number 3124-6000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Ordinary Shares, nominal value $0.000304635 per share
Trading Symbol WTW
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Entity Central Index Key 0001140536
Amendment Flag false