v3.25.4
Revenues - Summary of Geographical Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of geographical areas [line items]    
Revenues $ 7,476 $ 7,258
Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 7,476 7,258
U.S. [Member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 5,363 5,304
Canada [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 212 205
Other [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 332 292
Americas [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 5,907 5,801
U.K. [Member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 954 898
Other Countries [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 334 294
EMEA [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 1,288 1,192
Asia Pacific [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 281 265
Legal Professionals [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 2,868 2,922
Legal Professionals [member] | U.S. [Member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 2,238 2,352
Legal Professionals [member] | Canada [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 114 103
Legal Professionals [member] | Other [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 33 31
Legal Professionals [member] | Americas [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 2,385 2,486
Legal Professionals [member] | U.K. [Member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 302 272
Legal Professionals [member] | Other Countries [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 51 43
Legal Professionals [member] | EMEA [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 353 315
Legal Professionals [member] | Asia Pacific [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 130 121
Corporates [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 1,987 1,844
Corporates [member] | U.S. [Member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 1,515 1,431
Corporates [member] | Canada [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 15 14
Corporates [member] | Other [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 98 85
Corporates [member] | Americas [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 1,628 1,530
Corporates [member] | U.K. [Member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 155 141
Corporates [member] | Other Countries [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 144 120
Corporates [member] | EMEA [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 299 261
Corporates [member] | Asia Pacific [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 60 53
Tax, Audit & Accounting Professionals [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 1,302 1,165
Tax, Audit & Accounting Professionals [member] | U.S. [Member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 1,033 926
Tax, Audit & Accounting Professionals [member] | Canada [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 41 38
Tax, Audit & Accounting Professionals [member] | Other [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 180 155
Tax, Audit & Accounting Professionals [member] | Americas [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 1,254 1,119
Tax, Audit & Accounting Professionals [member] | U.K. [Member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 26 25
Tax, Audit & Accounting Professionals [member] | Other Countries [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 4 4
Tax, Audit & Accounting Professionals [member] | EMEA [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 30 29
Tax, Audit & Accounting Professionals [member] | Asia Pacific [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 18 17
Reuters [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 853 832
Reuters [member] | U.S. [Member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 219 219
Reuters [member] | Canada [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 5 6
Reuters [member] | Other [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 10 9
Reuters [member] | Americas [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 234 234
Reuters [member] | U.K. [Member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 436 425
Reuters [member] | Other Countries [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 130 121
Reuters [member] | EMEA [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 566 546
Reuters [member] | Asia Pacific [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 53 52
Global Print [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 490 519
Global Print [member] | U.S. [Member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 382 400
Global Print [member] | Canada [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 37 44
Global Print [member] | Other [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 11 12
Global Print [member] | Americas [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 430 456
Global Print [member] | U.K. [Member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 35 35
Global Print [member] | Other Countries [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 5 6
Global Print [member] | EMEA [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 40 41
Global Print [member] | Asia Pacific [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] 20 22
Eliminations/ Rounding [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] (24) (24)
Eliminations/ Rounding [member] | U.S. [Member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] (24) (24)
Eliminations/ Rounding [member] | Americas [member] | Operating segments [member]    
Disclosure of geographical areas [line items]    
Revenues [1] $ (24) $ (24)
[1] Revenues by geography are based on the location of the customer. Revenues from the Reuters agreement with the Data & Analytics business of London Stock Exchange Group ("LSEG"), the Company’s largest customer, are included entirely in the U.K. Canada represents the Company's country of domicile. Americas represents North America, Latin America and South America and EMEA represents Europe, Middle East and Africa.