v3.26.1
Revenues - Summary of Geographical Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disclosure of geographical areas [line items]        
Revenues $ 1,954 $ 1,785 $ 4,041 $ 3,685
Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 1,954 1,785 [2] 4,041 3,685 [2]
U.S. [Member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 1,365 1,261 [2] 2,863 2,644 [2]
Canada [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 60 55 [2] 119 107 [2]
Other [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 105 81 [2] 200 158 [2]
Americas [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 1,530 1,397 [2] 3,182 2,909 [2]
U.K. [Member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 256 236 [2] 511 470 [2]
Other Countries [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 94 84 [2] 195 168 [2]
EMEA [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 350 320 [2] 706 638 [2]
Asia Pacific [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 74 68 [2] 153 138 [2]
Legal Professionals [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 772 704 [2] 1,528 1,392 [2]
Legal Professionals [member] | U.S. [Member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 603 549 [2] 1,194 1,092 [2]
Legal Professionals [member] | Canada [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 29 27 [2] 58 52 [2]
Legal Professionals [member] | Other [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 9 8 [2] 18 16 [2]
Legal Professionals [member] | Americas [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 641 584 [2] 1,270 1,160 [2]
Legal Professionals [member] | U.K. [Member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 82 74 [2] 164 146 [2]
Legal Professionals [member] | Other Countries [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 14 13 [2] 27 24 [2]
Legal Professionals [member] | EMEA [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 96 87 [2] 191 170 [2]
Legal Professionals [member] | Asia Pacific [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 35 33 [2] 67 62 [2]
Corporates [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 537 480 [2] 1,145 1,028 [2]
Corporates [member] | U.S. [Member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 390 362 [2] 837 780 [2]
Corporates [member] | Canada [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 11 9 [2] 22 18 [2]
Corporates [member] | Other [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 32 23 [2] 61 46 [2]
Corporates [member] | Americas [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 433 394 [2] 920 844 [2]
Corporates [member] | U.K. [Member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 43 38 [2] 88 76 [2]
Corporates [member] | Other Countries [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 45 35 [2] 98 76 [2]
Corporates [member] | EMEA [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 88 73 [2] 186 152 [2]
Corporates [member] | Asia Pacific [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 16 13 [2] 39 32 [2]
Tax, Audit & Accounting Professionals [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 311 274 [2] 721 632 [2]
Tax, Audit & Accounting Professionals [member] | U.S. [Member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 227 204 [2] 558 499 [2]
Tax, Audit & Accounting Professionals [member] | Canada [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 11 10 [2] 22 20 [2]
Tax, Audit & Accounting Professionals [member] | Other [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 58 44 [2] 111 85 [2]
Tax, Audit & Accounting Professionals [member] | Americas [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 296 258 [2] 691 604 [2]
Tax, Audit & Accounting Professionals [member] | U.K. [Member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 8 9 [2] 15 15 [2]
Tax, Audit & Accounting Professionals [member] | Other Countries [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 2 1 [2] 4 3 [2]
Tax, Audit & Accounting Professionals [member] | EMEA [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 10 10 [2] 19 18 [2]
Tax, Audit & Accounting Professionals [member] | Asia Pacific [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 5 6 [2] 11 10 [2]
Reuters [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 229 218 [2] 441 414 [2]
Reuters [member] | U.S. [Member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 64 61 [2] 116 102 [2]
Reuters [member] | Canada [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 2 1 [2] 3 2 [2]
Reuters [member] | Other [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 3 3 [2] 5 5 [2]
Reuters [member] | Americas [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 69 65 [2] 124 109 [2]
Reuters [member] | U.K. [Member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 115 107 [2] 228 217 [2]
Reuters [member] | Other Countries [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 32 34 [2] 63 63 [2]
Reuters [member] | EMEA [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 147 141 [2] 291 280 [2]
Reuters [member] | Asia Pacific [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 13 12 [2] 26 25 [2]
Global Print [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 111 114 [2] 223 230 [2]
Global Print [member] | U.S. [Member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 87 90 [2] 175 182 [2]
Global Print [member] | Canada [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 7 8 [2] 14 15 [2]
Global Print [member] | Other [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 3 3 [2] 5 6 [2]
Global Print [member] | Americas [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 97 101 [2] 194 203 [2]
Global Print [member] | U.K. [Member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 8 8 [2] 16 16 [2]
Global Print [member] | Other Countries [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 1 1 [2] 3 2 [2]
Global Print [member] | EMEA [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 9 9 [2] 19 18 [2]
Global Print [member] | Asia Pacific [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] 5 4 [2] 10 9 [2]
Eliminations/ Rounding [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] (6) (5) [2] (17) (11) [2]
Eliminations/ Rounding [member] | U.S. [Member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] (6) (5) [2] (17) (11) [2]
Eliminations/ Rounding [member] | Americas [member] | Operating segments [member]        
Disclosure of geographical areas [line items]        
Revenues [1] $ (6) $ (5) [2] $ (17) $ (11) [2]
[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.
[2] The Company revised its Legal Professionals, Corporates and Tax, Audit & Accounting Professionals segment results for the three and six months ended June 30, 2025. See note 1.