v3.26.1
Revenues - Summary of Revenues by Type (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues $ 1,954 $ 1,785 $ 4,041 $ 3,685
Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues [1] 1,954 1,785 [2] 4,041 3,685 [2]
Recurring [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues 1,601 1,463 [2] 3,196 2,914 [2]
Transactions [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues 242 208 [2] 622 541 [2]
Global Print [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues 111 114 [2] 223 230 [2]
Legal Professionals [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues [1] 772 704 [2] 1,528 1,392 [2]
Legal Professionals [member] | Recurring [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues 748 684 [2] 1,487 1,354 [2]
Legal Professionals [member] | Transactions [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues 24 20 [2] 41 38 [2]
Corporates [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues [1] 537 480 [2] 1,145 1,028 [2]
Corporates [member] | Recurring [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues 462 421 [2] 911 828 [2]
Corporates [member] | Transactions [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues 75 59 [2] 234 200 [2]
Tax, Audit & Accounting Professionals [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues [1] 311 274 [2] 721 632 [2]
Tax, Audit & Accounting Professionals [member] | Recurring [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues 209 187 [2] 438 392 [2]
Tax, Audit & Accounting Professionals [member] | Transactions [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues 102 87 [2] 283 240 [2]
Reuters [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues [1] 229 218 [2] 441 414 [2]
Reuters [member] | Recurring [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues 188 176 [2] 374 351 [2]
Reuters [member] | Transactions [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues 41 42 [2] 67 63 [2]
Global Print [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues [1] 111 114 [2] 223 230 [2]
Global Print [member] | Global Print [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues 111 114 [2] 223 230 [2]
Eliminations/ Rounding [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues [1] (6) (5) [2] (17) (11) [2]
Eliminations/ Rounding [member] | Recurring [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues $ (6) $ (5) [2] (14) $ (11) [2]
Eliminations/ Rounding [member] | Transactions [member] | Operating segments [member]        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Revenues     $ (3)  
[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.