v3.26.1
Segment Information - Summary of Operating Results of Reportable Segments (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disclosure of operating segments [Line Items]        
Revenues $ 1,954 $ 1,785 $ 4,041 $ 3,685
Reportable segments adjusted EBITDA 781 707 1,687 1,549
Corporate costs (36) (29) (61) (62)
Fair value adjustments (2) (17) 1 (34)
Depreciation (27) (28) (55) (55)
Other operating gains, net 68 5 68 2
Operating profit 558 436 1,197 999
Net interest expense (47) (35) (86) (65)
Other finance income (costs) 8 (48) 17 (58)
Share of post-tax losses in equity method investments (4) (4) (11) (10)
Tax expense (71) (52) (196) (144)
Earnings from continuing operations 444 297 921 722
Operating segments [member] | Legal Professionals [member]        
Disclosure of operating segments [Line Items]        
Revenues 772 704 1,528 1,392
Reportable segments adjusted EBITDA 371 339 736 675
Operating segments [member] | Corporates [member]        
Disclosure of operating segments [Line Items]        
Revenues 537 480 1,145 1,028
Reportable segments adjusted EBITDA 200 172 443 387
Operating segments [member] | Tax, Audit & Accounting Professionals [member]        
Disclosure of operating segments [Line Items]        
Revenues 311 274 721 632
Reportable segments adjusted EBITDA 120 110 341 318
Operating segments [member] | Reuters [member]        
Disclosure of operating segments [Line Items]        
Revenues 229 218 441 414
Reportable segments adjusted EBITDA 48 45 82 84
Operating segments [member] | Global Print [member]        
Disclosure of operating segments [Line Items]        
Revenues 111 114 223 230
Reportable segments adjusted EBITDA 42 41 85 85
Eliminations [member]        
Disclosure of operating segments [Line Items]        
Revenues (6) (5) (17) (11)
Software [Member]        
Disclosure of operating segments [Line Items]        
Amortization (201) (178) (394) (352)
Other identifiable intangible assets [member]        
Disclosure of operating segments [Line Items]        
Amortization $ (25) $ (24) $ (49) $ (49)