Segment Information - Summary of Operating Results of Reportable Segments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [Line Items]    
Revenues $ 6,348 $ 5,984
Reportable segments adjusted EBITDA 2,295 2,106
Corporate costs (325) (131)
Fair value adjustments (see note 5) 8 10
Depreciation (177) (184)
Other operating gains, net 34 736
Operating profit 1,242 1,929
Net interest expense (196) (195)
Other finance income 8 30
Share of post-tax earnings (losses) in equity method investments 6,240 (544)
Tax expense (1,607) (71)
Earnings from continuing operations 5,687 1,149
Operating segments [member] | Legal Professionals [member]    
Disclosure of operating segments [Line Items]    
Revenues 2,712 2,535
Reportable segments adjusted EBITDA 1,091 1,001
Operating segments [member] | Corporates [member]    
Disclosure of operating segments [Line Items]    
Revenues 1,449 1,367
Reportable segments adjusted EBITDA 502 460
Operating segments [member] | Tax & Accounting Professionals [member]    
Disclosure of operating segments [Line Items]    
Revenues 906 836
Reportable segments adjusted EBITDA 373 330
Operating segments [member] | Reuters News [member]    
Disclosure of operating segments [Line Items]    
Revenues 674 628
Reportable segments adjusted EBITDA 103 73
Operating segments [member] | Global Print [member]    
Disclosure of operating segments [Line Items]    
Revenues 609 620
Reportable segments adjusted EBITDA 226 242
Operating segments [member] | Eliminations [member]    
Disclosure of operating segments [Line Items]    
Revenues (2) (2)
Computer software [member]    
Disclosure of operating segments [Line Items]    
Amortization (474) (485)
Other identifiable intangible assets [member]    
Disclosure of operating segments [Line Items]    
Amortization $ (119) $ (123)