Financial Instruments - Additional Information (Detail)
shares in Millions, $ in Millions, £ in Billions
1 Months Ended 12 Months Ended
Nov. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
Nov. 30, 2021
GBP (£)
Disclosure of detailed information about financial instruments [Line Items]        
Borrowings   $ 3,786 $ 3,772  
Notional amount $ 3,500 999 999 £ 2.6
Foreign currency translation adjustments to OCI   (61) (12)  
Cash and cash equivalents   778 1,787  
Trade and other receivables   1,057 1,151  
Other financial assets   370 664  
Fair value of contracts outstanding   $ (99) $ (100)  
Percent of change in revenue due to foreign currency translation   1.00% 1.00%  
Percent of change in operating expenses due to foreign currency translation   1.00% 1.00%  
Purchase price   $ 18 $ 167  
Net Proceeds Used For General Corporate Purposes     999  
Derivative financial assets   $ 99 100  
Percentage strengthening of US dollar against other foreign currencies   10.00%    
Target net debt to adjusted EBITDA   2.5x    
Foreign exchange gains   $ 27 9  
Equity method investments   6,736 $ 1,136  
Market value of LSEG shares   $ 6,800    
Thomson Reuters Ownership of YPL [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Number of shares held in associate | shares   72.4    
Lseg Shares [Member]        
Disclosure of detailed information about financial instruments [Line Items]        
Equity method investments   $ 680    
Equity interests of acquirer   $ 6,800    
Percentage of increase decrease in share price due to indirect investment in LSEG   10.00%    
Other finance income [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Foreign exchange gains 19      
Net foreign exchange gain   $ 11    
Refinitiv [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Percentage of ownership held     45.00%  
Total number of share issued - warrant exercise | shares   4.5    
Note Repayments Before Maturity [Member]        
Disclosure of detailed information about financial instruments [Line Items]        
Debt repaid     $ 640  
Credit Facility Covenant- Acquisitions [Member]        
Disclosure of detailed information about financial instruments [Line Items]        
Purchase price   $ 500    
At fair value [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Derivative financial assets   99 100  
Foreign Exchange Contracts [Member] | At fair value [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Notional amount     0  
Fair value of contracts outstanding $ 19      
Forward interest rate swaps - cash flow hedges [member] | Other finance income [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Fair Value Gain (Loss) Through Earnings     10  
Credit risk [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Cash and cash equivalents   $ 778 1,787  
Percentage of cash and cash equivalents at A- or above rated institutions   94.00%    
Derivative financial assets   $ 99 100  
Cross-currency interest rate swaps [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Derivative financial assets   $ 99 100  
Hedge ratio of swap to debt amounts   1:1    
Cross-currency interest rate swaps [member] | Net Interest Expense [Member]        
Disclosure of detailed information about financial instruments [Line Items]        
Foreign exchange gains   $ 9 97  
Commercial paper [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Commercial paper programs   1,800    
Commercial papers issued     630  
Commercial paper borrowings outstanding   $ 0 $ 0  
Notes, Debentures and Commercial Paper [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Weighted-average interest rate   4.10% 4.10%  
Credit Facilities [Member]        
Disclosure of detailed information about financial instruments [Line Items]        
Gross loan commitments   $ 1,800    
Amended Credit Facility Maturities In December 2024 [Member]        
Disclosure of detailed information about financial instruments [Line Items]        
Gross loan commitments   $ 1,800    
Maturity date   December 2024    
Credit facility, rate of interest added to reference rate   112.50%    
Additional commitment from lenders   $ 600    
Borrowings   0 $ 0  
Maximum CreditFacility Agreement   $ 2,400    
Proceeds from non-current borrowings     1,000  
Repayments of non-current borrowings     $ 1,000  
Ratio of net debt to ebitda under credit facility   1.5    
Top of range [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Percentage of ownership held   50.00%    
Top of range [member] | Amended Credit Facility Maturities In December 2024 [Member]        
Disclosure of detailed information about financial instruments [Line Items]        
Required ratio of net debt to ebitda   4.5    
Top of range [member] | Amended Credit Facility Maturities In December 2024 [Member] | Scenario Forecast one [Member]        
Disclosure of detailed information about financial instruments [Line Items]        
Required ratio of net debt to ebitda   5.0