Financial Instruments - Currency Risk- Sensitivity Analysis (Detail) - Ten percentage weakening in foreign currency vs us [member]
$ in Millions
Dec. 31, 2021
USD ($)
Summary of Hypothetical Change In Foreign Currency Exchange Rates On Earnings [line items]  
Financial assets and liabilities $ 8
Receivables under indemnification arrangement (23)
Non-permanent intercompany loans 150
Indirect investment in LSEG shares (680)
Foreign exchange contracts 352
Total impact on earnings (193)
British Pounds Sterling [Member]  
Summary of Hypothetical Change In Foreign Currency Exchange Rates On Earnings [line items]  
Financial assets and liabilities 1
Receivables under indemnification arrangement (23)
Non-permanent intercompany loans 60
Indirect investment in LSEG shares (680)
Foreign exchange contracts 352
Total impact on earnings (290)
Euros [member]  
Summary of Hypothetical Change In Foreign Currency Exchange Rates On Earnings [line items]  
Financial assets and liabilities (1)
Non-permanent intercompany loans 16
Total impact on earnings 15
Other Currencies [member]  
Summary of Hypothetical Change In Foreign Currency Exchange Rates On Earnings [line items]  
Financial assets and liabilities 7
Non-permanent intercompany loans 13
Total impact on earnings 20
Canada, Dollars [member]  
Summary of Hypothetical Change In Foreign Currency Exchange Rates On Earnings [line items]  
Financial assets and liabilities 1
Non-permanent intercompany loans 61
Total impact on earnings $ 62