v3.25.2
Investments in securities - Schedule of Investments in Securities Using Predominantly Unobservable Inputs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Investments In Securities [Line Items]    
Investments in securities, at beginning of period $ 443,024  
Investments in securities, at end of period 406,270 $ 443,024
Measured using predominantly unobservable inputs | Debt and equity securities    
Disclosure Of Investments In Securities [Line Items]    
Investments in securities, at beginning of period 1,299 1,707
Losses recognised in other comprehensive income (126) (206)
Purchases 146 142
Sales (207) (37)
Other movements 31 (307)
Investments in securities, at end of period $ 1,143 $ 1,299