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Measurement of financial assets and liabilities - Derecognition and collateral (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Securities lending and reverse repurchase agreements    
Collateral held in respect of reverse repurchase agreements $ 2,871 $ 3,623
Lent securities and assets subject to repurchase 1,565 2,001
Cash and securities collateral held or pledged under repurchase and securities lending agreements 1,686 2,042
Credit risk, over-the-counter derivative transactions    
Collateral and pledges    
Amount of assets pledged as collateral for liabilities 1,527 457
Amount of collateral held $ 280 $ 1,586