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Deferred tax assets and liabilities - Additional information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Taxes [Abstract]      
Unremitted earnings retained for reinvestment $ 9,000,000,000 $ 9,000,000,000  
Temporary differences and unused tax losses for which no deferred tax assets were recognized 8,900,000,000 8,900,000,000  
Capital loss carryforwards for which no deferred tax assets were recognized, expiring in three years 131,000,000 120,000,000  
Tax loss carryforwards expired in period $ 0 $ 0 $ 0