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Condensed financial information of the parent company - Additional information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
debenture
Dec. 31, 2022
USD ($)
debenture
Condensed Financial Statements, Captions [Line Items]    
Issue of contingent convertible capital securities $ 864 $ 750
Parent company    
Condensed Financial Statements, Captions [Line Items]    
Number of debentures held | debenture 0 0
Perpetual additional tier 1 contingent capital securities    
Condensed Financial Statements, Captions [Line Items]    
Issued capital $ 7,750 $ 6,750