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Non-consolidated variable interest entities - Additional Information (Details) - Variable Interest Entity Not Primary Beneficiary [Member]
$ in Billions
9 Months Ended
Sep. 30, 2025
USD ($)
NumberOfVIE
Dec. 31, 2024
USD ($)
Variable Interest Entity [Line Items]    
Number of VIEs | NumberOfVIE 2  
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement | $ $ 6.1 $ 6.6