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Non-consolidated variable interest entities - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
NumberOfVIE
Dec. 31, 2023
USD ($)
Variable Interest Entity [Line Items]    
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement $ 44 $ 50
Variable Interest Entity Not Primary Beneficiary [Member]    
Variable Interest Entity [Line Items]    
Number of VIEs | NumberOfVIE 3  
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement $ 6,600 $ 7,200