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Variable interest entities - Non-consolidated VIEs (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Variable Interest Entity [Line Items]    
Other assets $ 455,312 $ 416,064
Other liabilities 410,951 374,300
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Other assets 3,009 2,905
Other liabilities 897 951
Maximum loss exposure $ 3,906 $ 3,856