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Settlement and Other Risk Management - Estimated Settlement Exposure (Details) - Guarantee Obligations - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Risks Inherent in Servicing Assets and Servicing Liabilities    
Gross settlement exposure $ 73,134 $ 64,885
Risk mitigation arrangements applied to settlement exposure 1 (11,141) (9,224)
Net settlement exposure 1 $ 61,993 $ 55,661