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Sales of Receivables and Servicing Rights - Activity Related to Mortgage Banking Net Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Transfers and Servicing [Abstract]        
Residential mortgage loan sales $ 1,379 $ 1,327 $ 3,554 $ 2,802
Origination fees and gains on loan sales 22 18 56 50
Gross mortgage servicing fees $ 73 $ 77 $ 219 $ 233