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Sales of Receivables and Servicing Rights - Activity Related to Mortgage Banking Net Revenue (Details) - Residential mortgage loans - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption        
Residential mortgage loan sales $ 1,632 $ 1,171 $ 2,913 $ 2,174
Origination fees and gains on residential mortgage loan sales 21 19 44 34
Contractually Specified Servicing Fees, Amount $ 71 $ 73 $ 141 $ 147