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Mortgage Servicing Rights - Summary of Income and Fees (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Servicing Assets at Fair Value [Line Items]        
Decrease in MSR fair value due to pay-offs, pay-downs, run-off, model changes and other $ (34) $ (16) $ (60) $ (34)
Changes in fair value due to interest rate risk 6 21 40 2
Residential first mortgage loans        
Servicing Assets at Fair Value [Line Items]        
Servicing fees, ancillary income and late fees 58 54 116 110
Decrease in MSR fair value due to pay-offs, pay-downs, run-off, model changes and other (34) (16) (60) (34)
Changes in fair value due to interest rate risk 6 21 40 2
Gain on MSR derivatives (11) (35) (55) (32)
Net transaction costs 0 2 (1) 1
Total return (loss) included in net return on mortgage servicing rights 19 26 40 47
Residential first mortgage loans | Loan administration income on mortgage loans subserviced        
Servicing Assets at Fair Value [Line Items]        
Servicing fees, ancillary income and late fees 33 38 70 74
Charges on subserviced custodial balances (42) (40) (78) (69)
Other servicing charges 1 (1) 2 (2)
Total income (loss) on mortgage loans subserviced, included in loan administration income $ (8) $ (3) $ (6) $ 3