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Assets Held for Sale and Associated Liabilities - Summary of Income and Fees (Details) - Discontinued Operations, Held-for-Sale - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Servicing Assets at Fair Value [Line Items]        
Servicing fees, ancillary income and late fees $ 60 $ 59 $ 176 $ 169
Decrease in MSR fair value due to pay-offs, pay-downs, run-off, model changes and other (31) (20) (91) (54)
Changes in fair value due to interest rate risk (44) 57 (4) 59
Gain on MSR derivatives 48 (73) (7) (105)
Net transaction costs 1 0 0 1
Total return (loss) included in net return on mortgage servicing rights 34 23 74 70
Loan administration income on mortgage loans subserviced        
Servicing Assets at Fair Value [Line Items]        
Servicing fees, ancillary income and late fees 34 42 104 116
Charges on subserviced custodial balances (47) (55) (125) (124)
Other servicing charges 0 (1) 2 (3)
Total income (loss) on mortgage loans subserviced, included in loan administration income $ (13) $ (14) $ (19) $ (11)