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Mortgage Servicing Rights - Summary of Income and Fees (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 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	$ (26)	$ (18)
Changes in fair value due to interest rate risk	34	(19)
Residential first mortgage loans
Servicing Assets at Fair Value [Line Items]
Servicing fees, ancillary income and late fees	58	56
Decrease in MSR fair value due to pay-offs, pay-downs, run-off, model changes and other	(26)	(18)
Changes in fair value due to interest rate risk	34	(19)
Gain on MSR derivatives	(44)	3
Net transaction costs	(1)	(1)
Total return (loss) included in net return on mortgage servicing rights	21	21
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	37	36
Charges on subserviced custodial balances	(36)	(29)
Other servicing charges	1	(1)
Total income (loss) on mortgage loans subserviced, included in loan administration income	2	$ 6
FDIC Serviced Loans | Loan administration income on mortgage loans subserviced
Servicing Assets at Fair Value [Line Items]
Servicing fees, ancillary income and late fees	$ 10

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- Definition

The total amount of other servicing charges earned on loans serviced and subserviced for others during the period for which results of operations are presented.

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The total amount of income earned on loans serviced and subserviced for others during the period for which results of operations are presented.

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The total amount of net transaction costs earned on loans serviced and subserviced for others during the period for which results of operations are presented.

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Subservicing Asset At Fair Value, Charges On Subserviced Escrow Balances

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The amount of income earned from subservicing an asset at fair value.

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Amount of contractually specified servicing fee, late fee, and ancillary fee recognized as income for servicing asset and servicing liability.

+ References

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Gain (loss) incurred in hedging activities.

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Amount of increase (decrease) from changes in fair value classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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The increase (decrease) in the fair value of servicing assets that are subsequently measured at fair value.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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