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Mortgage Servicing Rights - Summary of Income and Fees (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Fair Value, Other Changes in Fair Value	$ (80)
Changes in fair value due to interest rate risk	1
Net return on mortgage servicing rights	103	$ 6	$ 0
Total (loss) income on mortgage loans subserviced, included in loan administration income	(17)	3
Residential first mortgage loans
Servicing Assets at Fair Value [Line Items]
Servicing fees, ancillary income and late fees	227	20
Servicing Asset at Fair Value, Other Changes in Fair Value	(80)	(8)
Changes in fair value due to interest rate risk	1	10
Gain on MSR derivatives	(47)	(16)
Net transaction costs	2	0
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	154	11
Charges on subserviced custodial balances	(168)	(8)
Other servicing charges	(3)	$ 0
FDIC Serviced Loans | Loan administration income on mortgage loans subserviced
Servicing Assets at Fair Value [Line Items]
Servicing fees, ancillary income and late fees	$ 95

X

- 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.

+ References

No definition available.

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- Definition

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.

+ References

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Subservicing Asset At Fair Value, Charges On Subserviced Escrow Balances

+ References

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

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481229/860-50-50-2

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- Definition

Gain (loss) incurred in hedging activities.

+ References

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The adjustment to the carrying value of the rights retained or purchased to service mortgages. These adjustments are made when the estimate of the fair value is changed. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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