Mortgage Servicing Rights - Sensitivity to Changes in Interest Rates of the Fair Value of MSR Portfolio and Related Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Down \| Derivative instrument hedges
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value 100 basis points change	$ 325	$ 381
Fair value 50 basis points change	147	178
Fair value 25 basis points change	69	86
Down \| Net sensitivity
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value 100 basis points change	15	11
Fair value 50 basis points change	3	5
Fair value 25 basis points change	0	2
Down \| MSR portfolio
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value 100 basis points change	(310)	(370)
Fair value 50 basis points change	(144)	(173)
Fair value 25 basis points change	(69)	(84)
Up \| Derivative instrument hedges
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value 100 basis points change	(220)	(289)
Fair value 50 basis points change	(118)	(152)
Fair value 25 basis points change	(61)	(79)
Up \| Net sensitivity
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value 100 basis points change	(3)	(21)
Fair value 50 basis points change	2	(5)
Fair value 25 basis points change	2	(2)
Up \| MSR portfolio
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Fair value 100 basis points change	217	268
Fair value 50 basis points change	120	147
Fair value 25 basis points change	$ 63	$ 77

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481326/860-20-50-4

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