Mortgage Servicing Rights - Sensitivity to Changes in Interest Rates of the Fair Value of MSR Portfolio and Related Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
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	$ 398	$ 325
Fair value 50 basis points change	187	147
Fair value 25 basis points change	89	69
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	33	15
Fair value 50 basis points change	14	3
Fair value 25 basis points change	5	0
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	(365)	(310)
Fair value 50 basis points change	(173)	(144)
Fair value 25 basis points change	(84)	(69)
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	(285)	(220)
Fair value 50 basis points change	(151)	(118)
Fair value 25 basis points change	(79)	(61)
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	(10)	(3)
Fair value 50 basis points change	(1)	2
Fair value 25 basis points change	(1)	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	275	217
Fair value 50 basis points change	150	120
Fair value 25 basis points change	$ 78	$ 63

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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