Mortgage Servicing Rights - Sensitivity to Changes in Interest Rates of the Fair Value of MSR Portfolio and Related Derivative Instruments (Details) - USD ($) $ in Millions	Jun. 30, 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	$ 304	$ 381
Fair value 50 basis points change	144	178
Fair value 25 basis points change	70	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	(8)	11
Fair value 50 basis points change	(1)	5
Fair value 25 basis points change	1	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	(312)	(370)
Fair value 50 basis points change	(145)	(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	(240)	(289)
Fair value 50 basis points change	(127)	(152)
Fair value 25 basis points change	(65)	(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	(20)	(21)
Fair value 50 basis points change	(6)	(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	220	268
Fair value 50 basis points change	121	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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