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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

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