Mortgage Banking Activities, Assumptions and Sensitivity of Residential MSRs (Details) - Residential mortgage servicing rights [Member] $ in Millions	12 Months Ended
Dec. 31, 2025 USD ($) $ / loan	Dec. 31, 2024 USD ($) $ / loan	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
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]
Mortgage servicing rights, carried at fair value	$ 5,696	$ 6,844	$ 7,468	$ 9,310
Expected weighted-average life (in years)	6 years 3 months 18 days	6 years 4 months 24 days
Key assumptions [Abstract]
Prepayment rate assumption	8.00%	8.10%
Impact on fair value from 10% adverse change	$ (163)	$ (191)
Impact on fair value from 25% adverse change	$ (394)	$ (461)
Discount rate assumption	9.10%	10.10%
Impact on fair value from 100 basis point increase	$ (243)	$ (270)
Impact on fair value from 200 basis point increase	$ (465)	$ (519)
Cost to service assumption ($ per loan) \| $ / loan	96	103
Impact on fair value from 10% adverse change	$ (106)	$ (134)
Impact on fair value from 25% adverse change	$ (266)	$ (334)

Weighted average life of securitized assets regardless of when the transfer occurred, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 20
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Discount rate which is used to value residual cash flows generated by financial assets of a securitization, asset-backed financing arrangement, or similar transfer regardless of when the transfer occurred.

+ References

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Estimated rate of prepayment of principal on financial assets regardless of when the transfer occurred.

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The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

+ References

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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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The hypothetical financial impact of a specified adverse percentage change in prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Assumption For Fair Value Of Assets Or Liabilities That Relate To Transferor's Continuing Involvement, Key Economic Assumptions [Abstract]

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The cost to service assumption for securitized financial assets. This is used as a key input and assumption in measuring the fair value of assets or liabilities that relate to a transferor's continuing involvement, if any, as of the date of the latest statement of financial position presented.

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Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor, Servicing Assets Or Liabilities Impact Of Hundred Basis Point Adverse Change In Discount Rate.

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Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Impact Of Two Hundred Basis Point Adverse Change In Discount Rate.

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The hypothetical financial impact of a 10 percent adverse change of cost to service on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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The hypothetical financial impact of a specified adverse percentage change in cost to service on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

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