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Goodwill Mortgage Servicing Rights (Commercial and Residential Mortgage Servicing Rights - Key Valuation Assumptions) (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
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]
Fair value	$ 3,627	$ 3,711
Mortgage Servicing Rights | Commercial real estate
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	$ 1,005	$ 1,085	$ 975	$ 1,032
Weighted-average life (years)	3 years 9 months 18 days	3 years 9 months 18 days
Decline in fair value from 10% adverse change in prepayment rate	$ 8	$ 8
Decline in fair value from 20% adverse change in prepayment rate	16	16
Decline in fair value from 10% adverse change in interest rate	31	35
Decline in fair value from 20% adverse change in interest rate	61	69
Mortgage Servicing Rights | Residential mortgage loans held for sale
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	$ 2,622	$ 2,626	$ 2,528	$ 2,654
Weighted-average life (years)	7 years 8 months 12 days	8 years
Decline in fair value from 10% adverse change in prepayment rate	$ 64	$ 57
Decline in fair value from 20% adverse change in prepayment rate	$ 123	$ 111
Weighted-average option adjusted spread	7.40%	7.55%
Decline in fair value from 10% adverse change in adjusted spread	$ 81	$ 81
Decline in fair value from 20% adverse change in adjusted spread	$ 158	$ 157
Mortgage Servicing Rights | Constant prepayment rate | Commercial real estate
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]
Servicing asset, measurement input	0.0444	0.0445
Mortgage Servicing Rights | Constant prepayment rate | Residential mortgage loans held for sale
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]
Servicing asset, measurement input	0.0682	0.0639
Mortgage Servicing Rights | Discount rate | Commercial real estate
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]
Servicing asset, measurement input	0.1061	0.1118

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The assumed yield spread over the benchmark curve for each instrument is generally intended to incorporate non-interest-rate risks such as credit and liquidity risks as an input to measure fair value.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
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The hypothetical financial impact of a 10 percent adverse change of the discount rate 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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