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Servicing of Financial Assets (Data And Assumptions Used In The Fair Value Calculation As Well As The Valuation's Sensitivity To Rate Fluctuations Related To Residential and Commercial Mortgage Servicing Rights) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) basis_point	Mar. 31, 2024 USD ($) basis_point
Residential Mortgage
Servicing Assets at Fair Value [Line Items]
Unpaid principal balance	$ 67,771	$ 69,708
Weighted-average CPR (%)	7.70%	8.20%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed	$ (36)	$ (46)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed	$ (70)	$ (89)
Option-adjusted spread (basis points) | basis_point	533	486
Estimated impact on fair value of a 10% increase	$ (23)	$ (22)
Estimated impact on fair value of a 20% increase	$ (47)	$ (44)
Weighted-Average Coupon Interest Rate	3.80%	3.70%
Weighted-average remaining maturity (months)	294 months	302 months
Weighted-average servicing fee (basis points) | basis_point	27.3	27.1
Commercial Real Estate
Servicing Assets at Fair Value [Line Items]
Unpaid principal balance	$ 7,544	$ 6,174
Weighted-average CPR (%)	7.10%	8.00%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed	$ (1)	$ (1)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed	$ (3)	$ (3)
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate	8.20%	7.10%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Other Assumption	$ (3)	$ (2)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Other Assumption	$ (5)	$ (4)
Weighted-Average Coupon Interest Rate	4.70%	4.50%
Weighted-average remaining maturity (months)	146 months	157 months
Weighted-average servicing fee (basis points) | basis_point	25.7	29.2

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Commercial mortgage servicing rights, weighted-average coupon interest rate

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Residential mortgage servicing rights, weighted-average coupon interest rate

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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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-Section 50
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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.

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

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Amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction that continue to be recognized in the statement of financial position. Includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

+ References

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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.

+ References

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The hypothetical financial impact of a 10 percent adverse change of the specified assumption 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 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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+ 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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