Mortgage Banking Activities, Mortgage Servicing Rights (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Servicing Asset [Abstract]
Total MSRs	$ 6,218	$ 7,180	$ 6,327
Commercial mortgage servicing [Member]
Servicing Asset [Abstract]
Commercial MSRs at amortized cost, end of period	610	644
Mortgage Banking Activities Textual [Abstract]
Servicing asset at amortized cost, estimated fair value	765	780
Residential mortgage servicing rights [Member]
Changes in MSRs measured at fair value
Residential MSRs at fair value, beginning of period	5,696	6,844
Originations/purchases	17	25
Sales and other	1	(76)
Net additions (reductions)	18	(51)
Changes in fair value:
Net changes in valuation inputs or assumptions	56	(68)
Changes due to collection/realization of expected cash flows	(162)	(189)
Total changes in fair value	(106)	(257)
Residential MSRs at fair value, end of period	5,608	6,536
Residential mortgage servicing rights [Member] \| Market interest rates [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	28	(123)
Residential mortgage servicing rights [Member] \| Servicing and foreclosure costs [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	(3)	5
Residential mortgage servicing rights [Member] \| Prepayment estimates and other [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	$ 31	$ 50

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

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Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

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Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

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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.

+ References

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Amount of increase (decrease) in fair value from changes in the inputs, assumptions, or model used to calculate the fair value of the contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of increase (decrease) from changes in fair value classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

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Amount of increase (decrease) in fair value from changes classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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The increase (decrease) in the fair value of servicing assets that are subsequently measured at fair value.

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Mortgage Banking Activities Textual Abstract.

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The net additions (reductions) in the fair value of servicing assets from the origination of mortgage servicing rights (MSRs) or disposals of servicing assets at fair value.

+ References

No definition available.

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