Mortgage Banking Activities, Analysis of Changes in Fair Value MSRs (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Changes in fair value:
Net changes in valuation inputs or assumptions	$ 316	$ 868	$ 91	$ 2,473
Changes due to collection/realization of expected cash flows	(325)	(287)	(646)	(644)
Total changes in fair value	(9)	581	(555)	1,829
Commercial mortgage servicing [Member]
Mortgage Banking Activities Textual [Abstract]
Servicing asset, amortized cost	1,100	1,200	1,100	1,200
Servicing asset at amortized cost, estimated fair value	1,900	2,100	1,900	2,100
Residential mortgage servicing rights [Member]
Changes in MSRs measured at fair value
Fair value, beginning of period	8,819	8,511	9,310	6,920
Originations/purchases	47	322	95	664
Sales and other	(606)	(251)	(599)	(250)
Net additions	(559)	71	(504)	414
Changes in fair value:
Net changes in valuation inputs or assumptions	316	868	91	2,473
Changes due to collection/realization of expected cash flows	(325)	(287)	(646)	(644)
Total changes in fair value	(9)	581	(555)	1,829
Fair value, end of period	8,251	9,163	8,251	9,163
Residential mortgage servicing rights [Member] \| Interest-only strips [Member]
Changes in MSRs measured at fair value
Sales and other		244
Residential mortgage servicing rights [Member] \| Market interest rates [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	318	949	137	2,648
Residential mortgage servicing rights [Member] \| Servicing and foreclosure costs [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	1	(9)	2	(12)
Residential mortgage servicing rights [Member] \| Discount rates [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	0	31	(25)	86
Residential mortgage servicing rights [Member] \| Prepayment estimates and other [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	$ (3)	$ (103)	$ (23)	$ (249)

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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.

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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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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.

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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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