Mortgage Banking Activities, Analysis of Changes in Fair Value MSRs (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Changes in fair value:
Net changes in valuation inputs or assumptions	$ 750	$ 275	$ 3,223	$ 1,057
Changes due to collection/realization of expected cash flows	(290)	(507)	(934)	(1,580)
Total changes in fair value	460	(232)	2,289	(523)
Commercial mortgage servicing [Member]
Mortgage Banking Activities Textual [Abstract]
Mortgage servicing rights	1,200	1,300	1,200	1,300
Servicing asset at amortized cost, fair value	2,300	1,500	2,300	1,500
Residential mortgage servicing rights [Member]
Changes in MSRs measured at fair value
Fair value, beginning of period	9,163	6,717	6,920	6,125
Servicing from securitizations or asset transfers	204	379	868	1,270
Sales and other	1	(2)	(249)	(10)
Net additions	205	377	619	1,260
Changes in fair value:
Net changes in valuation inputs or assumptions	750	275	3,223	1,057
Changes due to collection/realization of expected cash flows	(290)	(507)	(934)	(1,580)
Total changes in fair value	460	(232)	2,289	(523)
Fair value, end of period	9,828	6,862	9,828	6,862
Residential mortgage servicing rights [Member] \| Mortgage interest rates [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	760	320	3,408	1,421
Residential mortgage servicing rights [Member] \| Servicing and foreclosure costs [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	(8)	2	(20)	11
Residential mortgage servicing rights [Member] \| Discount rates [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	(44)	(263)	42	(56)
Residential mortgage servicing rights [Member] \| Prepayment estimates and other [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	$ 42	$ 216	(207)	$ (319)
Interest-only strips [Member] \| Residential mortgage servicing rights [Member]
Changes in MSRs measured at fair value
Sales and other			$ 244

Amortized amount 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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-Name Accounting Standards Codification
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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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The value of new servicing assets, subsequently measured at fair value, created during the current period through securitizations or transfers of financial assets.

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