Mortgage Banking Activities, Analysis of Changes in Fair Value MSRs (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Changes in MSRs measured at fair value
Fair value, beginning of year	$ 6,125
Changes in fair value:
Net changes in valuation inputs or assumptions	(1,591)	$ 3,257
Changes due to collection/realization of expected cash flows	585	564
Total changes in fair value	1,006	(3,821)
Fair value, end of period	7,536
Commercial mortgage servicing [Member]
Mortgage Banking Activities Textual [Abstract]
Mortgage servicing rights	1,300	1,400
Servicing asset at amortized cost, fair value	1,700	1,500
Residential mortgage servicing rights [Member]
Changes in MSRs measured at fair value
Fair value, beginning of year	6,125	11,517
Servicing from securitizations or asset transfers	406	461
Sales and other	(1)	(31)
Net additions	405	430
Changes in fair value:
Net changes in valuation inputs or assumptions	1,591	(3,257)
Changes due to collection/realization of expected cash flows	(585)	(564)
Total changes in fair value	1,006	(3,821)
Fair value, end of period	7,536	8,126
Residential mortgage servicing rights [Member] \| Mortgage interest rates [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	1,630	(3,022)
Residential mortgage servicing rights [Member] \| Servicing and foreclosure costs [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	9	(73)
Residential mortgage servicing rights [Member] \| Discount rates [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	47	27
Residential mortgage servicing rights [Member] \| Prepayment estimates and other [Member]
Changes in fair value:
Net changes in valuation inputs or assumptions	$ (95)	$ (189)

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

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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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