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MORTGAGE BANKING AND OTHER - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
MSRs
Fair value as of beginning of period			$ 658
Fair value at end of the period	$ 978		978
Residential mortgage
MSRs
Fair value as of beginning of period	902	$ 568	658	$ 642
Amounts capitalized	109	85	318	238
Changes in unpaid principal balance during the period	(54)	(55)	(159)	(141)
Changes in fair value during the period	21	8	161	(323)
Fair value at end of the period	978	606	978	606
Cumulative Effect, Period of Adoption, Adjustment | Residential mortgage
MSRs
Fair value as of beginning of period	0	0	0	190
Cumulative Effect, Period of Adoption, Adjusted Balance | Residential mortgage
MSRs
Fair value as of beginning of period	$ 902	$ 568	$ 658	$ 832

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-SubTopic 50
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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.

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