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MORTGAGE BANKING AND OTHER - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
MSRs
Fair value as of beginning of period	$ 658
Fair value at end of the period	893
Residential mortgages
MSRs
Fair value as of beginning of period	658	$ 642
Amounts capitalized	87	67
Changes in unpaid principal balance during the period	(58)	(40)
Changes in fair value during the period	206	(282)
Fair value at end of the period	893	577
Cumulative Effect, Period Of Adoption, Adjustment | Residential mortgages
MSRs
Fair value as of beginning of period	0	190
Cumulative Effect, Period Of Adoption, Adjusted Balance | Residential mortgages
MSRs
Fair value as of beginning of period	$ 658	$ 832

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- Definition

Servicing Asset At Fair Value, Amount Capitalized

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- Definition

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
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
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-Paragraph 3
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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.

+ References

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