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MORTGAGE BANKING AND OTHER - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
MSRs
Fair value as of beginning of period	$ 642
Fair value at end of the period	658	$ 642
Residential mortgages
MSRs
Fair value as of beginning of period	642	600
Amounts capitalized	324	270
Changes in unpaid principal balance during the period	(196)	(119)
Changes in fair value during the period	(302)	(109)
Fair value at end of the period	658	642
Cumulative Effect, Period of Adoption, Adjustment | Residential mortgages
MSRs
Fair value as of beginning of period	190	0
Fair value at end of the period		190
Cumulative Effect, Period Of Adoption, Adjusted Balance | Residential mortgages
MSRs
Fair value as of beginning of period	$ 832	600
Fair value at end of the period		$ 832

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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
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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

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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.

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