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MORTGAGE BANKING - Changes Related to MSRs - Fair Value Method (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
MSRs
Fair value as of beginning of period			$ 600
Fair value at end of the period	$ 510		510
Residential mortgages
MSRs
Fair value as of beginning of period	531	$ 0	600	$ 0
Acquired MSRs	0	590	0	590
Amounts capitalized	78	29	170	29
Changes in unpaid principal balance during the period	(31)	(12)	(88)	(12)
Changes in fair value during the period	(68)	5	(172)	5
Fair value at end of the period	$ 510	$ 612	$ 510	$ 612

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- Definition

Servicing Asset At Fair Value, Amount Capitalized

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

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-Publisher FASB
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-Topic 860
-SubTopic 50
-Section 50
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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

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-Publisher FASB
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-Topic 860
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

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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