Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562

Name:	us-gaap_OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

SECURITIES - Narrative (Details) - USD ($)	3 Months Ended			6 Months Ended
SECURITIES - Narrative (Details) - USD ($)	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items]
Residential Investment securities sold, carrying value	$ 3,300,000,000		$ 5,500,000,000	$ 6,200,000,000	$ 47,400,000,000
Commercial Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Impairment, available-for-sale debt security		$ 400,000	$ 0		$ 0