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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Loans with Indicators of High Credit Risk (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
High loan-to-value
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 353	$ 553
High loan-to-value | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total	289	402
High loan-to-value | Home Equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total	64	151
High loan-to-value | Other Retail
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Interest-only/negative amortization
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,801	2,043
Interest-only/negative amortization | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,801	2,043
Interest-only/negative amortization | Home Equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Interest-only/negative amortization | Other Retail
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Low introductory rate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	170	235
Low introductory rate | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Low introductory rate | Home Equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Low introductory rate | Other Retail
Financing Receivable, Credit Quality Indicator [Line Items]
Total	170	235
Credit risk, loans with increased credit exposure
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3,324	2,831
Credit risk, loans with increased credit exposure | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total	3,090	2,445
Credit risk, loans with increased credit exposure | Home Equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total	64	151
Credit risk, loans with increased credit exposure | Other Retail
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 170	$ 235

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No definition available.

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- Definition

Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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