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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 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 113,407 | $ 110,617
High loan-to-value |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 780 | 796
High loan-to-value | Residential Mortgages |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 430 | 366
High loan-to-value | Home Equity Loans and Lines of Credit |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 145 | 166
High loan-to-value | Home Equity Products Serviced by Others |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 205 | 264
High loan-to-value | Credit Cards |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
High loan-to-value | Education |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Interest-only/negative amortization |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,770 | 1,764
Interest-only/negative amortization | Residential Mortgages |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,770 | 1,763
Interest-only/negative amortization | Home Equity Loans and Lines of Credit |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Interest-only/negative amortization | Home Equity Products Serviced by Others |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Interest-only/negative amortization | Credit Cards |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Interest-only/negative amortization | Education |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 1
Low introductory rate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 197 | 197
Low introductory rate | Residential Mortgages |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Low introductory rate | Home Equity Loans and Lines of Credit |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Low introductory rate | Home Equity Products Serviced by Others |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Low introductory rate | Credit Cards |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 197 | 197
Low introductory rate | Education |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Multiple characteristics and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1 | 1
Multiple characteristics and other | Residential Mortgages |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1 | 1
Multiple characteristics and other | Home Equity Loans and Lines of Credit |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Multiple characteristics and other | Home Equity Products Serviced by Others |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Multiple characteristics and other | Credit Cards |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Multiple characteristics and other | Education |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Credit risk, loans with increased credit exposure |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 2,748 | 2,758
Credit risk, loans with increased credit exposure | Residential Mortgages |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 2,201 | 2,130
Credit risk, loans with increased credit exposure | Home Equity Loans and Lines of Credit |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 145 | 166
Credit risk, loans with increased credit exposure | Home Equity Products Serviced by Others |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 205 | 264
Credit risk, loans with increased credit exposure | Credit Cards |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 197 | 197
Credit risk, loans with increased credit exposure | Education |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 0 | $ 1

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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
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