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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 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 114,720 | $ 110,617
High loan-to-value |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 620 | 796
High loan-to-value | Residential Mortgages |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 339 | 366
High loan-to-value | Home Equity Loans and Lines of Credit |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 107 | 166
High loan-to-value | Home Equity Products Serviced by Others |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 174 | 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
Interest-only/negative amortization |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,786 | 1,764
Interest-only/negative amortization | Residential Mortgages |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,786 | 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 |  | 1
Low introductory rate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 211 | 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 | 211 | 197
Low introductory rate | Education |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total |  | 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
Credit risk, loans with increased credit exposure |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 2,618 | 2,758
Credit risk, loans with increased credit exposure | Residential Mortgages |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 2,126 | 2,130
Credit risk, loans with increased credit exposure | Home Equity Loans and Lines of Credit |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 107 | 166
Credit risk, loans with increased credit exposure | Home Equity Products Serviced by Others |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 174 | 264
Credit risk, loans with increased credit exposure | Credit Cards |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 211 | 197
Credit risk, loans with increased credit exposure | Education |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total |  | $ 1

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