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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Troubled Debt Restructurings, Modified Default (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | $ 164 | $ 242
Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 1 |
Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 112 |
Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 44 |
Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 7 |
Commercial |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 145 |
Commercial | Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Commercial | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 102 |
Commercial | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 43 |
Commercial | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Commercial | Commercial and industrial |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 43 | 0
Commercial | Commercial and industrial | Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Commercial | Commercial and industrial | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Commercial | Commercial and industrial | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 43 |
Commercial | Commercial and industrial | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Commercial | Commercial real estate |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 102 |
Commercial | Commercial real estate | Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Commercial | Commercial real estate | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 102 |
Commercial | Commercial real estate | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Commercial | Commercial real estate | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 19 |
Retail | Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 1 |
Retail | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 10 |
Retail | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 1 |
Retail | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 7 |
Retail | Residential mortgages |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 15 | $ 242
Retail | Residential mortgages | Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 1 |
Retail | Residential mortgages | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 9 |
Retail | Residential mortgages | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Residential mortgages | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 5 |
Retail | Home equity |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 3 |
Retail | Home equity | Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Home equity | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 1 |
Retail | Home equity | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Home equity | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 2 |
Retail | Automobile |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Automobile | Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Automobile | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Automobile | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Automobile | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Education |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 1 |
Retail | Education | Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Education | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Education | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 1 |
Retail | Education | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Other retail |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Other retail | Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Other retail | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Other retail | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 |
Retail | Other retail | Interest Rate Reduction and Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | $ 0 |

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