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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, 2024 | Dec. 31, 2023
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | $ 223 | $ 164
Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 6 | 1
Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 179 | 112
Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 34 | 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 | 4 | 7
Commercial |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 173 | 145
Commercial | Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 1 | 0
Commercial | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 152 | 102
Commercial | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 20 | 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 | 0
Commercial | Commercial and industrial |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 19 | 43
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 | 1 | 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 | 18 | 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 | 0 | 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 | 0
Commercial | Commercial real estate |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 154 | 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 | 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 | 134 | 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 | 20 | 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 | 0
Retail |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 50 | 19
Retail | Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 5 | 1
Retail | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 27 | 10
Retail | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 14 | 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 | 4 | 7
Retail | Residential mortgages |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 32 | 15
Retail | Residential mortgages | Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 1
Retail | Residential mortgages | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 26 | 9
Retail | Residential mortgages | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 3 | 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 | 3 | 5
Retail | Home equity |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 2 | 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 | 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 | 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 | 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 | 1 | 2
Retail | Automobile |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 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 | 0
Retail | Automobile | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 0
Retail | Automobile | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 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 | 0
Retail | Education |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 15 | 1
Retail | Education | Interest Rate Reduction |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 4 | 0
Retail | Education | Term Extension |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 0
Retail | Education | Payment Delay |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 11 | 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 | 0
Retail | Other retail |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |
Amortized cost basis of modified loans that are in subsequent default | 1 | 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 | 1 | 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 | 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 | 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 | $ 0

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