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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Troubled Debt Restructurings, Modified Default (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | $ 58 | $ 128 | $ 160 | $ 224
Interest Rate Reduction |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 3 | 3 | 4 | 6
Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 48 | 89 | 140 | 166
Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 4 | 21 | 8 | 34
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 |  | 7 | 2
Term Extension and Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 15 | 1 | 16
Commercial |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 40 | 115 | 122 | 181
Commercial | Interest Rate Reduction |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 1 | 0 | 1
Commercial | Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 40 | 78 | 120 | 144
Commercial | Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 21 | 2 | 21
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 | 0
Commercial | Term Extension and Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 15 | 0 | 15
Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 36 | 19 | 48 | 19
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 | 1 | 0 | 1
Commercial | Commercial and industrial | Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 36 | 3 | 48 | 3
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 | 0 | 0 | 0
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 | 0
Commercial | Commercial and industrial | Term Extension and Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 15 | 0 | 15
Commercial | Commercial real estate |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 4 | 96 | 74 | 162
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 | 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 | 4 | 75 | 72 | 141
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 | 21 | 2 | 21
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 | 0
Commercial | Commercial real estate | Term Extension and Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 0 | 0 | 0
Retail |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 18 | 13 | 38 | 43
Retail | Interest Rate Reduction |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 3 | 2 | 4 | 5
Retail | Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 8 | 11 | 20 | 22
Retail | Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 4 | 0 | 6 | 13
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 | 3 |  | 7 | 2
Retail | Term Extension and Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 0 | 1 | 1
Retail | Residential mortgages |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 16 | 11 | 33 | 25
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 | 0 | 1 | 0
Retail | Residential mortgages | Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 8 | 11 | 20 | 22
Retail | Residential mortgages | Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 4 | 0 | 5 | 1
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 |  | 6 | 1
Retail | Residential mortgages | Term Extension and Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 0 | 1 | 1
Retail | Home equity |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 0 | 3 | 1
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 | 1 | 0
Retail | Home equity | Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 0 | 0 | 0
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 | 1 | 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 | 0 |  | 1 | 1
Retail | Home equity | Term Extension and Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 0 | 0 | 0
Retail | Education |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 1 | 1 | 1 | 16
Retail | Education | Interest Rate Reduction |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 1 | 1 | 1 | 4
Retail | Education | Term Extension |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 0 | 0 | 0
Retail | Education | Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 0 | 0 | 12
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 | 0
Retail | Education | Term Extension and Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 0 | 0 | 0 | 0
Retail | Other retail |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | 1 | 1 | 1 | 1
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 | 1 | 1 | 1
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 | 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 | 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 | 0
Retail | Other retail | Term Extension and Payment Delay |  |  |  |
Financing Receivable, Modified, Subsequent Default [Line Items] |  |  |  |
Amortized cost basis of modified loans that are in subsequent default | $ 0 | $ 0 | $ 0 | $ 0

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