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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Notional and Recorded Fair Values) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 30,899 | $ 24,553
Other assets | 353 | 446
Other liabilities | 257 | 350
Net credit valuation adjustment reducing fair value |  | 9
Other assets |  |
Derivative [Line Items] |  |
Other assets | 353 | 446
Other liabilities |  |
Derivative [Line Items] |  |
Other liabilities | 257 | 350
Derivatives designated as accounting hedges: |  |
Derivative [Line Items] |  |
Notional amount | 9,729 | 6,218
Derivatives designated as accounting hedges: | Other assets |  |
Derivative [Line Items] |  |
Other assets | 84 | 93
Derivatives designated as accounting hedges: | Other liabilities |  |
Derivative [Line Items] |  |
Other liabilities | 0 | 2
Derivatives designated as accounting hedges: | Hedges of floating-rate assets | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Notional amount | 1,250 | 550
Derivatives designated as accounting hedges: | Hedges of floating-rate assets | Other assets | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Other assets | 7 | 0
Derivatives designated as accounting hedges: | Hedges of floating-rate assets | Other liabilities | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Other liabilities | 0 | 2
Derivatives designated as accounting hedges: | Hedges of floating-rate liabilities | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Notional amount | 0 | 500
Derivatives designated as accounting hedges: | Hedges of floating-rate liabilities | Other assets | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Other assets | 0 | 0
Derivatives designated as accounting hedges: | Hedges of floating-rate liabilities | Other liabilities | Cash Flow Hedging |  |
Derivative [Line Items] |  |
Other liabilities | 0 | 0
Derivatives designated as accounting hedges: | Hedges of fixed-rate assets | Fair Value Hedging |  |
Derivative [Line Items] |  |
Notional amount | 7,479 | 4,668
Derivatives designated as accounting hedges: | Hedges of fixed-rate assets | Other assets | Fair Value Hedging |  |
Derivative [Line Items] |  |
Other assets | 77 | 93
Derivatives designated as accounting hedges: | Hedges of fixed-rate assets | Other liabilities | Fair Value Hedging |  |
Derivative [Line Items] |  |
Other liabilities | 0 | 0
Derivatives designated as accounting hedges: | Hedges of fixed-rate liabilities | Fair Value Hedging |  |
Derivative [Line Items] |  |
Notional amount | 1,000 | 500
Derivatives designated as accounting hedges: | Hedges of fixed-rate liabilities | Other assets | Fair Value Hedging |  |
Derivative [Line Items] |  |
Other assets | 0 | 0
Derivatives designated as accounting hedges: | Hedges of fixed-rate liabilities | Other liabilities | Fair Value Hedging |  |
Derivative [Line Items] |  |
Other liabilities | 0 | 0
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional amount | 21,170 | 18,335
Derivatives not designated as hedging instruments | Other assets |  |
Derivative [Line Items] |  |
Other assets | 269 | 353
Derivatives not designated as hedging instruments | Other liabilities |  |
Derivative [Line Items] |  |
Other liabilities | 257 | 348
Derivatives not designated as hedging instruments | Customer-facing interest rate derivatives |  |
Derivative [Line Items] |  |
Notional amount | 19,067 | 16,833
Derivatives not designated as hedging instruments | Customer-facing interest rate derivatives | Other assets |  |
Derivative [Line Items] |  |
Other assets | 263 | 348
Derivatives not designated as hedging instruments | Customer-facing interest rate derivatives | Other liabilities |  |
Derivative [Line Items] |  |
Other liabilities | 255 | 346
Derivatives not designated as hedging instruments | Customer commodity derivatives |  |
Derivative [Line Items] |  |
Notional amount | 205 | 0
Derivatives not designated as hedging instruments | Customer commodity derivatives | Other assets |  |
Derivative [Line Items] |  |
Other assets | 1 | 0
Derivatives not designated as hedging instruments | Customer commodity derivatives | Other liabilities |  |
Derivative [Line Items] |  |
Other liabilities | 1 | 0
Derivatives not designated as hedging instruments | Other interest rate derivatives |  |
Derivative [Line Items] |  |
Notional amount | 1,259 | 1,105
Derivatives not designated as hedging instruments | Other interest rate derivatives | Other assets |  |
Derivative [Line Items] |  |
Other assets | 2 | 1
Derivatives not designated as hedging instruments | Other interest rate derivatives | Other liabilities |  |
Derivative [Line Items] |  |
Other liabilities | 0 | 0
Derivatives not designated as hedging instruments | Foreign exchange derivatives |  |
Derivative [Line Items] |  |
Notional amount | 579 | 373
Derivatives not designated as hedging instruments | Foreign exchange derivatives | Other assets |  |
Derivative [Line Items] |  |
Other assets | 3 | 4
Derivatives not designated as hedging instruments | Foreign exchange derivatives | Other liabilities |  |
Derivative [Line Items] |  |
Other liabilities | 1 | 2
Derivatives not designated as hedging instruments | Purchased credit derivatives |  |
Derivative [Line Items] |  |
Notional amount | 60 | 24
Derivatives not designated as hedging instruments | Purchased credit derivatives | Other assets |  |
Derivative [Line Items] |  |
Other assets | 0 | 0
Derivatives not designated as hedging instruments | Purchased credit derivatives | Other liabilities |  |
Derivative [Line Items] |  |
Other liabilities | $ 0 | $ 0

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