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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