Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Asset and Liability Management (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Notional Disclosures [Abstract]      
Notional Value $ 41,692   $ 38,192
Increase (decrease) to net interest income due to derivative adjustment (68) $ (52)  
Accrued Expenses And Other Liabilities [Member] | Credit contracts      
Notional Disclosures [Abstract]      
Derivative instruments not designated as hedging instruments, liability 0   2
Not Designated as Hedging Instrument, Economic Hedge      
Notional Disclosures [Abstract]      
Notional Value 175   175
Derivatives not designated as Hedging Instruments | Accrued income and other assets      
Notional Disclosures [Abstract]      
Notional Value 90,476   86,843
Derivatives not designated as Hedging Instruments | Accrued income and other assets | Credit contracts      
Notional Disclosures [Abstract]      
Notional Value 346   381
Fair Value Hedging | Derivatives designated as Hedging Instruments      
Notional Disclosures [Abstract]      
Notional Value 24,217   21,342
Cash Flow Hedges | Derivatives designated as Hedging Instruments      
Notional Disclosures [Abstract]      
Notional Value 17,300   16,675
Investment securities      
Notional Disclosures [Abstract]      
Notional Value 11,649   11,649
Investment securities | Not Designated as Hedging Instrument, Economic Hedge      
Notional Disclosures [Abstract]      
Notional Value 0   0
Investment securities | Fair Value Hedging | Derivatives designated as Hedging Instruments      
Notional Disclosures [Abstract]      
Notional Value 11,649   11,649
Investment securities | Cash Flow Hedges | Derivatives designated as Hedging Instruments      
Notional Disclosures [Abstract]      
Notional Value 0   0
Loans      
Notional Disclosures [Abstract]      
Notional Value 17,475   16,850
Loans | Not Designated as Hedging Instrument, Economic Hedge      
Notional Disclosures [Abstract]      
Notional Value 175   175
Loans | Fair Value Hedging | Derivatives designated as Hedging Instruments      
Notional Disclosures [Abstract]      
Notional Value 0   0
Loans | Cash Flow Hedges | Derivatives designated as Hedging Instruments      
Notional Disclosures [Abstract]      
Notional Value 17,300   16,675
Long-term debt      
Notional Disclosures [Abstract]      
Notional Value 12,568   9,693
Long-term debt | Not Designated as Hedging Instrument, Economic Hedge      
Notional Disclosures [Abstract]      
Notional Value 0   0
Long-term debt | Fair Value Hedging | Derivatives designated as Hedging Instruments      
Notional Disclosures [Abstract]      
Notional Value 12,568   9,693
Long-term debt | Cash Flow Hedges | Derivatives designated as Hedging Instruments      
Notional Disclosures [Abstract]      
Notional Value $ 0   $ 0