v3.26.1
DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Derivative Instruments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Asset Fair Value      
Asset Fair Value $ 498   $ 534
Less: gross amount offset in the Consolidated Balance Sheets 0   0
Derivative assets 498   534
Liability Fair Value      
Liability Fair Value (448)   (494)
Less: gross amount offset in the Consolidated Balance Sheets 0   0
Derivative liability $ (448)   (494)
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag [Extensible Enumeration] Net amount included in other assets and other liabilities in the Consolidated Balance Sheets Net amount included in other assets and other liabilities in the Consolidated Balance Sheets  
Qualifying Hedges      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional Amount $ 7,350   4,000
Asset Fair Value      
Asset Fair Value 0   0
Liability Fair Value      
Liability Fair Value 0   0
Qualifying Hedges | Interest rate contracts | Fair Value Hedges | Long-term borrowings      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional Amount 2,350   0
Asset Fair Value      
Asset Fair Value 0   0
Liability Fair Value      
Liability Fair Value 0   0
Qualifying Hedges | Interest rate contracts | Cash Flow Hedges | Loans      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional Amount 5,000   4,000
Asset Fair Value      
Asset Fair Value 0   0
Liability Fair Value      
Liability Fair Value 0   0
Non-qualifying Hedges      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional Amount 40,169   39,138
Asset Fair Value      
Asset Fair Value 498   534
Liability Fair Value      
Liability Fair Value (448)   (494)
Non-qualifying Hedges | Interest rate contracts      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional Amount 29,886   28,741
Asset Fair Value      
Asset Fair Value 356   385
Liability Fair Value      
Liability Fair Value (366)   (381)
Non-qualifying Hedges | Foreign exchange contract      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional Amount 8,893   8,912
Asset Fair Value      
Asset Fair Value 114   122
Liability Fair Value      
Liability Fair Value (82)   (113)
Non-qualifying Hedges | Foreign exchange spot contracts      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional Amount 253   252
Liability Fair Value      
Net fair value 0   0
Non-qualifying Hedges | Other contracts      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional Amount 1,390   1,485
Asset Fair Value      
Asset Fair Value 28   27
Liability Fair Value      
Liability Fair Value $ 0   $ 0