v3.26.1
FAIR VALUE ELECTIONS - Changes in Fair Value Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Securities borrowed and purchased under agreements to resell    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value $ (106) $ 8
Trading account assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value (4) 20
Investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value 0 0
Corporate loans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value 291 38
Consumer loans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value 0 6
Loans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value 291 44
MSRs    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value 5 (15)
Mortgage loans HFS    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value (5) 15
Total other assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value 0 0
Total assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value 181 72
Deposits    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value 24 (45)
Securities loaned and sold under agreements to repurchase    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value 94 19
Trading account liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value (201) (182)
Short-term borrowings    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value 454 (511)
Long-term debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value 2,351 (253)
Total liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions.    
Gain (loss) from changes in fair value $ 2,722 $ (972)