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COMMITMENTS AND CONTINGENT LIABILITIES - Funding Agreements (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Federal Home Loan Bank (FHLB)    
Restructuring Reserve [Roll Forward]    
Outstanding Balance, period start $ 7,615  
Issued During the Period 15,193  
Repaid During the Period (15,643)  
Long-term Agreements Maturing Within One Year 0  
Long-term Agreements Maturing Within Five Years 0  
Outstanding Balance, period end 7,165  
Difference related to remaining amortization 3 $ 3
Federal Home Loan Bank (FHLB) | Due in one year or less    
Restructuring Reserve [Roll Forward]    
Outstanding Balance, period start 6,168  
Issued During the Period 15,193  
Repaid During the Period (15,643)  
Long-term Agreements Maturing Within One Year 0  
Long-term Agreements Maturing Within Five Years 0  
Outstanding Balance, period end 5,718  
Federal Home Loan Bank (FHLB) | Total long-term funding agreements    
Restructuring Reserve [Roll Forward]    
Outstanding Balance, period start 1,447  
Issued During the Period 0  
Repaid During the Period 0  
Long-term Agreements Maturing Within One Year 0  
Long-term Agreements Maturing Within Five Years 0  
Outstanding Balance, period end 1,447  
Federal Home Loan Bank (FHLB) | Due in years two through five    
Restructuring Reserve [Roll Forward]    
Outstanding Balance, period start 799  
Issued During the Period 0  
Repaid During the Period 0  
Long-term Agreements Maturing Within One Year 0  
Long-term Agreements Maturing Within Five Years 0  
Outstanding Balance, period end 799  
Federal Home Loan Bank (FHLB) | Due in more than five years    
Restructuring Reserve [Roll Forward]    
Outstanding Balance, period start 648  
Issued During the Period 0  
Repaid During the Period 0  
Long-term Agreements Maturing Within One Year 0  
Long-term Agreements Maturing Within Five Years 0  
Outstanding Balance, period end 648  
Funding Agreement-Backed Notes Program (FABN)    
Restructuring Reserve [Roll Forward]    
Outstanding Balance, period start 6,284  
Issued During the Period 0  
Repaid During the Period 0  
Long-term Agreements Maturing Within One Year 0  
Long-term Agreements Maturing Within Five Years 0  
Foreign Currency Transaction Adjustment (16)  
Outstanding Balance, period end 6,268  
Difference related to remaining amortization 16 $ 17
Funding Agreement-Backed Notes Program (FABN) | Due in one year or less    
Restructuring Reserve [Roll Forward]    
Outstanding Balance, period start 1,000  
Issued During the Period 0  
Repaid During the Period 0  
Long-term Agreements Maturing Within One Year 0  
Long-term Agreements Maturing Within Five Years 0  
Foreign Currency Transaction Adjustment 0  
Outstanding Balance, period end 1,000  
Funding Agreement-Backed Notes Program (FABN) | Total long-term funding agreements    
Restructuring Reserve [Roll Forward]    
Outstanding Balance, period start 5,284  
Issued During the Period 0  
Repaid During the Period 0  
Long-term Agreements Maturing Within One Year 0  
Long-term Agreements Maturing Within Five Years 0  
Foreign Currency Transaction Adjustment (16)  
Outstanding Balance, period end 5,268  
Funding Agreement-Backed Notes Program (FABN) | Due in years two through five    
Restructuring Reserve [Roll Forward]    
Outstanding Balance, period start 4,984  
Issued During the Period 0  
Repaid During the Period 0  
Long-term Agreements Maturing Within One Year 0  
Long-term Agreements Maturing Within Five Years 0  
Foreign Currency Transaction Adjustment (16)  
Outstanding Balance, period end 4,968  
Funding Agreement-Backed Notes Program (FABN) | Due in more than five years    
Restructuring Reserve [Roll Forward]    
Outstanding Balance, period start 300  
Issued During the Period 0  
Repaid During the Period 0  
Long-term Agreements Maturing Within One Year 0  
Long-term Agreements Maturing Within Five Years 0  
Foreign Currency Transaction Adjustment 0  
Outstanding Balance, period end $ 300