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ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses for Other Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]    
Allowance for credit losses on other assets at beginning of quarter(2) $ 147 $ 1,865
Gross credit losses (10) (17)
Gross recoveries 7 4
NCLs (3) (13)
Net reserve builds (releases) 30 26
Total provision for credit losses 33 39
Other, net 9 315
Allowance for credit losses on other assets at end of quarter 186 2,206
Deposits with banks    
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]    
Allowance for credit losses on other assets at beginning of quarter(2) 23 25
Gross credit losses 0 0
Gross recoveries 0 0
NCLs 0 0
Net reserve builds (releases) 8 (6)
Total provision for credit losses 8 (6)
Other, net 1 0
Allowance for credit losses on other assets at end of quarter 32 19
Securities borrowed and purchased under agreements to resell    
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]    
Allowance for credit losses on other assets at beginning of quarter(2) 5 3
Gross credit losses 0 0
Gross recoveries 0 0
NCLs 0 0
Net reserve builds (releases) 0 1
Total provision for credit losses 0 1
Other, net 0 0
Allowance for credit losses on other assets at end of quarter 5 4
All other assets    
Financing Receivable, Other Assets, Allowance For Credit Loss [Roll Forward]    
Allowance for credit losses on other assets at beginning of quarter(2) 119 1,837
Gross credit losses (10) (17)
Gross recoveries 7 4
NCLs (3) (13)
Net reserve builds (releases) 22 31
Total provision for credit losses 25 44
Other, net 8 315
Allowance for credit losses on other assets at end of quarter $ 149 $ 2,183