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LOANS - Non-Accrual Corporate Loans (Details) - Corporate loans - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Financing Receivable, Impaired [Line Items]          
Recorded investment $ 596   $ 596   $ 1,437
Recorded investment 402   402   445
Related specific allowance 171   171   362
Impaired Financing Receivable, Interest Income, Accrual Method 12 $ 13 30 $ 24  
Commercial and industrial          
Financing Receivable, Impaired [Line Items]          
Recorded investment 235   235   507
Recorded investment 176   176   210
Related specific allowance 110   110   168
Financial institutions          
Financing Receivable, Impaired [Line Items]          
Recorded investment 27   27   48
Recorded investment 11   11   3
Related specific allowance 5   5   15
Mortgage and real estate          
Financing Receivable, Impaired [Line Items]          
Recorded investment 254   254   697
Recorded investment 200   200   171
Related specific allowance 29   29   128
Lease financing          
Financing Receivable, Impaired [Line Items]          
Recorded investment 0   0   0
Other          
Financing Receivable, Impaired [Line Items]          
Recorded investment 80   80   185
Recorded investment 15   15   61
Related specific allowance $ 27   $ 27   $ 51