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LOANS - Defaults of Modified Corporate Loans (Details) - Corporate
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Financing Receivable, Modified [Line Items]  
TDR balances $ 248
Total loans defaulted within one year of modification 0
Commercial and industrial  
Financing Receivable, Modified [Line Items]  
TDR balances 205
Total loans defaulted within one year of modification 0
Mortgage and real estate  
Financing Receivable, Modified [Line Items]  
TDR balances 20
Total loans defaulted within one year of modification 0
Other  
Financing Receivable, Modified [Line Items]  
TDR balances 23
Total loans defaulted within one year of modification $ 0