LOANS - Performance of Modified Corporate Loans (Details) - Corporate $ in Millions	Dec. 31, 2023 USD ($)
Loans receivable
Total modified loans balance	$ 342
Current
Loans receivable
Total modified loans balance	342
30–89 days past due
Loans receivable
Total modified loans balance	0
90+ days past due
Loans receivable
Total modified loans balance	0
Commercial and industrial
Loans receivable
Total modified loans balance	198
Commercial and industrial | Current
Loans receivable
Total modified loans balance	198
Commercial and industrial | 30–89 days past due
Loans receivable
Total modified loans balance	0
Commercial and industrial | 90+ days past due
Loans receivable
Total modified loans balance	0
Financial institutions
Loans receivable
Total modified loans balance	0
Financial institutions | Current
Loans receivable
Total modified loans balance	0
Financial institutions | 30–89 days past due
Loans receivable
Total modified loans balance	0
Financial institutions | 90+ days past due
Loans receivable
Total modified loans balance	0
Mortgage and real estate
Loans receivable
Total modified loans balance	144
Mortgage and real estate | Current
Loans receivable
Total modified loans balance	144
Mortgage and real estate | 30–89 days past due
Loans receivable
Total modified loans balance	0
Mortgage and real estate | 90+ days past due
Loans receivable
Total modified loans balance	0
Other
Loans receivable
Total modified loans balance	0
Other | Current
Loans receivable
Total modified loans balance	0
Other | 30–89 days past due
Loans receivable
Total modified loans balance	0
Other | 90+ days past due
Loans receivable
Total modified loans balance	$ 0