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BORROWED FUNDS - Maturities of Long-term Borrowed Funds (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
2022 $ 1,931  
2023 765  
2024 108  
2025 1,229  
2026 1,022  
2026 and thereafter 1,877  
Total 6,932 $ 8,346
Parent Company    
Debt Instrument [Line Items]    
2022 168  
2023 0  
2024 107  
2025 469  
2026 498  
2026 and thereafter 1,857  
Total 3,099  
Banking Subsidiaries    
Debt Instrument [Line Items]    
2022 1,763  
2023 765  
2024 1  
2025 760  
2026 524  
2026 and thereafter 20  
Total $ 3,833