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BORROWED FUNDS - Short Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Short-term Debt [Line Items]    
Short-term borrowed funds $ 243 $ 274
Securities sold under agreements to repurchase    
Short-term Debt [Line Items]    
Short-term borrowed funds 231 265
Other short-term borrowed funds    
Short-term Debt [Line Items]    
Short-term borrowed funds $ 12 $ 9