Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS - SCHEDULE OF SHORT-TERM DEBT (Details)

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BORROWINGS - SCHEDULE OF SHORT-TERM DEBT (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Short-term Debt [Line Items]    
Short-term Debt $ 435 $ 183
Federal Funds Purchased and Securities Sold under Agreements to Repurchase    
Short-term Debt [Line Items]    
Short-term Debt 401 71
Notes Payable, Other Payables    
Short-term Debt [Line Items]    
Short-term Debt $ 34 $ 112