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DEBT - Short-Term Borrowings (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Short-term Debt [Line Items]    
Commercial paper $ 25,578 $ 16,018
Other borrowings 21,790 11,955
Total short-term borrowings 47,368 27,973
Collateralized short-term advances from Federal Home Loan Bank 12,000 0
Bank    
Short-term Debt [Line Items]    
Commercial paper 11,113 9,026
Broker-dealer and other    
Short-term Debt [Line Items]    
Commercial paper $ 14,465 $ 6,992