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DEBT - Short-Term Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Short-Term Borrowings:    
Commercial paper $ 18,010 $ 16,476
Other borrowings 11,504 28,573
Total short-term borrowings 29,514 45,049
Collateralized short-term advances from Federal Home Loan Bank $ 4,000 $ 17,600
Commercial paper    
Short-Term Borrowings:    
Weighted average coupon 0.77% 1.98%
Other borrowings    
Short-Term Borrowings:    
Weighted average coupon 0.48% 1.94%
Bank    
Short-Term Borrowings:    
Commercial paper $ 10,022 $ 10,155
Broker-dealer    
Short-Term Borrowings:    
Commercial paper $ 7,988 $ 6,321