DEBT - Short-Term Borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Short-Term Borrowings:
Commercial paper	$ 20,222	$ 25,530
Other borrowings	17,235	21,566
Total short-term borrowings	37,457	47,096
Collateralized short-term advances from Federal Home Loan Bank	$ 8,000	$ 12,000
Commercial paper
Short-Term Borrowings:
Weighted average coupon	5.72%	4.29%
Other borrowings
Short-Term Borrowings:
Weighted average coupon	5.45%	4.23%
Bank
Short-Term Borrowings:
Commercial paper	$ 11,116	$ 11,185
Broker-dealer and other
Short-Term Borrowings:
Commercial paper	$ 9,106	$ 14,345