DEBT - Short-Term Borrowings (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Commercial paper	$ 10,109,000,000	$ 9,995,000,000
Other borrowings	19,418,000,000	11,084,000,000
Total short-term borrowings	29,527,000,000	21,079,000,000
Collateralized short-term advances from Federal Home Loan Bank	$ 10,000,000,000	$ 0