DEBT (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Short-Term Borrowings:
Commercial paper	$ 14,874,000,000	$ 17,878,000,000
Other short-term borrowings	44,029,000,000	41,066,000,000
Total short-term borrowings	58,903,000,000	58,944,000,000
Collateralized short-term advances from Federal Home Loan Bank	11,000,000,000	11,000,000,000
Significant Citibank Entities
Short-Term Borrowings:
Commercial paper	14,706,000,000	17,677,000,000
Parent
Short-Term Borrowings:
Commercial paper	$ 168,000,000	$ 201,000,000