DEBT (Details 2) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Long-Term Debt:
Total long-term debt	$ 220,959,000,000	$ 239,463,000,000
Trust assets	0
Junior subordinated notes relating to trust preferred securities
Long-Term Debt:
Total long-term debt	6,600,000,000	10,100,000,000
Citigroup Parent Company
Long-Term Debt:
Total long-term debt	162,541,000,000	176,553,000,000
Bank
Long-Term Debt:
Total long-term debt	48,315,000,000	51,234,000,000
Collateralized long-term advances from Federal Home Loan Bank	14,500,000,000	16,300,000,000
Non-bank
Long-Term Debt:
Total long-term debt	10,103,000,000	11,676,000,000
Citigroup Funding Inc. (CFI)
Long-Term Debt:
Carrying value of Principal-Protected Trust Securities	$ 160,000,000	$ 186,000,000