Organization - (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Product Information [Line Items]
On and Off Balance Sheet Program Assets, At Principal Balance	$ 13,950,312,000	$ 13,015,188,000	$ 11,913,302,000
Farm & Ranch [Member]
Product Information [Line Items]
On and Off Balance Sheet Program Assets, At Principal Balance	9,672,730,000	9,056,489,000	8,057,027,000
USDA Guarantees [Member]
Product Information [Line Items]
On and Off Balance Sheet Program Assets, At Principal Balance	1,687,117,000	1,615,579,000	1,513,177,000
Rural Utilities [Member]
Product Information [Line Items]
On and Off Balance Sheet Program Assets, At Principal Balance	2,590,465,000	2,343,120,000	2,343,098,000
Off-balance sheet [Member] | Rural Utilities Farmer Mac Guaranteed Securities AgVantage [Member]
Product Information [Line Items]
On and Off Balance Sheet Program Assets, At Principal Balance	11,000,000
Medium-term Notes [Member]
Product Information [Line Items]
Notes Payable	7,400,000,000
Discount Notes [Member]
Product Information [Line Items]
Notes Payable	$ 4,900,000,000