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Financial Guarantees (Narratives) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Guarantor Obligations [Line Items]    
Maximum Exposure $ 40,534 [1] $ 49,915 [1]
Single-Family [Member] | Minimum [Member]
   
Guarantor Obligations [Line Items]    
Serious delinquency, days past due 90 days 90 days
Multifamily [Member] | Minimum [Member]
   
Guarantor Obligations [Line Items]    
Serious delinquency, days past due 60 days 60 days
Multifamily [Member] | Maximum [Member]
   
Guarantor Obligations [Line Items]    
Serious delinquency, days past due 89 days 89 days
[1] Primarily consists of the unpaid principal balance of the underlying mortgage loans.