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Consolidations and Transfers of Financial Assets Transfers of Financial Assets (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Unconsolidated VIEs [Member]
Sep. 30, 2013
Unconsolidated VIEs [Member]
Sep. 30, 2014
Unconsolidated VIEs [Member]
Sep. 30, 2013
Unconsolidated VIEs [Member]
Sep. 30, 2014
Unconsolidated VIEs [Member]
Fannie Mae Single-class MBS & Fannie Megas [Member]
Dec. 31, 2013
Unconsolidated VIEs [Member]
Fannie Mae Single-class MBS & Fannie Megas [Member]
Sep. 30, 2014
Unconsolidated VIEs [Member]
REMICS & SMBS [Member]
Dec. 31, 2013
Unconsolidated VIEs [Member]
REMICS & SMBS [Member]
Transfers of Financial Assets [Line Items]                        
Unpaid principal balance portfolio securitizations $ 44,200,000,000 $ 52,200,000,000 $ 113,100,000,000 $ 184,000,000,000                
Unpaid principal balance                 297,000,000 349,000,000 6,576,000,000 [1] 6,899,000,000 [1]
Fair value                 330,000,000 383,000,000 7,667,000,000 [1] 7,959,000,000 [1]
Weighted-average coupon (as a percent)                 6.19% 6.21% 5.25% [1] 5.36% [1]
Weighted-average loan age (in years)                 8 years 2 months 7 years 5 months 5 years 11 months [1] 5 years 5 months [1]
Weighted-average maturity (in years)                 20 years 8 months 21 years 6 months 10 years 9 months [1] 12 years 7 months [1]
Principal and interest received on retained interests         $ 386,000,000 $ 434,000,000 $ 1,100,000,000 $ 1,400,000,000        
[1] Consists of real estate mortgage investment conduits (“REMICs”) and stripped mortgage-backed securities (“SMBS”).