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Consolidations and Transfers of Financial Assets Transfers of Financial Assets (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Unconsolidated VIEs [Member]
Jun. 30, 2011
Unconsolidated VIEs [Member]
Jun. 30, 2012
Unconsolidated VIEs [Member]
Jun. 30, 2011
Unconsolidated VIEs [Member]
Jun. 30, 2012
Unconsolidated VIEs [Member]
Fannie Mae Single-class MBS & Fannie Mae Megas [Member]
Dec. 31, 2011
Unconsolidated VIEs [Member]
Fannie Mae Single-class MBS & Fannie Mae Megas [Member]
Jun. 30, 2012
Unconsolidated VIEs [Member]
REMICS & SMBS [Member]
Dec. 31, 2011
Unconsolidated VIEs [Member]
REMICS & SMBS [Member]
Transfers of Financial Assets [Line Items]                        
Unpaid principal balance portfolio securitizations $ 46,400,000,000 $ 27,300,000,000 $ 88,100,000,000 $ 56,600,000,000                
Unpaid principal balance                 526,000,000 588,000,000 10,407,000,000 [1] 12,697,000,000 [1]
Fair value                 585,000,000 654,000,000 11,679,000,000 [1] 14,043,000,000 [1]
Weighted-average coupon                 6.21% 6.21% 5.67% [1] 5.86% [1]
Weighted-average loan age                 5 years 11 months 5 years 5 months 4 years 4 months [1] 4 years 6 months [1]
Weighted-average maturity                 23 years 23 years 6 months 16 years 1 month [1] 18 years 7 months [1]
Principal and interest received on retained interest         $ 636,000,000 $ 715,000,000 $ 1,300,000,000 $ 1,500,000,000        
[1] Consists of Real Estate Mortgage Investment Conduits (“REMICs”) and stripped mortgage-backed securities (“SMBS”).