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Consolidations and Transfers of Financial Assets Unconsolidated VIEs (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Assets and liabilities recorded in our condensed consolidated balance sheets related to mortgage-backed trusts: [Abstract]    
Trading, at fair value $ 31,795 $ 30,768
Available-for-sale, at fair value 37,128 38,171
Other assets 22,392 20,231
Other liabilities (13,012) (15,441)
Unconsolidated VIEs [Member] | Mortgage-Backed Trusts [Member]
   
Assets and liabilities recorded in our condensed consolidated balance sheets related to mortgage-backed trusts: [Abstract]    
Trading, at fair value 13,982 14,219
Available-for-sale, at fair value 32,656 33,307
Other assets 119 119
Other liabilities (1,734) (1,668)
Net carrying amount 45,023 45,977
Maximum exposure to loss 52,360 [1] 54,148 [1]
Total assets of unconsolidated mortgage-backed trusts 281,719 313,202
Unconsolidated VIEs [Member] | Limited Partnership Investments [Member]
   
Assets and liabilities recorded in our condensed consolidated balance sheets related to mortgage-backed trusts: [Abstract]    
Maximum exposure to loss 15 14
Total assets of unconsolidated mortgage-backed trusts 6,700 6,800
Fannie Mae Securities [Member]
   
Assets and liabilities recorded in our condensed consolidated balance sheets related to mortgage-backed trusts: [Abstract]    
Trading, at fair value 5,785 5,660
Trading, at fair value 5,983 5,870
Available-for-sale, at fair value 5,593 5,866
Non-Fannie Mae Securities [Member]
   
Assets and liabilities recorded in our condensed consolidated balance sheets related to mortgage-backed trusts: [Abstract]    
Trading, at fair value 8,197 8,559
Available-for-sale, at fair value $ 27,063 $ 27,441
[1] Our maximum exposure to loss generally represents the greater of our recorded investment in the entity or the unpaid principal balance of the assets covered by our guaranty. However, our securities issued by Fannie Mae multi-class resecuritization trusts that are not consolidated do not give rise to any additional exposure to loss as we already consolidate the underlying collateral.