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Financial Guarantees and Maximum Recovery (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Financial Guarantees and Maximum Recovery [Line Items]    
Maximum exposure $ 27,942 $ 31,573
Guaranty obligation 280 329
Maximum recovery 10,711 11,726
Unconsolidated VIEs [Member] | Unconsolidated Fannie Mae MBS [Member]    
Financial Guarantees and Maximum Recovery [Line Items]    
Maximum exposure 12,607 15,069
Guaranty obligation 143 194
Maximum recovery 8,048 8,857
Unconsolidated VIEs [Member] | Other guaranty arrangements [Member]    
Financial Guarantees and Maximum Recovery [Line Items]    
Maximum exposure 15,335 16,504
Guaranty obligation 137 135
Maximum recovery $ 2,663 $ 2,869
Minimum [Member]    
Financial Guarantees and Maximum Recovery [Line Items]    
Contractual terms of our guarantees1 1 day  
Maximum [Member]    
Financial Guarantees and Maximum Recovery [Line Items]    
Contractual terms of our guarantees1 36 years