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Financial Guarantees Financial Guarantees and Maximum Recovery (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Financial Guarantees and Maximum Recovery [Line Items]    
Maximum Exposure $ 30,726 $ 31,573
Guaranty Obligation 320 329
Maximum Recovery 11,547 11,726
Fair Value of guaranty obligations in Investments in securities 518 488
Unconsolidated VIEs [Member] | Unconsolidated Fannie Mae MBS [Member]    
Financial Guarantees and Maximum Recovery [Line Items]    
Maximum Exposure 14,645 15,069
Guaranty Obligation 190 194
Maximum Recovery 8,672 8,857
Unconsolidated VIEs [Member] | Other guaranty arrangements [Member]    
Financial Guarantees and Maximum Recovery [Line Items]    
Maximum Exposure 16,081 16,504
Guaranty Obligation 130 135
Maximum Recovery $ 2,875 $ 2,869
Minimum [Member]    
Financial Guarantees and Maximum Recovery [Line Items]    
Remaining contractual terms of our guarantees 7 days  
Maximum [Member]    
Financial Guarantees and Maximum Recovery [Line Items]    
Remaining contractual terms of our guarantees 36 years