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Financial Guarantees and Maximum Recovery (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Financial Guarantees and Maximum Recovery [Line Items]    
Maximum Exposure $ 33,561 $ 35,965
Guaranty Obligation 355 382
Maximum Recovery 13,721 14,222
Fair Value of guaranty obligations in Investments in Securities 679 797
Unconsolidated VIEs [Member] | Unconsolidated Fannie Mae MBS [Member]    
Financial Guarantees and Maximum Recovery [Line Items]    
Maximum Exposure 16,066 17,184
Guaranty Obligation 203 214
Maximum Recovery 9,315 9,775
Unconsolidated VIEs [Member] | Other guaranty arrangements [Member]    
Financial Guarantees and Maximum Recovery [Line Items]    
Maximum Exposure 17,495 18,781
Guaranty Obligation 152 168
Maximum Recovery $ 4,406 $ 4,447
Minimum [Member]    
Financial Guarantees and Maximum Recovery [Line Items]    
Remaining contractual terms of our guarantees 1 day  
Maximum [Member]    
Financial Guarantees and Maximum Recovery [Line Items]    
Remaining contractual terms of our guarantees 37 years