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Consolidations and Transfers of Financial Assets Unconsolidated VIEs (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Variable Interest Entities [Line Items]    
Trading, at fair value $ 40,000 $ 39,908
Available-for-sale, at fair value 16,983 20,230
Other assets 18,218 17,553
Other liabilities (9,903) (10,393)
Unpaid principal balance of mortgage loans 3,012,569 3,010,753
Multifamily [Member]    
Variable Interest Entities [Line Items]    
Unpaid principal balance of mortgage loans 205,979 198,342
Consolidated VIEs [Member]    
Variable Interest Entities [Line Items]    
Change in assets due to change in consolidation status 135  
Unconsolidated VIEs [Member]    
Variable Interest Entities [Line Items]    
Change in assets due to change in consolidation status   3,000
Unconsolidated VIEs [Member] | Multifamily [Member]    
Variable Interest Entities [Line Items]    
Unpaid principal balance of mortgage loans 206,000  
Unconsolidated VIEs [Member] | Mortgage-related securities [Member]    
Variable Interest Entities [Line Items]    
Trading, at fair value 9,086 10,300
Available-for-sale, at fair value 15,662 18,580
Other assets 84 100
Other liabilities (691) (827)
Net carrying amount 24,141 28,153
Maximum exposure to loss 30,000 34,000
Total unconsolidated assets 180,000 220,000
Unconsolidated VIEs [Member] | Partnership interest [Member]    
Variable Interest Entities [Line Items]    
Net carrying amount 100 (24)
Maximum exposure to loss 133 12
Total unconsolidated assets 5,100 4,900
Unconsolidated VIEs [Member] | Fannie Mae Securities [Member]    
Variable Interest Entities [Line Items]    
Trading, at fair value 5,270 4,704
Available-for-sale, at fair value 3,833 3,936
Unconsolidated VIEs [Member] | Non-Fannie Mae Securities [Member]    
Variable Interest Entities [Line Items]    
Trading, at fair value 3,816 5,596
Available-for-sale, at fair value $ 11,829 $ 14,644