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Consolidations and Transfers of Financial Assets Unconsolidated VIEs (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Variable Interest Entities [Line Items]    
Trading, at fair value $ 34,679 $ 40,562
Available-for-sale securities 4,843 8,363
Other assets 19,049 20,942
Other liabilities (9,479) (10,150)
Unpaid principal balance of mortgage loans 3,155,703 3,063,646
Multifamily [Member]    
Variable Interest Entities [Line Items]    
Unpaid principal balance of mortgage loans 265,069 229,896
Consolidated VIEs [Member]    
Variable Interest Entities [Line Items]    
Available-for-sale securities 87 107
Other liabilities (492) (390)
Unconsolidated VIEs [Member] | Multifamily [Member]    
Variable Interest Entities [Line Items]    
Unpaid principal balance of mortgage loans 265,100  
Unconsolidated VIEs [Member] | Fannie Mae Securities [Member]    
Variable Interest Entities [Line Items]    
Trading, at fair value 3,809 4,642
Available-for-sale securities 2,032 2,447
Unconsolidated VIEs [Member] | Non-Fannie Mae Securities [Member]    
Variable Interest Entities [Line Items]    
Trading, at fair value 1,580 3,473
Available-for-sale securities 2,062 4,879
Unconsolidated VIEs [Member] | Mortgage-related securities [Member]    
Variable Interest Entities [Line Items]    
Trading, at fair value 5,389 8,115
Available-for-sale securities 4,094 7,326
Other assets 74 77
Other liabilities (467) (528)
Net carrying amount 9,090 14,990
Maximum exposure to loss 15,000 21,000
Total unconsolidated assets 70,000 150,000
Unconsolidated VIEs [Member] | Partnership Interest [Member]    
Variable Interest Entities [Line Items]    
Net carrying amount 82 92
Maximum exposure to loss 105 118
Total unconsolidated assets $ 3,200 $ 3,900