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Consolidations and Transfers of Financial Assets Unconsolidated VIEs (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Variable Interest Entities [Line Items]    
Trading, at fair value $ 42,866 $ 41,867
Available-for-sale, at fair value 2,761 3,429
Other assets 19,888 17,004
Other liabilities $ (10,001) (9,947)
Document Period End Date Jun. 30, 2019  
Unpaid principal balance of mortgage loans $ 3,243,452 3,223,783
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement 1,100 1,200
Multifamily [Member]    
Variable Interest Entities [Line Items]    
Unpaid principal balance of mortgage loans 310,899 293,858
Unconsolidated VIEs [Member] | Multifamily [Member]    
Variable Interest Entities [Line Items]    
Total unconsolidated assets 4,700 931
Unpaid principal balance of mortgage loans 310,900  
Unconsolidated VIEs [Member] | Mortgage-related securities [Member]    
Variable Interest Entities [Line Items]    
Trading, at fair value 6,525 6,231
Available-for-sale, at fair value 2,406 2,911
Other assets 60 66
Other liabilities (90) (101)
Net carrying amount 8,901 9,107
Maximum exposure to loss 20,000 14,000
Total unconsolidated assets 110,000 80,000
Unconsolidated VIEs [Member] | Partnership interest [Member]    
Variable Interest Entities [Line Items]    
Net carrying amount 75 89
Maximum exposure to loss 96 111
Total unconsolidated assets 2,100 2,300
Unconsolidated VIEs [Member] | Debt Securities [Member]    
Variable Interest Entities [Line Items]    
Maximum exposure to loss 4,600 920
Unconsolidated VIEs [Member] | Fannie Mae Securities [Member]    
Variable Interest Entities [Line Items]    
Trading, at fair value 2,173 1,422
Available-for-sale, at fair value 1,615 1,704
Unconsolidated VIEs [Member] | Non-Fannie Mae Securities [Member]    
Variable Interest Entities [Line Items]    
Trading, at fair value 4,352 4,809
Available-for-sale, at fair value $ 791 $ 1,207