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Investments in Securities Trading 1 (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 52,941 $ 48,123
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (2) (1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 88 130
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 10 13
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 105 340
Other [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   (1)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   130
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   0
Mortgage-related securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 8,141 8,543
Fannie Mae [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 3,530 3,424
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1) 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 66 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 10 10
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 105 337
Other agency [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 4,167 4,490
Private-label and other mortgage securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 444 629
Non-mortgage-related securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 44,800 39,580
U.S. Treasury securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 44,727 39,501
Other securities [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value 73 79
Variable Interest Entity, Primary Beneficiary [Member]    
Schedule of Investments in Trading Securities [Line Items]    
Trading, at fair value $ 863 $ 896