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Fair Value Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (1,709) $ (2,266)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (2,297) (2,315)
Mortgage loans held for investment, at fair value 8,479 8,922
Derivative assets, gross amount offset (1,709) (2,266)
Derivative liabilities, gross amount offset (2,297) (2,315)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 40,170 34,073
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 35,266 35,502
Available-for-sale securities 0 0
Mortgage loans held for sale 0 0
Mortgage loans held for investment, at fair value 0 0
Advances to lenders 0 0
Derivatives assets at fair value 0 0
Guaranty assets and buy-ups 0 0
Total financial assets 75,436 69,575
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 0  
Derivative liabilities at fair value 0 0
Guaranty obligations 0 0
Total financial liabilities 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 20,800 15,350
Federal funds sold and securities purchased under agreements to resell or similar arrangements 19,562 32,938
Trading securities 7,526 6,332
Available-for-sale securities 1,939 2,477
Mortgage loans held for sale 826 238
Mortgage loans held for investment, at fair value 3,175,207 2,990,104
Advances to lenders 5,393 3,354
Derivatives assets at fair value 2,054 2,515
Guaranty assets and buy-ups 0 0
Total financial assets 3,233,307 3,053,308
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 131  
Derivative liabilities at fair value 3,063 3,077
Guaranty obligations 0 0
Total financial liabilities 3,423,669 3,303,620
Significant Unobservable Inputs (Level 3) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 0 0
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 74 33
Available-for-sale securities 822 952
Mortgage loans held for sale 11,112 7,856
Mortgage loans held for investment, at fair value 142,889 216,404
Advances to lenders 2 2
Derivatives assets at fair value 216 209
Guaranty assets and buy-ups 352 356
Total financial assets 155,467 225,812
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 0  
Derivative liabilities at fair value 33 15
Guaranty obligations 109 121
Total financial liabilities 37,336 39,950
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 6,370 6,826
Fannie Mae [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 0 0
Fannie Mae [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial liabilities [Abstract]    
Short-term debt 22,907 24,901
Long-term debt 201,775 211,403
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 826 771
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 22,771 23,753
Consolidated Trusts [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial liabilities [Abstract]    
Long-term debt 0 0
Consolidated Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,195,793 3,064,239
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Long-term debt 36,368 39,043
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 60,970 49,423
Federal funds sold and securities purchased under agreements to resell or similar arrangements 19,562 32,938
Trading securities 42,866 41,867
Available-for-sale securities 2,761 3,429
Mortgage loans held for sale 11,220 7,701
Mortgage loans held for investment, at fair value 3,262,012 3,241,694
Advances to lenders 5,395 3,356
Derivatives assets at fair value 561 458
Guaranty assets and buy-ups 152 147
Total financial assets 3,405,499 3,381,013
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 131  
Derivative liabilities at fair value 799 777
Guaranty obligations 166 160
Total financial liabilities 3,417,675 3,392,857
Carrying Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 22,901 24,896
Long-term debt 193,913 207,178
Carrying Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,199,765 3,159,846
Estimated of Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 60,970 49,423
Federal funds sold and securities purchased under agreements to resell or similar arrangements 19,562 32,938
Trading securities 42,866 41,867
Available-for-sale securities 2,761 3,429
Mortgage loans held for sale 11,938 8,094
Mortgage loans held for investment, at fair value 3,318,096 3,206,508
Advances to lenders 5,395 3,356
Derivatives assets at fair value 561 458
Guaranty assets and buy-ups 352 356
Total financial assets 3,462,501 3,346,429
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 131  
Derivative liabilities at fair value 799 777
Guaranty obligations 109 121
Total financial liabilities 3,458,708 3,341,255
Estimated of Fair Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 22,907 24,901
Long-term debt 202,601 212,174
Estimated of Fair Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt $ 3,232,161 $ 3,103,282