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Fair Value Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (2,608) $ (4,272)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (2,756) (4,979)
Mortgage loans held for investment, at fair value 9,628 10,596
Derivative assets, gross amount offset (2,608) (4,272)
Derivative liabilities, gross amount offset (2,756) (4,979)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 37,679 35,060
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 35,663 29,222
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 73,342 64,282
Financial liabilities [Abstract]    
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 11,050 25,200
Federal funds sold and securities purchased under agreements to resell or similar arrangements 16,300 19,470
Trading securities 6,638 4,256
Available-for-sale securities 2,630 3,530
Mortgage loans held for sale 1,436 101
Mortgage loans held for investment, at fair value 2,917,541 2,886,470
Advances to lenders 3,899 4,936
Derivatives assets at fair value 2,851 4,274
Guaranty assets and buy-ups 0 0
Total financial assets 2,962,345 2,948,237
Financial liabilities [Abstract]    
Derivative liabilities at fair value 3,348 5,272
Guaranty obligations 0 0
Total financial liabilities 3,231,716 3,302,681
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 80 1,201
Available-for-sale securities 1,093 1,313
Mortgage loans held for sale 13,894 5,333
Mortgage loans held for investment, at fair value 231,082 315,719
Advances to lenders 2 2
Derivatives assets at fair value 129 169
Guaranty assets and buy-ups 370 436
Total financial assets 246,650 324,173
Financial liabilities [Abstract]    
Derivative liabilities at fair value 12 35
Guaranty obligations 121 456
Total financial liabilities 42,250 42,389
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 7,558 8,186
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 25,730 33,379
Long-term debt 228,853 249,780
Fannie Mae [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 791 837
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 26,675 30,493
Consolidated Trusts [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
Consolidated Trusts [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 2,973,785 3,014,250
Consolidated Trusts [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial liabilities [Abstract]    
Short-term debt 338 378
Long-term debt 40,988 40,683
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 48,729 60,260
Federal funds sold and securities purchased under agreements to resell or similar arrangements 16,300 19,470
Trading securities 42,381 34,679
Available-for-sale securities 3,723 4,843
Mortgage loans held for sale 14,323 4,988
Mortgage loans held for investment, at fair value 3,194,301 3,173,537
Advances to lenders 3,901 4,938
Derivatives assets at fair value 372 171
Guaranty assets and buy-ups 151 149
Total financial assets 3,324,181 3,303,035
Financial liabilities [Abstract]    
Derivative liabilities at fair value 604 328
Guaranty obligations 163 258
Total financial liabilities 3,338,256 3,330,640
Carrying Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 25,726 33,377
Long-term debt 224,964 243,375
Carrying Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Short-term debt 339 379
Long-term debt 3,086,460 3,052,923
Estimated of Fair Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 48,729 60,260
Federal funds sold and securities purchased under agreements to resell or similar arrangements 16,300 19,470
Trading securities 42,381 34,679
Available-for-sale securities 3,723 4,843
Mortgage loans held for sale 15,330 5,434
Mortgage loans held for investment, at fair value 3,148,623 3,202,189
Advances to lenders 3,901 4,938
Derivatives assets at fair value 372 171
Guaranty assets and buy-ups 370 436
Total financial assets 3,279,729 3,332,420
Financial liabilities [Abstract]    
Derivative liabilities at fair value 604 328
Guaranty obligations 121 456
Total financial liabilities 3,271,210 3,340,091
Estimated of Fair Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 25,730 33,379
Long-term debt 229,644 250,617
Estimated of Fair Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Short-term debt 338 378
Long-term debt $ 3,014,773 $ 3,054,933