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Fair Value - Fair Value of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Derivative assets, gross amount offset $ (331) $ (905)
Financial liabilities [Abstract]    
Derivative liabilities, gross amount offset (849) (995)
Mortgage loans held for investment, net of allowance for loan losses 5,616 6,490
Derivative assets, gross amount offset (331) (905)
Derivative liabilities, gross amount offset (849) (995)
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 78,349 97,179
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 89,707 130,456
Available-for-sale securities 0 0
Mortgage loans held for sale 0 0
Mortgage loans held for investment, net of allowance for loan losses 0 0
Advances to lenders 0 0
Derivative assets at fair value 0 0
Guaranty assets and buy-ups 0 0
Total financial assets 168,056 227,635
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)    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 46,950 18,444
Federal funds sold and securities purchased under agreements to resell or similar arrangements 43,888 28,200
Trading securities 5,253 5,991
Available-for-sale securities 503 1,049
Mortgage loans held for sale 1,858 116
Mortgage loans held for investment, net of allowance for loan losses 3,688,808 3,512,672
Advances to lenders 6,256 10,448
Derivative assets at fair value 500 1,748
Guaranty assets and buy-ups 0 0
Total financial assets 3,794,016 3,578,668
Financial liabilities [Abstract]    
Derivative liabilities at fair value 1,335 2,441
Guaranty obligations 0 0
Total financial liabilities 4,153,252 4,059,705
Significant Unobservable Inputs (Level 3)    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 0 0
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 141 95
Available-for-sale securities 452 648
Mortgage loans held for sale 5,977 5,502
Mortgage loans held for investment, net of allowance for loan losses 234,637 255,556
Advances to lenders 1 1
Derivative assets at fair value 226 382
Guaranty assets and buy-ups 234 258
Total financial assets 241,668 262,442
Financial liabilities [Abstract]    
Derivative liabilities at fair value 32 49
Guaranty obligations 74 82
Total financial liabilities 31,993 32,593
Fannie Mae    
Financial liabilities [Abstract]    
Long-term debt 2,946 3,728
Fannie Mae | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial liabilities [Abstract]    
Of Fannie Mae 0 0
Long-term debt 0 0
Fannie Mae | Significant Other Observable Inputs (Level 2)    
Financial liabilities [Abstract]    
Of Fannie Mae 2,280 12,177
Long-term debt 258,200 288,414
Fannie Mae | Significant Unobservable Inputs (Level 3)    
Financial liabilities [Abstract]    
Of Fannie Mae 0 0
Long-term debt 844 878
Consolidated Trusts    
Financial liabilities [Abstract]    
Long-term debt 22,972 24,586
Consolidated Trusts | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial liabilities [Abstract]    
Long-term debt 0 0
Consolidated Trusts | Significant Other Observable Inputs (Level 2)    
Financial liabilities [Abstract]    
Long-term debt 3,891,437 3,756,673
Consolidated Trusts | Significant Unobservable Inputs (Level 3)    
Financial liabilities [Abstract]    
Long-term debt 31,043 31,584
Carrying Amount    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 125,299 115,623
Federal funds sold and securities purchased under agreements to resell or similar arrangements 43,888 28,200
Trading securities 95,101 136,542
Available-for-sale securities 955 1,697
Mortgage loans held for sale 6,933 5,197
Mortgage loans held for investment, net of allowance for loan losses 3,844,374 3,648,695
Advances to lenders 6,257 10,449
Derivative assets at fair value 395 1,225
Guaranty assets and buy-ups 102 115
Total financial assets 4,123,304 3,947,743
Financial liabilities [Abstract]    
Derivative liabilities at fair value 518 1,495
Guaranty obligations 112 127
Total financial liabilities 4,096,905 3,937,358
Carrying Amount | Fannie Mae    
Financial liabilities [Abstract]    
Of Fannie Mae 2,280 12,173
Long-term debt 249,296 277,399
Carrying Amount | Consolidated Trusts    
Financial liabilities [Abstract]    
Long-term debt 3,844,699 3,646,164
Fair Value    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 125,299 115,623
Federal funds sold and securities purchased under agreements to resell or similar arrangements 43,888 28,200
Trading securities 95,101 136,542
Available-for-sale securities 955 1,697
Mortgage loans held for sale 7,835 5,618
Mortgage loans held for investment, net of allowance for loan losses 3,923,445 3,768,228
Advances to lenders 6,257 10,449
Derivative assets at fair value 395 1,225
Guaranty assets and buy-ups 234 258
Total financial assets 4,203,409 4,067,840
Financial liabilities [Abstract]    
Derivative liabilities at fair value 518 1,495
Guaranty obligations 74 82
Total financial liabilities 4,184,396 4,091,303
Fair Value | Fannie Mae    
Financial liabilities [Abstract]    
Of Fannie Mae 2,280 12,177
Long-term debt 259,044 289,292
Fair Value | Consolidated Trusts    
Financial liabilities [Abstract]    
Long-term debt $ 3,922,480 $ 3,788,257