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Fair Value - Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Financial assets [Abstract]    
Available-for-sale $ 837 $ 1,697
Mortgage loans 4,964 6,490
Derivative assets at fair value 171 1,225
Netting adjustment (237) (905)
Financial liabilities [Abstract]    
Derivative liabilities at fair value 233 1,495
Netting adjustment (1,173) (995)
Fannie Mae    
Financial liabilities [Abstract]    
Long-term debt 2,381 3,728
Consolidated Trusts    
Financial liabilities [Abstract]    
Long-term debt 21,735 24,586
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 64,531 97,179
Securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 83,581 130,456
Available-for-sale 0 0
Mortgage loans held for sale 0 0
Mortgage loans 0 0
Advances to lenders 0 0
Derivative assets at fair value 0 0
Guaranty assets and buy-ups 0 0
Total assets at fair value 148,112 227,635
Financial liabilities [Abstract]    
Derivative liabilities at fair value 0 0
Guaranty obligations 0 0
Total liabilities at fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fannie Mae    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Consolidated Trusts    
Financial liabilities [Abstract]    
Long-term debt 0 0
Significant Other Observable Inputs (Level 2)    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 44,100 18,444
Securities purchased under agreements to resell or similar arrangements 20,743 28,200
Trading securities 4,568 5,991
Available-for-sale 84 1,049
Mortgage loans held for sale 178 116
Mortgage loans 3,796,917 3,512,672
Advances to lenders 8,413 10,448
Derivative assets at fair value 256 1,748
Guaranty assets and buy-ups 0 0
Total assets at fair value 3,875,259 3,578,668
Financial liabilities [Abstract]    
Derivative liabilities at fair value 1,385 2,441
Guaranty obligations 0 0
Total liabilities at fair value 4,160,859 4,059,705
Significant Other Observable Inputs (Level 2) | Fannie Mae    
Financial liabilities [Abstract]    
Short-term debt 2,795 12,177
Long-term debt 205,142 288,414
Significant Other Observable Inputs (Level 2) | Consolidated Trusts    
Financial liabilities [Abstract]    
Long-term debt 3,951,537 3,756,673
Significant Unobservable Inputs (Level 3)    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 0 0
Securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 57 95
Available-for-sale 753 648
Mortgage loans held for sale 5,307 5,502
Mortgage loans 209,090 255,556
Advances to lenders 1 1
Derivative assets at fair value 152 382
Guaranty assets and buy-ups 207 258
Total assets at fair value 215,567 262,442
Financial liabilities [Abstract]    
Derivative liabilities at fair value 21 49
Guaranty obligations 101 82
Total liabilities at fair value 33,565 32,593
Significant Unobservable Inputs (Level 3) | Fannie Mae    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 799 878
Significant Unobservable Inputs (Level 3) | Consolidated Trusts    
Financial liabilities [Abstract]    
Long-term debt 32,644 31,584
Carrying value    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 108,631 115,623
Securities purchased under agreements to resell or similar arrangements 20,743 28,200
Trading securities 88,206 136,542
Available-for-sale 837 1,697
Mortgage loans held for sale 5,134 5,197
Mortgage loans 3,963,108 3,648,695
Advances to lenders 8,414 10,449
Derivative assets at fair value 171 1,225
Guaranty assets and buy-ups 92 115
Total assets at fair value 4,195,336 3,947,743
Financial liabilities [Abstract]    
Derivative liabilities at fair value 233 1,495
Guaranty obligations 101 127
Total liabilities at fair value 4,158,525 3,937,358
Carrying value | Fannie Mae    
Financial liabilities [Abstract]    
Short-term debt 2,795 12,173
Long-term debt 198,097 277,399
Carrying value | Consolidated Trusts    
Financial liabilities [Abstract]    
Long-term debt 3,957,299 3,646,164
Estimate of fair value    
Financial assets [Abstract]    
Cash and cash equivalents, including restricted cash and cash equivalents 108,631 115,623
Securities purchased under agreements to resell or similar arrangements 20,743 28,200
Trading securities 88,206 136,542
Available-for-sale 837 1,697
Mortgage loans held for sale 5,485 5,618
Mortgage loans 4,006,007 3,768,228
Advances to lenders 8,414 10,449
Derivative assets at fair value 171 1,225
Guaranty assets and buy-ups 207 258
Total assets at fair value 4,238,701 4,067,840
Financial liabilities [Abstract]    
Derivative liabilities at fair value 233 1,495
Guaranty obligations 101 82
Total liabilities at fair value 4,193,251 4,091,303
Estimate of fair value | Fannie Mae    
Financial liabilities [Abstract]    
Short-term debt 2,795 12,177
Long-term debt 205,941 289,292
Estimate of fair value | Consolidated Trusts    
Financial liabilities [Abstract]    
Long-term debt $ 3,984,181 $ 3,788,257