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Fair Value of Financial Instruments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value Measurement [Domain]    
Financial assets [Abstract]    
Netting adjustment $ (905) $ (1,288)
Financial liabilities [Abstract]    
Netting adjustment (995) (1,694)
Mortgage loans held for investment, at fair value 6,490 7,825
Netting adjustment (905) (1,288)
Netting adjustment (995) (1,694)
Fair Value, Recurring [Member]    
Financial assets [Abstract]    
Trading securities 136,542 48,123
Available-for-sale securities 1,697 2,404
Mortgage loans held for investment, at fair value 6,490 7,825
Derivative assets at fair value 1,225 271
Netting adjustment (905) (1,288)
Total assets at fair value 147,074 58,623
Financial liabilities [Abstract]    
Long-term debt 28,314 27,567
Derivatives liabilities at fair value 1,495 435
Netting adjustment (995) (1,694)
Total liabilities at fair value 29,809 28,002
Other [Member] | Fair Value, Recurring [Member]    
Financial assets [Abstract]    
Available-for-sale securities 242 314
Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 24,586 21,880
Consolidated Trusts [Member] | Fair Value, Recurring [Member]    
Financial liabilities [Abstract]    
Long-term debt 24,586 21,880
Fannie Mae [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,728 5,687
Fannie Mae [Member] | Fair Value, Recurring [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,728 5,687
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 97,179 50,057
Federal funds sold and securities purchased under agreements to resell or similar arrangements 0 0
Trading securities 130,456 39,501
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
Derivative assets at fair value 0 0
Guaranty assets and buy-ups 0 0
Total assets at fair value 227,635 89,558
Financial liabilities [Abstract]    
Derivatives 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) [Member] | Fair Value, Recurring [Member]    
Financial assets [Abstract]    
Trading securities 130,456 39,501
Available-for-sale securities 0 0
Mortgage loans held for investment, at fair value 0 0
Derivative assets at fair value 0 0
Total assets at fair value 131,576 39,501
Financial liabilities [Abstract]    
Long-term debt 0 0
Derivatives liabilities at fair value 0 0
Total liabilities at fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other [Member] | Fair Value, Recurring [Member]    
Financial assets [Abstract]    
Available-for-sale securities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Consolidated Trusts [Member] | Fair Value, Recurring [Member]    
Financial liabilities [Abstract]    
Long-term debt 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fannie Mae [Member] | Fair Value, Recurring [Member]    
Financial liabilities [Abstract]    
Long-term debt 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 18,444 11,350
Federal funds sold and securities purchased under agreements to resell or similar arrangements 28,200 13,578
Trading securities 5,991 8,576
Available-for-sale securities 1,049 1,612
Mortgage loans held for sale 116 229
Mortgage loans held for investment, at fair value 3,512,672 3,270,535
Advances to lenders 10,448 6,451
Derivative assets at fair value 1,748 1,360
Guaranty assets and buy-ups 0 0
Total assets at fair value 3,578,668 3,313,691
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure   478
Derivatives liabilities at fair value 2,441 2,092
Guaranty obligations 0 0
Total liabilities at fair value 4,059,705 3,506,144
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Recurring [Member]    
Financial assets [Abstract]    
Trading securities 5,991 8,576
Available-for-sale securities 1,049 1,612
Mortgage loans held for investment, at fair value 5,629 7,137
Derivative assets at fair value 1,748 1,360
Total assets at fair value 14,417 18,685
Financial liabilities [Abstract]    
Long-term debt 27,815 27,094
Derivatives liabilities at fair value 2,441 2,092
Total liabilities at fair value 30,256 29,186
Significant Other Observable Inputs (Level 2) [Member] | Other [Member] | Fair Value, Recurring [Member]    
Financial assets [Abstract]    
Available-for-sale securities 7 8
Significant Other Observable Inputs (Level 2) [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,756,673 3,312,763
Significant Other Observable Inputs (Level 2) [Member] | Consolidated Trusts [Member] | Fair Value, Recurring [Member]    
Financial liabilities [Abstract]    
Long-term debt 24,503 21,805
Significant Other Observable Inputs (Level 2) [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 12,177 26,667
Long-term debt 288,414 164,144
Significant Other Observable Inputs (Level 2) [Member] | Fannie Mae [Member] | Fair Value, Recurring [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,312 5,289
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 95 46
Available-for-sale securities 648 792
Mortgage loans held for sale 5,502 7,054
Mortgage loans held for investment, at fair value 255,556 127,650
Advances to lenders 1 2
Derivative assets at fair value 382 199
Guaranty assets and buy-ups 258 305
Total assets at fair value 262,442 136,048
Financial liabilities [Abstract]    
Derivatives liabilities at fair value 49 37
Guaranty obligations 82 97
Total liabilities at fair value 32,593 32,362
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Recurring [Member]    
Financial assets [Abstract]    
Trading securities 95 46
Available-for-sale securities 648 792
Mortgage loans held for investment, at fair value 861 688
Derivative assets at fair value 382 199
Total assets at fair value 1,986 1,725
Financial liabilities [Abstract]    
Long-term debt 499 473
Derivatives liabilities at fair value 49 37
Total liabilities at fair value 548 510
Significant Unobservable Inputs (Level 3) [Member] | Other [Member] | Fair Value, Recurring [Member]    
Financial assets [Abstract]    
Available-for-sale securities 235 306
Significant Unobservable Inputs (Level 3) [Member] | Other [Member] | Fair Value, Recurring [Member] | Discounted cash flow with inputs [Member]    
Financial assets [Abstract]    
Available-for-sale securities $ 206 $ 267
Significant Unobservable Inputs (Level 3) [Member] | Minimum [Member] | Available-for-sale securities [Member] | Other [Member] | Fair Value, Recurring [Member] | Measurement Input, Default Rate [Member] | Discounted cash flow with inputs [Member]    
Financial assets [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 425.0 3.000
Significant Unobservable Inputs (Level 3) [Member] | Maximum [Member] | Available-for-sale securities [Member] | Other [Member] | Fair Value, Recurring [Member] | Measurement Input, Default Rate [Member] | Discounted cash flow with inputs [Member]    
Financial assets [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 443.0 3.000
Significant Unobservable Inputs (Level 3) [Member] | Weighted Average [Member] | Available-for-sale securities [Member] | Other [Member] | Fair Value, Recurring [Member] | Measurement Input, Default Rate [Member] | Discounted cash flow with inputs [Member]    
Financial assets [Abstract]    
Debt Securities, Available-for-sale, Measurement Input 434.2 3.000
Significant Unobservable Inputs (Level 3) [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt $ 31,584 $ 31,827
Significant Unobservable Inputs (Level 3) [Member] | Consolidated Trusts [Member] | Fair Value, Recurring [Member]    
Financial liabilities [Abstract]    
Long-term debt 83 75
Significant Unobservable Inputs (Level 3) [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 0 0
Long-term debt 878 401
Significant Unobservable Inputs (Level 3) [Member] | Fannie Mae [Member] | Fair Value, Recurring [Member]    
Financial liabilities [Abstract]    
Long-term debt 416 398
Carrying Value [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 115,623 61,407
Federal funds sold and securities purchased under agreements to resell or similar arrangements 28,200 13,578
Trading securities 136,542 48,123
Available-for-sale securities 1,697 2,404
Mortgage loans held for sale 5,197 6,773
Mortgage loans held for investment, at fair value 3,648,695 3,327,389
Advances to lenders 10,449 6,453
Derivative assets at fair value 1,225 271
Guaranty assets and buy-ups 115 142
Total assets at fair value 3,947,743 3,466,540
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure   478
Derivatives liabilities at fair value 1,495 435
Guaranty obligations 127 154
Total liabilities at fair value 3,937,358 3,468,453
Carrying Value [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,646,164 3,285,139
Carrying Value [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 12,173 26,662
Long-term debt 277,399 155,585
Estimate of Fair Value Measurement [Member]    
Financial assets [Abstract]    
Cash and cash equivalents and restricted cash 115,623 61,407
Federal funds sold and securities purchased under agreements to resell or similar arrangements 28,200 13,578
Trading securities 136,542 48,123
Available-for-sale securities 1,697 2,404
Mortgage loans held for sale 5,618 7,283
Mortgage loans held for investment, at fair value 3,768,228 3,398,185
Advances to lenders 10,449 6,453
Derivative assets at fair value 1,225 271
Guaranty assets and buy-ups 258 305
Total assets at fair value 4,067,840 3,538,009
Financial liabilities [Abstract]    
Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure   478
Derivatives liabilities at fair value 1,495 435
Guaranty obligations 82 97
Total liabilities at fair value 4,091,303 3,536,812
Estimate of Fair Value Measurement [Member] | Consolidated Trusts [Member]    
Financial liabilities [Abstract]    
Long-term debt 3,788,257 3,344,590
Estimate of Fair Value Measurement [Member] | Fannie Mae [Member]    
Financial liabilities [Abstract]    
Short-term debt 12,177 26,667
Long-term debt $ 289,292 $ 164,545