Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets:
Cash and cash equivalents	$ 26,538	$ 38,337
Restricted Cash and Cash Equivalents (includes $80,899 and $68,308, respectively, related to consolidated trusts)	87,803	77,286
Federal funds sold and securities purchased under agreements to resell or similar arrangements (includes $40,837 and $0, respectively, related to consolidated trusts)	54,937	28,200
Investments in securities:
Debt Securities, Trading	111,256	136,542
Total fair value	1,502	1,697
Total investments in securities	112,758	138,239
Mortgage loans:
Loans held for sale, at lower of cost or fair value	7,824	5,197
Financing Receivable, before Allowance for Credit Loss	3,741,684	3,659,247
Allowance for loan losses	(9,628)	(10,552)
Total loans held for investment, net of allowance	3,732,056	3,648,695
Total mortgage loans	3,739,880	3,653,892
Advance to Lender	10,572	10,449
Deferred tax assets, net	12,516	12,947
Interest Receivable (includes $9,732 and $9,635, respectively, related to consolidated trusts and net of an allowance of $226, and $216)	(9,993)	(9,937)
Acquired property, net	1,183	1,261
Other assets	13,923	15,201
Total assets	4,070,103	3,985,749
Liabilities:
Interest Payable (includes $8,768 and $8,955, respectively, related to consolidated trusts)	9,585	9,719
Other Liabilities (includes $1,375 and $1,523, respectively, related to consolidated trusts)	16,313	15,035
Total liabilities	4,039,878	3,960,490
Commitments and contingencies (Note 13)	0	0
Fannie Mae stockholders’ equity:
Senior Preferred Stock Value	120,836	120,836
Preferred Stock, Value, Issued	19,130	19,130
Common Stock, Value, Issued	687	687
Accumulated deficit	(103,117)	(108,110)
Accumulated other comprehensive income	89	116
Treasury stock, at cost, 150,675,136 shares	(7,400)	(7,400)
Total stockholders’ equity (See Note 1: Senior Preferred Stock Purchase Agreement and Senior Preferred Stock for information on the related dividend obligation and liquidation preference)	30,225	25,259
Total liabilities and equity	4,070,103	3,985,749
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]
Mortgage loans:
Interest Receivable (includes $9,732 and $9,635, respectively, related to consolidated trusts and net of an allowance of $226, and $216)	(226)	(216)
Fannie Mae [Member]
Mortgage loans:
Financing Receivable, before Allowance for Credit Loss	103,310	112,726
Liabilities:
Debt (includes $3,336 and $3,728, respectively, of debt of Fannie Mae at fair value and $23,601 and $24,586 respectively, of debt of consolidated trusts, at fair value)	273,442	289,572
Consolidated Trusts [Member]
Assets:
Restricted Cash and Cash Equivalents (includes $80,899 and $68,308, respectively, related to consolidated trusts)	80,899	68,308
Federal funds sold and securities purchased under agreements to resell or similar arrangements (includes $40,837 and $0, respectively, related to consolidated trusts)	40,837	0
Investments in securities:
Debt Securities, Trading	741	793
Mortgage loans:
Financing Receivable, before Allowance for Credit Loss	3,638,374	3,546,521
Interest Receivable (includes $9,732 and $9,635, respectively, related to consolidated trusts and net of an allowance of $226, and $216)	(9,732)	(9,635)
Liabilities:
Interest Payable (includes $8,768 and $8,955, respectively, related to consolidated trusts)	8,768	8,955
Debt (includes $3,336 and $3,728, respectively, of debt of Fannie Mae at fair value and $23,601 and $24,586 respectively, of debt of consolidated trusts, at fair value)	3,740,538	3,646,164
Other Liabilities (includes $1,375 and $1,523, respectively, related to consolidated trusts)	$ 1,375	$ 1,523