Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Assets:
Cash and cash equivalents	$ 10,248	$ 32,110
Restricted cash (includes $21,420 and $22,132, respectively, related to consolidated trusts)	27,112	28,150
Federal funds sold and securities purchased under agreements to resell or similar arrangements	39,701	19,470
Investments in securities:
Trading, at fair value (includes $1,078 and $747, respectively, pledged as collateral)	40,097	34,679
Available-for-sale, at fair value	3,888	4,843
Total investments in securities	43,985	39,522
Mortgage loans:
Loans held for sale, at lower of cost or fair value	11,366	4,988
Loans held for investment, at amortized cost	3,205,154	3,192,621
Allowance for loan losses	(18,734)	(19,084)
Total loans held for investment, net of allowance	3,186,420	3,173,537
Total mortgage loans	3,197,786	3,178,525
Deferred tax assets, net	16,517	17,350
Accrued interest receivable, net (includes $7,535 and $7,560, respectively, related to consolidated trusts)	8,076	8,133
Acquired property, net	3,044	3,220
Other assets	17,933	19,049
Total assets	3,364,402	3,345,529
Liabilities:
Accrued interest payable (includes $8,682 and $8,598, respectively, related to consolidated trusts)	9,773	9,682
Other liabilities (includes $389 and $492, respectively, related to consolidated trusts)	10,219	9,479
Total liabilities	3,360,464	3,349,215
Commitments and contingencies (Note 14)	0	0
Stockholders’ equity:
Senior preferred stock, 1,000,000 shares issued and outstanding	120,836	117,149
Preferred stock, 700,000,000 shares are authorized—555,374,922 shares issued and outstanding	19,130	19,130
Common stock, no par value, no maximum authorization—1,308,762,703 shares issued and 1,158,087,567 shares outstanding	687	687
Accumulated deficit	(129,662)	(133,805)
Accumulated other comprehensive income	347	553
Treasury stock, at cost, 150,675,136 shares	(7,400)	(7,400)
Total stockholders’ equity (See Note 1: Senior Preferred Stock for information on our dividend to Treasury)	3,938	(3,686)
Total liabilities and equity (deficit)	3,364,402	3,345,529
Fannie Mae [Member]
Mortgage loans:
Loans held for investment, at amortized cost	147,270	162,809
Liabilities:
Debt (includes $7,860 and $8,186, respectively, of debt of Fannie Mae at fair value and $28,637 and $30,493, respectively, of debt of consolidated trusts, at fair value)	265,401	276,752
Consolidated Trusts [Member]
Assets:
Restricted cash (includes $21,420 and $22,132, respectively, related to consolidated trusts)	21,420	22,132
Mortgage loans:
Loans held for investment, at amortized cost	3,057,884	3,029,812
Accrued interest receivable, net (includes $7,535 and $7,560, respectively, related to consolidated trusts)	7,535	7,560
Liabilities:
Accrued interest payable (includes $8,682 and $8,598, respectively, related to consolidated trusts)	8,682	8,598
Debt (includes $7,860 and $8,186, respectively, of debt of Fannie Mae at fair value and $28,637 and $30,493, respectively, of debt of consolidated trusts, at fair value)	3,075,071	3,053,302
Other liabilities (includes $389 and $492, respectively, related to consolidated trusts)	$ 389	$ 492