Consolidated Balance Sheets - USD ($)	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 14,674,000,000	$ 22,023,000,000
Restricted cash (includes $25,865 and $27,515, respectively, related to consolidated trusts)	30,879,000,000	32,542,000,000
Federal funds sold and securities purchased under agreements to resell or similar arrangements	27,350,000,000	30,950,000,000
Investments in securities:
Trading, at fair value	39,908,000,000	31,504,000,000
Available-for-sale, at fair value (includes $285 and $596, respectively, related to consolidated trusts)	20,230,000,000	30,654,000,000
Total investments in securities	60,138,000,000	62,158,000,000
Mortgage loans:
Loans held for sale, at lower of cost or fair value	5,361,000,000	331,000,000
Loans held for investment, at amortized cost	3,042,234,000,000	3,054,704,000,000
Allowance for loan losses	(27,951,000,000)	(35,541,000,000)
Total loans held for investment, net of allowance	3,014,283,000,000	3,019,163,000,000
Total mortgage loans	3,019,644,000,000	3,019,494,000,000
Deferred tax assets, net	37,187,000,000	42,206,000,000
Accrued interest receivable, net (includes $6,974 and $7,169, respectively, related to consolidated trusts)	7,726,000,000	8,193,000,000
Acquired property, net	6,766,000,000	10,618,000,000
Other assets	17,553,000,000	19,992,000,000
Total assets	3,221,917,000,000	3,248,176,000,000
Liabilities:
Accrued interest payable (includes $8,194 and $8,282, respectively, related to consolidated trusts)	9,794,000,000	10,232,000,000
Other liabilities (includes $448 and $503, respectively, related to consolidated trusts)	10,393,000,000	12,069,000,000
Total liabilities	3,217,858,000,000	3,244,456,000,000
Commitments and contingencies (Note 18)	0	0
Fannie Mae stockholders’ equity:
Senior preferred stock, 1,000,000 shares issued and outstanding	117,149,000,000	117,149,000,000
Preferred stock, 700,000,000 shares are authorized— 555,374,922 shares issued and outstanding	19,130,000,000	19,130,000,000
Common stock, no par value, no maximum authorization—1,308,762,703 shares issued and 1,158,082,750 shares outstanding	687,000,000	687,000,000
Accumulated deficit	(126,942,000,000)	(127,618,000,000)
Accumulated other comprehensive income	1,407,000,000	1,733,000,000
Treasury stock, at cost, 150,679,953 shares	(7,401,000,000)	(7,401,000,000)
Total Fannie Mae stockholders’ equity	4,030,000,000	3,680,000,000
Noncontrolling interest	29,000,000	40,000,000
Total equity (See Note 1: Senior Preferred Stock and Warrant Issued to Treasury and Earnings (Loss) per Share for information on our dividend obligation to Treasury)	4,059,000,000	3,720,000,000
Total liabilities and equity	3,221,917,000,000	3,248,176,000,000
Fannie Mae [Member]
Mortgage loans:
Loans held for investment, at amortized cost	233,054,000,000	272,360,000,000
Allowance for loan losses	(26,510,000,000)	(33,117,000,000)
Total mortgage loans	211,887,000,000	239,549,000,000
Liabilities:
Debt (includes $11,133 and $6,403, respectively, of debt of Fannie Mae and $23,609 and $19,483, respectively, of debt of consolidated trusts, at fair value)	386,135,000,000	460,443,000,000
Consolidated Trusts [Member]
ASSETS
Restricted cash (includes $25,865 and $27,515, respectively, related to consolidated trusts)	25,865,000,000	27,515,000,000
Investments in securities:
Available-for-sale, at fair value (includes $285 and $596, respectively, related to consolidated trusts)	285,000,000	596,000,000
Mortgage loans:
Loans held for investment, at amortized cost	2,809,180,000,000	2,782,344,000,000
Allowance for loan losses	(1,441,000,000)	(2,424,000,000)
Total mortgage loans	2,807,757,000,000	2,779,945,000,000
Accrued interest receivable, net (includes $6,974 and $7,169, respectively, related to consolidated trusts)	6,974,000,000	7,169,000,000
Total assets	2,850,000,000,000	2,830,000,000,000
Liabilities:
Accrued interest payable (includes $8,194 and $8,282, respectively, related to consolidated trusts)	8,194,000,000	8,282,000,000
Debt (includes $11,133 and $6,403, respectively, of debt of Fannie Mae and $23,609 and $19,483, respectively, of debt of consolidated trusts, at fair value)	2,811,536,000,000	2,761,712,000,000
Other liabilities (includes $448 and $503, respectively, related to consolidated trusts)	$ 448,000,000	$ 503,000,000