Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Restricted cash (includes $25,865 and $27,515, respectively, related to consolidated trusts)	$ 30,879	$ 32,542
Investments in securities:
Available-for-sale, at fair value (includes $285 and $596, respectively, related to consolidated trusts)	20,230	30,654
Mortgage loans:
Loans held for investment, at amortized cost of consolidated trusts (includes $14,075 and $15,629, respectively, at fair value)	14,075	15,629
Accrued interest receivable, net (includes $6,974 and $7,169, respectively, related to consolidated trusts)	7,726	8,193
Liabilities:
Accrued interest payable (includes $8,194 and $8,282, respectively, related to consolidated trusts)	9,794	10,232
Other liabilities (includes $448 and $503, respectively, related to consolidated trusts)	$ 10,393	$ 12,069
Fannie Mae stockholders’ equity:
Senior preferred stock, 1,000,000 shares issued	1,000,000	1,000,000
Senior preferred stock, 1,000,000 shares outstanding	1,000,000	1,000,000
Preferred stock, 700,000,000 shares are authorized	700,000,000	700,000,000
Preferred stock, 555,374,922 shares issued	555,374,922	555,374,922
Preferred stock, 555,374,922 shares outstanding	555,374,922	555,374,922
Common stock, no par value, no maximum authorization--1,308,762,703 shares issued	1,308,762,703	1,308,762,703
Common stock, no par value, no maximum authorization--1,158,082,750 shares outstanding	1,158,082,750	1,158,082,750
Treasury stock, at cost, 150,679,953 shares	150,679,953	150,679,953
Consolidated Trusts [Member]
ASSETS
Restricted cash (includes $25,865 and $27,515, respectively, related to consolidated trusts)	$ 25,865	$ 27,515
Investments in securities:
Available-for-sale, at fair value (includes $285 and $596, respectively, related to consolidated trusts)	285	596
Mortgage loans:
Accrued interest receivable, net (includes $6,974 and $7,169, respectively, related to consolidated trusts)	6,974	7,169
Liabilities:
Accrued interest payable (includes $8,194 and $8,282, respectively, related to consolidated trusts)	8,194	8,282
Debt at fair value	23,609	19,483
Other liabilities (includes $448 and $503, respectively, related to consolidated trusts)	448	503
Fannie Mae [Member]
Liabilities:
Debt at fair value	$ 11,133	$ 6,403