Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Assets:
Restricted cash (includes $37,856 and $25,865, respectively, related to consolidated trusts)	$ 42,926	$ 30,879
Investments in securities:
Trading, at fair value (includes $1,191 and $135, respectively, pledged as collateral)	1,191	135
Available-for-sale, at fair value (includes $110 and $285, respectively, related to consolidated trusts)	9,865	20,230
Accrued interest receivable (includes $7,032 and $6,974, respectively, related to consolidated trusts)	7,728	7,726
Mortgage loans:
Total loans held for investment (includes $12,914 and $14,075, respectively, at fair value)	12,914	14,075
Liabilities:
Accrued interest payable (includes $8,199 and $8,194, respectively, related to consolidated trusts)	9,512	9,794
Other liabilities (includes $392 and $448, respectively, related to consolidated trusts)	$ 9,141	$ 10,393
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, 1,308,762,703 shares issued	1,308,762,703	1,308,762,703
Common stock, 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 $37,856 and $25,865, respectively, related to consolidated trusts)	$ 37,856	$ 25,865
Investments in securities:
Available-for-sale, at fair value (includes $110 and $285, respectively, related to consolidated trusts)	110	285
Accrued interest receivable (includes $7,032 and $6,974, respectively, related to consolidated trusts)	7,032	6,974
Liabilities:
Accrued interest payable (includes $8,199 and $8,194, respectively, related to consolidated trusts)	8,199	8,194
Debt at fair value	35,453	23,609
Other liabilities (includes $392 and $448, respectively, related to consolidated trusts)	392	448
Fannie Mae [Member]
Liabilities:
Debt at fair value	$ 10,460	$ 11,133