Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Assets:
Restricted cash (includes $25,809 and $27,515, respectively, related to consolidated trusts)	$ 30,281	$ 32,542
Investments in securities:
Available-for-sale, at fair value (includes $351 and $596, respectively, related to consolidated trusts)	22,007	30,654
Mortgage loans:
Mortgage loans held for investment, at fair value	14,605	15,629
Accrued interest receivable, net (includes $7,371 and $7,169, respectively, related to consolidated trusts)	8,137	8,193
Liabilities:
Accrued interest payable (includes $8,156 and $8,282, respectively, related to consolidated trusts)	10,016	10,232
Other liabilities (includes $426 and $503, respectively, related to consolidated trusts)	$ 10,400	$ 12,019
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 $25,809 and $27,515, respectively, related to consolidated trusts)	$ 25,809	$ 27,515
Investments in securities:
Available-for-sale, at fair value (includes $351 and $596, respectively, related to consolidated trusts)	351	596
Mortgage loans:
Accrued interest receivable, net (includes $7,371 and $7,169, respectively, related to consolidated trusts)	7,371	7,169
Liabilities:
Accrued interest payable (includes $8,156 and $8,282, respectively, related to consolidated trusts)	8,156	8,282
Debt at fair value	23,143	19,483
Other liabilities (includes $426 and $503, respectively, related to consolidated trusts)	426	503
Fannie Mae [Member]
Liabilities:
Debt at fair value	$ 9,975	$ 6,403