Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Assets:
Restricted cash (includes $29,302 and $25,865, respectively, related to consolidated trusts)	$ 33,873	$ 30,879
Investments in securities:
Trading, at fair value (includes $1,200 and $135, respectively, pledged as collateral)	1,200	135
Available-for-sale, at fair value (includes $80 and $285, respectively, related to consolidated trusts)	16,983	20,230
Accrued interest receivable (includes $7,246 and $6,974, respectively, related to consolidated trusts)	7,978	7,726
Mortgage loans:
Total loans held for investment (includes $13,714 and $14,075, respectively, at fair value)	13,714	14,075
Liabilities:
Accrued interest payable (includes $8,212 and $8,194, respectively, related to consolidated trusts)	9,909	9,794
Other liabilities (includes $408 and $448, respectively, related to consolidated trusts)	$ 9,903	$ 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 $29,302 and $25,865, respectively, related to consolidated trusts)	$ 29,302	$ 25,865
Investments in securities:
Available-for-sale, at fair value (includes $80 and $285, respectively, related to consolidated trusts)	80	285
Accrued interest receivable (includes $7,246 and $6,974, respectively, related to consolidated trusts)	7,246	6,974
Liabilities:
Accrued interest payable (includes $8,212 and $8,194, respectively, related to consolidated trusts)	8,212	8,194
Debt at fair value	28,563	23,609
Other liabilities (includes $408 and $448, respectively, related to consolidated trusts)	408	448
Fannie Mae [Member]
Liabilities:
Debt at fair value	$ 10,901	$ 11,133