Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Restricted cash (includes $31,536 and $25,865, respectively, related to consolidated trusts)	$ 36,953	$ 30,879
Investments in securities:
Trading, at fair value (includes $1,277 and $135, respectively, pledged as collateral)	1,277	135
Available-for-sale, at fair value (includes $107 and $285, respectively, related to consolidated trusts)	8,363	20,230
Mortgage loans:
Loans held for investment, at amortized cost of consolidated trusts (includes $12,057 and $14,075, respectively, at fair value)	12,057	14,075
Accrued interest receivable, net (includes $7,064 and $6,974, respectively, related to consolidated trusts)	7,737	7,726
Liabilities:
Accrued interest payable (includes $8,285 and $8,194, respectively, related to consolidated trusts)	9,431	9,794
Other liabilities (includes $390 and $448, respectively, related to consolidated trusts)	$ 10,150	$ 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, 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 $31,536 and $25,865, respectively, related to consolidated trusts)	$ 31,536	$ 25,865
Investments in securities:
Available-for-sale, at fair value (includes $107 and $285, respectively, related to consolidated trusts)	107	285
Mortgage loans:
Accrued interest receivable, net (includes $7,064 and $6,974, respectively, related to consolidated trusts)	7,064	6,974
Liabilities:
Accrued interest payable (includes $8,285 and $8,194, respectively, related to consolidated trusts)	8,285	8,194
Debt at fair value	36,524	23,609
Other liabilities (includes $390 and $448, respectively, related to consolidated trusts)	390	448
Fannie Mae [Member]
Liabilities:
Debt at fair value	$ 9,582	$ 11,133