Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
ASSETS
Restricted cash (includes $25,401 and $23,982, respectively, related to consolidated trusts)	$ 29,587	$ 28,995
Investments in securities:
Available-for-sale, at fair value (includes $561 and $998, respectively, related to consolidated trusts)	34,026	38,171
Mortgage loans:
Loans held for sale, at lower of cost or fair value (includes $25 and $31, respectively, related to consolidated trusts)	625	380
Accrued interest receivable, net (includes $7,470 and $7,271, respectively, related to consolidated trusts)	8,472	8,319
Other assets (includes cash pledged as collateral of $1,821 and $1,590, respectively)	1,821	1,590
Liabilities:
Accrued interest payable (includes $8,213 and $8,276, respectively, related to consolidated trusts)	10,203	10,553
Other liabilities (includes $453 and $488, respectively, related to consolidated trusts)	12,957	15,441
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—1,158,080,657 shares outstanding	1,158,080,657	1,158,080,657
Treasury stock, at cost, 150,682,046 shares	150,682,046	150,682,046
Commitments and contingencies (Note 17)	0	0
Fannie Mae [Member]
Liabilities:
Debt at fair value	3,432	1,308
Consolidated Trusts [Member]
ASSETS
Restricted cash (includes $25,401 and $23,982, respectively, related to consolidated trusts)	25,401	23,982
Investments in securities:
Available-for-sale, at fair value (includes $561 and $998, respectively, related to consolidated trusts)	561	998
Mortgage loans:
Loans held for sale, at lower of cost or fair value (includes $25 and $31, respectively, related to consolidated trusts)	25	31
Mortgage loans held for investment, at fair value	15,116	14,268
Loans pledged as collateral that may be sold or repledged included in loans held for investment, at amortized cost	389	442
Accrued interest receivable, net (includes $7,470 and $7,271, respectively, related to consolidated trusts)	7,470	7,271
Liabilities:
Accrued interest payable (includes $8,213 and $8,276, respectively, related to consolidated trusts)	8,213	8,276
Debt at fair value	16,420	14,976
Other liabilities (includes $453 and $488, respectively, related to consolidated trusts)	$ 453	$ 488