Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 20,674		$ 17,539
Restricted cash (includes $54,750 and $45,900, respectively, related to consolidated trusts)	59,944		50,797
Federal funds sold and securities purchased under agreements to resell or similar arrangements	45,500		46,000
Investments in securities:
Trading, at fair value	42,522		74,198
Available-for-sale, at fair value (includes $1,042 and $1,191, respectively, related to consolidated trusts)	66,352		77,582
Total investments in securities	108,874		151,780
Mortgage loans:
Loans held for sale, at lower of cost or fair value (includes $95 and $66, respectively, related to consolidated trusts)	490		311
Loans held for investment, at amortized cost (includes $7,840 and $3,611, respectively, at fair value and loans pledged as collateral that may be sold or repledged of $1,040 and $798, respectively, related to consolidated trusts)	3,005,418		2,970,466
Allowance for loan losses	(63,012)	[1],[2]	(72,156)
Total loans held for investment, net of allowance	2,942,406		2,898,310
Total mortgage loans	2,942,896		2,898,621
Accrued interest receivable, net (includes $8,358 and $8,466, respectively, related to consolidated trusts)	9,963		10,000
Acquired property, net	10,278		11,373
Other assets (includes cash pledged as collateral of $2,038 and $1,109, respectively)	28,121		25,374
Total assets	3,226,250		3,211,484
Liabilities:
Accrued interest payable (includes $8,856 and $9,302, respectively, related to consolidated trusts)	11,732		12,648
Other liabilities (includes $715 and $629, respectively, related to consolidated trusts)	15,396		13,535
Total liabilities	3,223,838		3,216,055
Commitments and contingencies (Note 13)
Fannie Mae stockholders' equity (deficit):
Senior preferred stock, 1,000,000 shares issued and outstanding	117,149		112,578
Preferred stock, 700,000,000 shares are authorized—555,374,922 shares issued and outstanding, respectively	19,130		19,130
Common stock, no par value, no maximum authorization— 1,308,762,703 shares issued, respectively, 1,158,077,970 and 1,157,767,400 shares outstanding, respectively	687		687
Accumulated deficit	(127,407)		(128,381)
Accumulated other comprehensive income (loss)	201		(1,235)
Treasury stock, at cost, 150,684,733 and 150,995,303 shares, respectively	(7,401)		(7,403)
Total Fannie Mae stockholders' equity (deficit)	2,359		(4,624)
Noncontrolling interest	53		53
Total equity (deficit)	2,412		(4,571)
Total liabilities and equity (deficit)	3,226,250		3,211,484
Fannie Mae [Member]
Mortgage loans:
Loans held for investment, at amortized cost (includes $7,840 and $3,611, respectively, at fair value and loans pledged as collateral that may be sold or repledged of $1,040 and $798, respectively, related to consolidated trusts)	363,064		380,134
Allowance for loan losses	(54,214)		(57,309)
Total mortgage loans	309,245		323,070
Liabilities:
Debt (includes $830 and $838, respectively, of debt of Fannie Mae and $7,368 and $3,939, respectively, of debt of consolidated trusts, at fair value)	652,971		732,444
Consolidated Trusts [Member]
ASSETS
Restricted cash (includes $54,750 and $45,900, respectively, related to consolidated trusts)	54,750		45,900
Investments in securities:
Available-for-sale, at fair value (includes $1,042 and $1,191, respectively, related to consolidated trusts)	1,042		1,191
Mortgage loans:
Loans held for sale, at lower of cost or fair value (includes $95 and $66, respectively, related to consolidated trusts)	95		66
Loans held for investment, at amortized cost (includes $7,840 and $3,611, respectively, at fair value and loans pledged as collateral that may be sold or repledged of $1,040 and $798, respectively, related to consolidated trusts)	2,642,354		2,590,332
Allowance for loan losses	(8,798)		(14,847)
Total mortgage loans	2,633,651		2,575,551
Accrued interest receivable, net (includes $8,358 and $8,466, respectively, related to consolidated trusts)	8,358		8,466
Liabilities:
Accrued interest payable (includes $8,856 and $9,302, respectively, related to consolidated trusts)	8,856		9,302
Debt (includes $830 and $838, respectively, of debt of Fannie Mae and $7,368 and $3,939, respectively, of debt of consolidated trusts, at fair value)	2,543,739		2,457,428
Other liabilities (includes $715 and $629, respectively, related to consolidated trusts)	$ 715		$ 629

[1] Total allowance for loan losses includes $376 million and $334 million as of September 30, 2012 and 2011, respectively, for acquired credit-impaired loans.

[2] As of September 30, 2012, we began classifying as TDRs loans to certain borrowers who have received bankruptcy relief. These loans had a recorded investment of $22.9 billion and a related allowance of $1.1 billion as of September 30, 2012.