Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions	6 Months Ended	12 Months Ended
Jun. 30, 2011	Dec. 31, 2010
Assets:
Cash and cash equivalents (includes $3 and $348, respectively, related to consolidated trusts)	$ 14,274	$ 17,297
Restricted cash (includes $33,136 and $59,619, respectively, related to consolidated trusts)	37,579	63,678
Federal funds sold and securities purchased under agreements to resell or similar arrangements	19,500	11,751
Investments in securities:
Trading, at fair value (includes $21 as of both periods related to consolidated trusts)	61,907	56,856
Available-for-sale, at fair value (includes $1,590 and $1,055, respectively, related to consolidated trusts)	86,616	94,392
Total investments in securities	148,523	151,248
Mortgage loans:
Loans held for sale, at lower of cost or fair value (includes $73 and $661, respectively, related to consolidated trusts)	439	915
Loans held for investment, at amortized cost (includes $3,084 and $2,962, respectively, at fair value and loans pledged as collateral that may be sold or repledged of $460 and $2,522, respectively, related to consolidated trusts)	2,996,896	2,984,361
Allowance for loan losses	(69,506)	(61,556)
Total loans held for investment, net of allowance	2,927,390	2,922,805
Total mortgage loans	2,927,829	2,923,720
Accrued interest receivable, net (includes $8,683 and $8,910, respectively, related to consolidated trusts)	10,681	11,279
Acquired property, net	13,592	16,173
Other assets (includes $59 and $593, respectively, related to consolidated trusts)	24,134	26,826
Total assets	3,196,112	3,221,972
Liabilities:
Accrued interest payable (includes $9,584 and $9,712, respectively, related to consolidated trusts)	13,289	13,764
Federal funds purchased and securities sold under agreements to repurchase		52
Other liabilities (includes $707 and $893, respectively, related to consolidated trusts)	13,065	13,673
Total liabilities	3,201,199	3,224,489
Commitments and contingencies (Note 14)
Fannie Mae stockholders' equity (deficit):
Senior preferred stock, 1,000,000 shares issued and outstanding	99,700	88,600
Preferred stock, 700,000,000 shares are authorized - 555,374,922 and 576,868,139 shares issued and outstanding, respectively	19,130	20,204
Common stock, no par value, no maximum authorization - 1,308,762,703 and 1,270,092,708 shares issued, respectively; 1,157,750,434 and 1,118,504,194 shares outstanding, respectively	687	667
Accumulated deficit	(115,784)	(102,986)
Accumulated other comprehensive loss	(1,499)	(1,682)
Treasury stock, at cost, 151,012,269 and 151,588,514 shares, respectively	(7,402)	(7,402)
Total Fannie Mae stockholders' deficit	(5,168)	(2,599)
Noncontrolling interest	81	82
Total deficit	(5,087)	(2,517)
Total liabilities and equity (deficit)	3,196,112	3,221,972
Of Fannie Mae [Member]
Mortgage loans:
Loans held for investment, at amortized cost (includes $3,084 and $2,962, respectively, at fair value and loans pledged as collateral that may be sold or repledged of $460 and $2,522, respectively, related to consolidated trusts)	386,356	407,228
Liabilities:
Debt (includes $862 and $893, respectively, of debt of Fannie Mae and $3,273 and $2,271, respectively, of debt of consolidated trust, at fair value)	724,799	780,044
Of Consolidated Trusts [Member]
Assets:
Cash and cash equivalents (includes $3 and $348, respectively, related to consolidated trusts)	3	348
Restricted cash (includes $33,136 and $59,619, respectively, related to consolidated trusts)	33,136	59,619
Investments in securities:
Trading, at fair value (includes $21 as of both periods related to consolidated trusts)	21	21
Available-for-sale, at fair value (includes $1,590 and $1,055, respectively, related to consolidated trusts)	1,590	1,055
Mortgage loans:
Loans held for sale, at lower of cost or fair value (includes $73 and $661, respectively, related to consolidated trusts)	73	661
Loans held for investment, at amortized cost (includes $3,084 and $2,962, respectively, at fair value and loans pledged as collateral that may be sold or repledged of $460 and $2,522, respectively, related to consolidated trusts)	2,610,540	2,577,133
Accrued interest receivable, net (includes $8,683 and $8,910, respectively, related to consolidated trusts)	8,683	8,910
Other assets (includes $59 and $593, respectively, related to consolidated trusts)	59	593
Liabilities:
Accrued interest payable (includes $9,584 and $9,712, respectively, related to consolidated trusts)	9,584	9,712
Debt (includes $862 and $893, respectively, of debt of Fannie Mae and $3,273 and $2,271, respectively, of debt of consolidated trust, at fair value)	2,450,046	2,416,956
Other liabilities (includes $707 and $893, respectively, related to consolidated trusts)	$ 707	$ 893

The balance represents total loans held for investment, at amortized cost, net of allowance for loan loss.

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-Paragraph 1
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Audit and Accounting Guide (AAG)
-Number AAG-BRD
-Chapter 4
-Paragraph 80
-Subparagraph Exhibit 4-8, 3
-IssueDate 2006-05-01

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 31
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

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- Definition

Total of all Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A3
-Appendix A

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

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Total of Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity including portions attributable to both the parent and noncontrolling interests (previously referred to as minority interest), if any. The entity including portions attributable to the parent and noncontrolling interests is sometimes referred to as the economic entity. This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 25

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 26

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A3
-Appendix A

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- Definition

This item represents debt securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition; this is the reason why the trading category of investments in debt securities are bought and sold "principally" for sale in the near term. Transfers into and out of the trading category should be rare. Such financial instruments that are held as of the reporting date are measured at fair value with unrealized holding gains and losses (the difference between fair value and the previously reported carrying amount) included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 29

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS115
-Paragraph 35

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph a

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- Definition

Value of common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury. Treasury stock is issued but is not outstanding. This stock has no voting rights and receives no dividends. Note that treasury stock may be recorded at its total cost or separately as par (or stated) value and additional paid in capital. Note: number of treasury shares concept is in another section within stockholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Technical Bulletin (FTB)
-Number 85-6
-Paragraph 3

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