Federal Home Loan Mortgage (FMCC) 10-K 19 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Billions, except Share data, unless otherwise specified	Dec. 31, 2014	Feb. 05, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	FEDERAL HOME LOAN MORTGAGE CORP
Entity Central Index Key	1026214
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$2.50
Entity Common Stock, Shares Outstanding		650,043,899

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income
Total mortgage loans	$63,605	$64,883	$74,049
Investments in securities	5,843	7,768	10,583
Other	32	51	86
Total interest income	69,480	72,702	84,718
Interest expense
Total interest expense	-54,916	-55,779	-66,502
Expense related to derivatives	-301	-455	-605
Net interest income	14,263	16,468	17,611
(Provision) benefit for credit losses	-58	2,465	-1,890
Net interest income after (provision) benefit for credit losses	14,205	18,933	15,721
Non-interest income (loss)
Gains (losses) on extinguishment of debt securities of consolidated trusts and other debt	-422	446	-135
Derivative gains (losses)	-8,291	2,632	-2,448
Impairment of available-for-sale securities:
Total other-than-temporary impairment of available-for-sale securities	-860	-763	-1,236
Portion of other-than-temporary impairment recognized in AOCI	78	747	932
Net impairment of available-for-sale securities recognized in earnings	-938	-1,510	-2,168
Other gains (losses) on investment securities recognized in earnings	1,494	301	-1,522
Other income (loss)	8,044	6,650	2,190
Non-interest income (loss)	-113	8,519	-4,083
Non-interest expense
Salaries and employee benefits	-914	-833	-810
Professional services	-527	-543	-361
Occupancy expense	-58	-54	-57
Other administrative expense	-382	-375	-333
Total administrative expense	-1,881	-1,805	-1,561
Real estate owned operations (expense) income	-196	140	-59
Temporary Payroll Tax Cut Continuation Act of 2011 expense	-775	-533	-108
Other (expense) income	-238	109	-465
Non-interest expense	-3,090	-2,089	-2,193
Income before income tax (expense) benefit	11,002	25,363	9,445
Income tax (expense) benefit	-3,312	23,305	1,537
Net income	7,690	48,668	10,982
Other comprehensive income (loss), net of taxes and reclassification adjustments:
Changes in unrealized gains (losses) related to available-for-sale securities	1,584	2,406	4,769
Changes in unrealized gains (losses) related to cash flow hedge relationships	197	316	414
Changes in defined benefit plans	-45	210	-126
Total other comprehensive income (loss), net of taxes and reclassification adjustments	1,736	2,932	5,057
Comprehensive income	9,426	51,600	16,039
Net income	7,690	48,668	10,982
Undistributed net worth sweep and senior preferred stock dividends	-10,026	-52,199	-13,056
Net income (loss) attributable to common stockholders	-2,336	-3,531	-2,074
Net income (loss) per common share — basic and diluted	($0.72)	($1.09)	($0.64)
Weighted average common shares outstanding (in millions) — basic and diluted	3,236	3,238	3,240
Variable Interest Entity Primary Beneficiary
Interest income
Total mortgage loans	57,036	57,189	65,089
Interest expense
Total interest expense	-48,003	-47,350	-56,109
Non-interest income (loss)
Gains (losses) on extinguishment of debt securities of consolidated trusts and other debt	-451	314	-58
Freddie Mac parent
Interest income
Total mortgage loans	6,569	7,694	8,960
Interest expense
Interest expense, short-term debt	-145	-178	-176
Interest expense, long-term debt	-6,768	-8,251	-10,217
Non-interest income (loss)
Gains (losses) on extinguishment of debt securities of consolidated trusts and other debt	$29	$132	($77)

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets
Cash and cash equivalents (includes $2 and $1, respectively, related to our consolidated VIEs)	$10,928	$11,281
Restricted cash and cash equivalents (includes $8,532 and $12,193, respectively, related to our consolidated VIEs)	8,535	12,265
Federal funds sold and securities purchased under agreements to resell (includes $13,500 and $3,150, respectively, related to our consolidated VIEs)	51,903	62,383
Investments in securities:
Available-for-sale, at fair value (includes $9 and $70, respectively, pledged as collateral that may be repledged)	106,550	128,919
Trading, at fair value (includes $1,884 and $365, respectively, pledged as collateral that may be repledged)	30,437	23,404
Total investments in securities	136,987	152,323
Held-for-investment, at amortized cost:
Total held-for-investment mortgage loans, net	1,688,212	1,676,063
Held-for-sale, at lower-of-cost-or-fair-value (includes $12,130 and $8,727 at fair value, respectively)	12,368	8,727
Total mortgage loans, net	1,700,580	1,684,790
Accrued interest receivable (includes $5,124 and $5,111, respectively, related to our consolidated VIEs)	6,034	6,150
Derivative assets, net	822	1,063
Real estate owned, net (includes $44 and $49, respectively, related to our consolidated VIEs)	2,558	4,551
Deferred tax assets, net	19,498	22,716
Other assets (Note 19) (includes $2,596 and $2,172, respectively, related to our consolidated VIEs)	7,694	8,539
Total assets	1,945,539	1,966,061
Liabilities
Accrued interest payable (includes $4,702 and $4,702, respectively, related to our consolidated VIEs)	6,325	6,803
Debt, net:
Total debt, net	1,929,542	1,940,751
Derivative liabilities, net	1,963	180
Other liabilities (Note 19) (includes $1 and $6, respectively, related to our consolidated VIEs)	5,058	5,492
Total liabilities	1,942,888	1,953,226
Commitments and contingencies (Notes 9, 14, and 17)
Equity
Senior preferred stock, at redemption value	72,336	72,336
Preferred stock, at redemption value	14,109	14,109
Common stock, $0.00 par value, 4,000,000,000 shares authorized, 725,863,886 shares issued and 650,043,899 shares and 650,039,533 shares outstanding, respectively	0	0
Additional paid-in capital	0	0
Retained earnings (accumulated deficit)	-81,639	-69,719
AOCI, net of taxes, related to:
Available-for-sale securities (includes $839 and ($1,100), respectively, related to net unrealized gains (losses) on securities for which other-than-temporary impairment has been recognized in earnings)	2,546	962
Cash flow hedge relationships	-803	-1,000
Defined benefit plans	-13	32
Total AOCI, net of taxes	1,730	-6
Treasury stock, at cost, 75,819,987 shares and 75,824,353 shares, respectively	-3,885	-3,885
Total equity (See NOTE 11: STOCKHOLDERS’ EQUITY for information on our dividend obligation to Treasury)	2,651	12,835
Total liabilities and equity	1,945,539	1,966,061
Variable Interest Entity Primary Beneficiary
Assets
Cash and cash equivalents (includes $2 and $1, respectively, related to our consolidated VIEs)	2	1
Restricted cash and cash equivalents (includes $8,532 and $12,193, respectively, related to our consolidated VIEs)	8,532	12,193
Federal funds sold and securities purchased under agreements to resell (includes $13,500 and $3,150, respectively, related to our consolidated VIEs)	13,500	3,150
Held-for-investment, at amortized cost:
Total held-for-investment mortgage loans, net	1,558,094	1,529,905
Held-for-sale, at lower-of-cost-or-fair-value (includes $12,130 and $8,727 at fair value, respectively)	0	0
Total mortgage loans, net	1,558,094	1,529,905
Accrued interest receivable (includes $5,124 and $5,111, respectively, related to our consolidated VIEs)	5,124	5,111
Real estate owned, net (includes $44 and $49, respectively, related to our consolidated VIEs)	44	49
Other assets (Note 19) (includes $2,596 and $2,172, respectively, related to our consolidated VIEs)	2,596	2,172
Liabilities
Accrued interest payable (includes $4,702 and $4,702, respectively, related to our consolidated VIEs)	4,702	4,702
Debt, net:
Total debt, net	1,479,473	1,433,984
Other liabilities (Note 19) (includes $1 and $6, respectively, related to our consolidated VIEs)	1	6
Freddie Mac parent
Held-for-investment, at amortized cost:
Total held-for-investment mortgage loans, net	130,118	146,158
Held-for-sale, at lower-of-cost-or-fair-value (includes $12,130 and $8,727 at fair value, respectively)	12,368	8,727
Total mortgage loans, net	142,486	154,885
Debt, net:
Total debt, net	$450,069	$506,767

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Assets
Cash and cash equivalents related to consolidated VIEs	$10,928	$11,281
Restricted cash and cash equivalents related to consolidated VIEs	8,535	12,265
Federal funds sold and securities purchased under agreements to resell related to consolidated VIEs	51,903	62,383
Investments in securities:
Available-for-sale securities pledged as collateral that may be repledged	9	70
Trading securities pledged as collateral that may be repledged	1,884	365
Mortgage loans:
Allowance for loan losses, held-for-investment mortgage loans	21,761	24,618
Mortgage loans, held for sale, at fair value	12,130	8,727
Accrued interest receivable related to consolidated VIEs	6,034	6,150
Real estate owned, net related to consolidated VIEs	2,558	4,551
Other assets related to consolidated VIEs	7,694	8,539
Liabilities
Accrued interest payable related to consolidated VIEs	6,325	6,803
Other liabilities related to consolidated VIEs	5,058	5,492
Equity
Common stock, par value	$0	$0
Common stock, shares authorized	4,000,000,000	4,000,000,000
Common stock, shares issued	725,863,886	725,863,886
Common stock, shares outstanding	650,043,899	650,039,533
AOCI, net of taxes, related to:
Available for sale securities other-than-temporary impairment adjustment, related to net unrealized gains(losses) on securities for which other-than-temporary impairment has been recognized in earnings	839	-1,100
Treasury stock, shares	75,819,987	75,824,353
Variable Interest Entity Primary Beneficiary
Assets
Cash and cash equivalents related to consolidated VIEs	2	1
Restricted cash and cash equivalents related to consolidated VIEs	8,532	12,193
Federal funds sold and securities purchased under agreements to resell related to consolidated VIEs	13,500	3,150
Mortgage loans:
Allowance for loan losses, held-for-investment mortgage loans	2,884	3,006
Accrued interest receivable related to consolidated VIEs	5,124	5,111
Real estate owned, net related to consolidated VIEs	44	49
Other assets related to consolidated VIEs	2,596	2,172
Liabilities
Accrued interest payable related to consolidated VIEs	4,702	4,702
Debt securities recorded at fair value	42	59
Other liabilities related to consolidated VIEs	1	6
Freddie Mac parent
Mortgage loans:
Allowance for loan losses, held-for-investment mortgage loans	18,877	21,612
Liabilities
Debt securities recorded at fair value	$5,820	$2,683

Consolidated_Statements_of_Equ

Consolidated Statements of Equity (USD $)	Total	Senior Preferred Stock, at Redemption Value	Preferred Stock, at Redemption Value	Common Stock, at Par Value	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	AOCI, Net of Tax	Treasury Stock, at Cost
Share data in Millions, unless otherwise specified
Beginning balance at Dec. 31, 2011	($146,000,000)	$72,171,000,000	$14,109,000,000	$0	$3,000,000	($74,525,000,000)	($7,995,000,000)	($3,909,000,000)
Beginning balance, Shares at Dec. 31, 2011		1	464	650
Comprehensive income:
Net income	10,982,000,000					10,982,000,000
Other comprehensive income, net of taxes	5,057,000,000						5,057,000,000
Comprehensive income	16,039,000,000					10,982,000,000	5,057,000,000
Increase in liquidation preference	165,000,000	165,000,000
Stock-based compensation	2,000,000				2,000,000
Income tax benefit from stock-based compensation	1,000,000				1,000,000
Common stock issuances	0				-24,000,000			24,000,000
Transfer From Retained Earnings Accumulated Deficit To Additional Paid In Capital	0				19,000,000	-19,000,000
Senior Preferred Stock Dividends Declared	-7,233,000,000					-7,233,000,000
Dividend equivalent payments on expired stock options	-1,000,000					-1,000,000
Ending balance at Dec. 31, 2012	8,827,000,000	72,336,000,000	14,109,000,000	0	1,000,000	-70,796,000,000	-2,938,000,000	-3,885,000,000
Ending balance, Shares at Dec. 31, 2012		1	464	650
Comprehensive income:
Net income	48,668,000,000					48,668,000,000
Other comprehensive income, net of taxes	2,932,000,000						2,932,000,000
Comprehensive income	51,600,000,000					48,668,000,000	2,932,000,000
Common stock issuances	-1,000,000				-1,000,000
Senior Preferred Stock Dividends Declared	-47,591,000,000					-47,591,000,000
Ending balance at Dec. 31, 2013	12,835,000,000	72,336,000,000	14,109,000,000	0	0	-69,719,000,000	-6,000,000	-3,885,000,000
Ending balance, Shares at Dec. 31, 2013		1	464	650
Comprehensive income:
Net income	7,690,000,000					7,690,000,000
Other comprehensive income, net of taxes	1,736,000,000						1,736,000,000
Comprehensive income	9,426,000,000					7,690,000,000	1,736,000,000
Increase in liquidation preference	0
Senior Preferred Stock Dividends Declared	-19,610,000,000					-19,610,000,000
Ending balance at Dec. 31, 2014	$2,651,000,000	$72,336,000,000	$14,109,000,000	$0	$0	($81,639,000,000)	$1,730,000,000	($3,885,000,000)
Ending balance, Shares at Dec. 31, 2014		1	464	650

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income	$7,690,000,000	$48,668,000,000	$10,982,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Derivative losses (gains)	5,652,000,000	-6,097,000,000	-1,350,000,000
Asset related amortization — premiums, discounts, and basis adjustments	3,518,000,000	4,627,000,000	4,624,000,000
Debt related amortization — premiums and discounts on certain debt securities and basis adjustments	-5,368,000,000	-6,779,000,000	-5,782,000,000
Losses (gains) on extinguishment of debt securities of consolidated trusts and other debt	422,000,000	-446,000,000	135,000,000
Provision (benefit) for credit losses	58,000,000	-2,465,000,000	1,890,000,000
(Gains) losses on investment activity	-1,287,000,000	1,545,000,000	2,680,000,000
Deferred income tax expense (benefit)	2,284,000,000	-23,422,000,000	3,000,000
Purchases of held-for-sale mortgage loans	-24,593,000,000	-23,103,000,000	-25,340,000,000
Sales of mortgage loans acquired as held-for-sale	21,995,000,000	28,123,000,000	21,764,000,000
Repayments of mortgage loans acquired as held-for-sale	67,000,000	167,000,000	59,000,000
Payments to servicers for pre-foreclosure expense and servicer incentive fees	-932,000,000	-1,302,000,000	-1,269,000,000
Change in:
Accrued interest receivable	116,000,000	725,000,000	1,187,000,000
Accrued interest payable	-440,000,000	-849,000,000	-1,094,000,000
Income taxes receivable	268,000,000	117,000,000	-1,523,000,000
Other, net	-565,000,000	-2,957,000,000	-1,722,000,000
Net cash provided by operating activities	8,885,000,000	16,552,000,000	5,244,000,000
Cash flows from investing activities
Purchases of trading securities	-42,477,000,000	-53,753,000,000	-33,880,000,000
Proceeds from sales of trading securities	18,513,000,000	57,380,000,000	17,641,000,000
Proceeds from maturities of trading securities	17,118,000,000	12,542,000,000	31,106,000,000
Purchases of available-for-sale securities	-25,290,000,000	-9,681,000,000	-3,252,000,000
Proceeds from sales of available-for-sale securities	32,062,000,000	24,675,000,000	1,729,000,000
Proceeds from maturities of available-for-sale securities	20,734,000,000	33,630,000,000	38,517,000,000
Purchases of held-for-investment mortgage loans	-75,298,000,000	-79,028,000,000	-79,492,000,000
Proceeds from sales of mortgage loans acquired as held-for-investment	454,000,000	196,000,000	5,000,000
Repayments of mortgage loans acquired as held-for-investment	241,552,000,000	410,455,000,000	522,242,000,000
Decrease in restricted cash	3,730,000,000	2,327,000,000	13,471,000,000
Net proceeds from dispositions of real estate owned and other recoveries	7,712,000,000	11,274,000,000	11,265,000,000
Net decrease (increase) in federal funds sold and securities purchased under agreements to resell	10,480,000,000	-24,820,000,000	-25,519,000,000
Derivative premiums and terminations and swap collateral, net	-3,888,000,000	6,062,000,000	569,000,000
Other investing activities, net	-134,000,000	0	0
Net cash provided by investing activities	205,268,000,000	391,259,000,000	494,402,000,000
Cash flows from financing activities
Increase in liquidation preference of senior preferred stock	0	0	165,000,000
Payment of cash dividends on senior preferred stock	-19,610,000,000	-47,591,000,000	-7,233,000,000
Other financing activities, net	-7,000,000	-7,000,000	-12,000,000
Net cash used in financing activities	-214,506,000,000	-405,043,000,000	-519,575,000,000
Net (decrease) increase in cash and cash equivalents	-353,000,000	2,768,000,000	-19,929,000,000
Cash and cash equivalents at beginning of year	11,281,000,000	8,513,000,000	28,442,000,000
Cash and cash equivalents at end of year	10,928,000,000	11,281,000,000	8,513,000,000
Cash paid (received) for:
Debt interest	62,257,000,000	65,614,000,000	75,328,000,000
Net cash settlement on interest rate swaps	2,537,000,000	3,701,000,000	4,044,000,000
Income taxes	760,000,000	0	-18,000,000
Parent Company [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Losses (gains) on extinguishment of debt securities of consolidated trusts and other debt	-29,000,000	-132,000,000	77,000,000
Cash flows from financing activities
Proceeds from issuance of debt	451,854,000,000	701,342,000,000	718,731,000,000
Repayments of debt	-508,710,000,000	-742,510,000,000	-832,552,000,000
Variable Interest Entity Primary Beneficiary Member
Adjustments to reconcile net income to net cash provided by operating activities:
Losses (gains) on extinguishment of debt securities of consolidated trusts and other debt	451,000,000	-314,000,000	58,000,000
Cash flows from financing activities
Proceeds from issuance of debt	124,887,000,000	113,841,000,000	95,601,000,000
Repayments of debt	-262,920,000,000	-430,118,000,000	-494,275,000,000
Cash and cash equivalents at beginning of year	1,000,000
Cash and cash equivalents at end of year	$2,000,000	$1,000,000

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Freddie Mac is a GSE chartered by Congress in 1970. Our public mission is to provide liquidity, stability, and affordability to the U.S. housing market. We are regulated by FHFA, the SEC, HUD, the CFPB and Treasury, and are currently operating under the conservatorship of FHFA. For more information on the roles of FHFA and Treasury, see “NOTE 2: CONSERVATORSHIP AND RELATED MATTERS.”
	We perform our mission by participating in the secondary mortgage market. Our participation in the secondary mortgage market includes providing our credit guarantee for mortgages originated by mortgage lenders in the primary mortgage market and investing in mortgage loans and mortgage-related securities. We do not participate directly in the primary mortgage market.
	We have three reportable segments, which are based on the type of business activities each performs — Single-family Guarantee, Investments, and Multifamily. Our Single-family Guarantee segment reflects results from our single-family credit guarantee activities. In our Single-family Guarantee segment, we purchase and guarantee single-family mortgage loans originated by our seller/servicers in the primary mortgage market and we manage our seriously delinquent loans. In most instances, we use the mortgage securitization process to package the loans into guaranteed mortgage-related securities. We guarantee the payment of principal and interest on the mortgage-related securities in exchange for management and guarantee fees. Our Investments segment reflects results from three primary activities: (a) managing the company’s mortgage-related investments portfolio, excluding Multifamily segment investments and single-family seriously delinquent loans; (b) managing the treasury function for the entire company, including funding and liquidity; and (c) managing interest-rate risk for the entire company. In our Investments segment, we invest principally in mortgage-related securities and single-family performing mortgage loans. Our Multifamily segment reflects results from our investment (both purchases and sales), securitization, and guarantee activities in multifamily mortgage loans and securities. In our Multifamily segment, our primary business model is to purchase multifamily mortgage loans for aggregation and then securitization through issuance of multifamily K Certificates. See “NOTE 13: SEGMENT REPORTING” for additional information.
	Our primary business objectives are: (a) to support U.S. homeowners and renters by maintaining mortgage availability even when other sources of financing are scarce and by providing struggling homeowners with alternatives that allow them to stay in their homes or avoid foreclosure; (b) to reduce taxpayer exposure to losses by increasing the role of private capital in the mortgage market and reducing our overall risk profile; (c) to build a commercially strong and efficient business enterprise to succeed in a to-be-determined “future state;" and (d) to support and improve the secondary mortgage market. For information regarding our objectives, see “NOTE 2: CONSERVATORSHIP AND RELATED MATTERS — Business Objectives.”
	Throughout our consolidated financial statements and related notes, we use certain acronyms and terms which are defined in the “GLOSSARY.”
	Basis of Presentation
	The accompanying consolidated financial statements have been prepared in accordance with GAAP and include our accounts as well as the accounts of other entities in which we have a controlling financial interest. All intercompany balances and transactions have been eliminated.
	Our current accounting policies are described below. We are operating under the basis that we will realize assets and satisfy liabilities in the normal course of business as a going concern and in accordance with the delegation of authority from FHFA to our Board of Directors and management. Certain amounts in prior periods’ consolidated financial statements have been reclassified to conform to the current presentation.
	We evaluate the materiality of identified errors in the financial statements using both an income statement, or “rollover,” and a balance sheet, or “iron curtain,” approach, based on relevant quantitative and qualitative factors. Net income includes certain adjustments to correct immaterial errors related to previously reported periods.
	Beginning in the first quarter of 2014, we reclassified net discounts paid on retirements of other debt and net premiums received from issuance of debt securities of consolidated trusts and other debt from cash flows from operating activities to cash flows from financing activities on our consolidated statements of cash flows. This reclassification resulted in a decrease of $2.0 billion and $3.2 billion to net cash provided by operating activities, and an increase of $2.0 billion and $3.2 billion to net cash used in financing activities for 2013 and 2012, respectively.
	Use of Estimates
	The preparation of financial statements requires us to make estimates and assumptions that affect: (a) the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements; and (b) the reported amounts of revenues and expenses and gains and losses during the reporting period. Management has made significant estimates in preparing the financial statements for establishing the allowance for loan losses and reserve for guarantee losses, valuing financial instruments and other assets and liabilities, assessing impairments on investments, and assessing our ability to realize net deferred tax assets. Actual results could be different from these estimates.
	Consolidation and Equity Method of Accounting
	The consolidated financial statements include our accounts and those of our subsidiaries. We consolidate entities in which we have a controlling financial interest. All intercompany transactions have been eliminated in consolidation.
	For each entity with which we are involved, we determine whether the entity should be consolidated in our financial statements. The method for determining whether a controlling financial interest exists varies depending on whether the entity is a VIE or non-VIE. A VIE is an entity: (a) that has a total equity investment at risk that is not sufficient to finance its activities without additional subordinated financial support provided by another party; (b) where the group of equity holders does not have: (i) the power, through voting rights or similar rights, to direct the activities of an entity that most significantly impact the entity’s economic performance; (ii) the obligation to absorb the entity’s expected losses; or (iii) the right to receive the entity’s expected residual returns; or (c) where the voting rights of some investors are disproportionate to their obligation to absorb expected losses or their right to expected residual returns (or both) and substantially all of the entity’s activities are conducted on behalf of an investor that has disproportionately few voting rights.
	We consolidate VIEs in which we hold a controlling financial interest and are therefore deemed to be the primary beneficiary. An enterprise has a controlling financial interest in, and thus is deemed to be the primary beneficiary of, a VIE if it has both: (a) the power to direct the activities of the VIE that most significantly impact its economic performance; and (b) exposure to losses or benefits of the VIE that could potentially be significant to the VIE. We perform ongoing assessments to determine if we are the primary beneficiary of the VIEs with which we are involved and, as such, conclusions may change over time as the nature and extent of our involvement changes.
	We use securitization trusts, which are VIEs, in our securities issuance process. We are the primary beneficiary of trusts that issue our single-family PCs and certain Other Guarantee Transactions. See “NOTE 3: VARIABLE INTEREST ENTITIES” for more information. When we transfer assets into a VIE that we consolidate at the time of the transfer (or shortly thereafter), we recognize the assets and liabilities of the VIE at the amounts that they would have been recognized if they had not been transferred, and no gain or loss is recognized on these transfers. For all other VIEs that we consolidate, we recognize the assets and liabilities of the VIE at fair value, and we recognize a gain or loss for the difference between: (a) the sum of the fair value of the consideration paid, the fair value of any noncontrolling interests held by third parties and the reported amount of any previously held interests; and (b) the net amount, measured on a fair value basis, of the assets and liabilities consolidated.
	For entities that are not VIEs, the usual condition of a controlling financial interest is ownership of a majority voting interest in an entity. We use the equity method of accounting for entities over which we have the ability to exercise significant influence, but not control.
	Fair Value Measurements
	Consistent with the accounting guidance for fair value measurements and disclosures, we use a three-level fair value hierarchy that prioritizes the inputs to the valuation techniques used to measure the fair value of assets and liabilities, giving highest priority to quoted prices in active markets and lowest priority to unobservable inputs. Fair value represents the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements under this hierarchy are distinguished among three levels: quoted market prices, observable inputs, and unobservable inputs. We use quoted market prices and valuation techniques that seek to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs. Our inputs are based on the assumptions a market participant would use in valuing the asset or liability. Assets and liabilities are classified in their entirety within the fair value hierarchy based on the lowest level input that is significant to the fair value measurement. When assets and liabilities are transferred between levels, we recognize the transfer as of the beginning of the period. See “NOTE 16: FAIR VALUE DISCLOSURES” for additional information regarding the fair value measurements and the hierarchy.
	Securitization Activities through Issuances of Freddie Mac Mortgage-Related Securities
	Overview
	When we securitize mortgages that we purchase, we issue mortgage-related securities such as PCs that can be sold to investors or held by us. We issue mortgage-related securities in the form of PCs, REMICs and Other Structured Securities, and Other Guarantee Transactions. Guarantor swaps are transactions where financial institutions exchange mortgage loans for PCs backed by these mortgage loans. Multilender swaps are similar to guarantor swaps, except that the formed PC pools include loans that are contributed by more than one party. We issue PCs through various swap-based exchanges significantly more often than through cash-based transfers. We issue REMICs and Other Structured Securities in transactions in which securities dealers or investors sell us mortgage-related assets in exchange for REMICs and Other Structured Securities. We also issue Other Guarantee Transactions to third parties in exchange for non-Freddie Mac mortgage-related securities.
	PCs
	Our PCs are pass-through debt securities that represent undivided beneficial interests in a pool of mortgages held by a securitization trust. For our fixed-rate PCs, we guarantee the timely payment of interest and principal. For our ARM PCs, we guarantee the timely payment of the weighted average coupon interest rate for the underlying mortgage loans. We do not guarantee the timely payment of principal for ARM PCs; however, we do guarantee the full and final payment of principal.
	In return for providing our guarantee of the payment of principal and interest, we earn a management and guarantee fee that is paid to us over the life of an issued PC, representing a portion of the interest collected on the underlying loans.
	PC Trusts
	We are the primary beneficiary of securitization trusts that issue our single-family PCs and therefore consolidate the assets and liabilities of these trusts at either their: (a) carrying value, if the underlying assets are contributed by us to the trust; or (b) fair value, for those securitization trusts established for our guarantor swap program. Mortgage loans underlying our issued single-family PCs are recognized on our consolidated balance sheets as mortgage loans held-for-investment by consolidated trusts, at amortized cost. The corresponding single-family PCs held by third parties are recognized on our consolidated balance sheets as debt securities of consolidated trusts held by third parties. Refer to “Mortgage Loans” and “Debt Securities Issued” below for further information on the subsequent accounting treatment of these assets and liabilities, respectively.
	REMICs and Other Structured Securities
	Our single-family REMICs and Other Structured Securities use resecuritization trusts and represent beneficial interests in groups of PCs and other types of mortgage-related assets. We create these securities primarily by using PCs or previously issued REMICs and Other Structured Securities as collateral. Similar to our PCs, we guarantee the payment of principal and interest to the holders of the tranches of our REMICs and Other Structured Securities. However, for REMICs and Other Structured Securities where we have already guaranteed the underlying assets, there is no incremental exposure to credit loss assumed by us.
	With respect to the resecuritization trusts used for our single-family REMICs and Other Structured Securities whose underlying assets are PCs or previously issued REMICs and Other Structured Securities, we do not have rights to receive benefits or obligations to absorb losses that could potentially be significant to the trusts because we have already provided a guarantee on the underlying assets. Additionally, our involvement with these trusts does not provide us with any power that would enable us to direct the significant economic activities of these entities. Although we may be exposed to prepayment risk through our ownership of the securities issued by these trusts, we do not have the ability through our involvement with the trust to affect the economic risks to which we are exposed. As a result, we are not the primary beneficiary of, and therefore do not consolidate, the resecuritization trusts used for REMICs and Other Structured Securities whose underlying assets are PCs or previously issued REMICs and Other Structured Securities, unless we hold substantially all of the outstanding beneficial interests that have been issued by the trust.
	We receive a transaction fee from third parties for issuing our single-family REMICs and Other Structured Securities whose underlying assets are PCs or previously issued REMICs and Other Structured Securities. We defer the portion of the transaction fee that is equal to the estimated value of our future administrative responsibilities for these issued REMICs and Other Structured Securities. These responsibilities include ongoing trustee services, administration of pass-through amounts, paying agent services, tax reporting, and other required services. We estimate the value of these future responsibilities based on quotes from third-party vendors who perform each type of service and, where quotes are not available, based on our estimates of what those vendors would charge. The remaining portion of the transaction fee relates to compensation earned in connection with structuring-related services we rendered to third parties and is allocated between REMICs and Other Structured Securities we retain, if any, and the REMICs and Other Structured Securities acquired by third parties, based on the relative fair value of the securities. The portion of the fee allocated to any REMICs and Other Structured Securities we retain is deferred as a carrying value adjustment and is amortized into interest income using the effective interest method over the contractual lives of these securities. The fee allocated to REMICs and Other Structured Securities acquired by third parties is recognized immediately in earnings as other income.
	Our multifamily Other Structured Securities use securitization trusts that meet the definition of a VIE. Our multifamily Other Structured Securities typically involve our acquisition of tax-exempt multifamily housing revenue bonds, placement of those bonds in a securitization trust, and issuance of tax-exempt senior certificates as well as subordinate certificates that provide structural credit protection. The housing revenue bonds are collateralized by low- and moderate-income multifamily housing developments. We guarantee the principal and interest on the senior certificates and, because the underlying collateral is not already guaranteed by us, we receive a management and guarantee fee.
	Our involvement with the securitization trusts used for our multifamily Other Structured Securities whose underlying assets are multifamily housing revenue bonds does not provide us with power that would enable us to direct the significant economic activities of these entities. As a result, we are not the primary beneficiary of, and therefore do not consolidate, these entities.
	Other Guarantee Transactions
	Other Guarantee Transactions are mortgage-related securities that we issue to third parties in exchange for non-Freddie Mac mortgage-related securities. Other Guarantee Transactions typically involve us purchasing either the senior tranches from a non-Freddie Mac senior-subordinated securitization or single-class pass-through securities, placing the acquired assets into a securitization trust, providing a guarantee of the principal and interest of the acquired assets and issuing securities backed by these assets. To the extent that we are deemed to be the primary beneficiary of such a securitization trust, we recognize the mortgage loans underlying the Other Guarantee Transaction as mortgage loans held-for-investment, at amortized cost. Correspondingly, we recognize the issued securities held by third parties as debt securities of consolidated trusts. However, to the extent we are not deemed to be the primary beneficiary of such a securitization trust, we initially recognize a guarantee asset and a guarantee obligation at fair value to the extent a management and guarantee fee is charged. We do not receive transaction fees, apart from our management and guarantee fee, for these transactions.
	Our primary Other Guarantee Transactions are issuances of multifamily K Certificates. In substantially all of these transactions, we guarantee only the most senior tranches of the securities and our initial involvement with the trusts that issue the K Certificates does not provide us with any power that would enable us to direct the significant economic activities of these entities. As a result, we are not the primary beneficiary of, and therefore do not consolidate, these trusts when K Certificates are initially issued. To the extent that our involvement with the trusts changes, we evaluate whether we have become the primary beneficiary.
	Purchases and Sales of Freddie Mac Mortgage-Related Securities
	PCs
	When we purchase PCs that have been issued by consolidated PC trusts, we extinguish the outstanding debt securities of the related consolidated trust. We recognize a gain (loss) on extinguishment of the debt securities to the extent the amount paid to redeem the debt differs from its carrying value, adjusted for any related purchase commitments accounted for as derivatives.
	When we sell PCs that have been issued by consolidated PC trusts, we recognize a liability to the third-party beneficial interest holders of the related consolidated trust as debt securities of consolidated trusts held by third parties. That is, our sale of PCs issued by consolidated PC trusts is accounted for as the issuance of debt.
	Single-Class REMICs and Other Structured Securities
	The collateral for our single-class REMICs and Other Structured Securities includes PCs and previously issued single-class REMICs and Other Structured Securities. We do not consolidate these resecuritization trusts as we are not deemed to be the primary beneficiary of the trusts. Our single-class REMICs and Other Structured Securities pass through all of the cash flows of the underlying PCs directly to the holders of the securities and are deemed to be substantially the same as the underlying PCs. As a result, when we purchase single-class REMICs and Other Structured Securities, we extinguish a pro rata portion of the outstanding debt securities of the related PC trust on our consolidated balance sheets.
	When we sell single-class REMICs and Other Structured Securities, we recognize a liability to the third-party beneficial interest holders of the related consolidated PC trust as debt securities of consolidated trusts held by third parties. That is, our sale of single-class REMICs and Other Structured Securities is accounted for as the issuance of debt.
	Multiclass REMICs and Other Structured Securities
	The collateral for our single-family multiclass REMICs and Other Structured Securities includes PCs and previously issued REMICs and Other Structured Securities. We do not consolidate most of these resecuritization trusts as we are not deemed to be the primary beneficiary of the trusts unless we hold substantially all of the outstanding beneficial interests that have been issued by the trust. In our single-family multiclass REMICs and Other Structured Securities, the cash flows of the underlying PCs are divided (e.g., stripped and/or time tranched). Due primarily to this division of cash flows, these securities are not deemed to be substantially the same as the underlying PCs. As a result, when we purchase single-family multiclass REMICs and Other Structured Securities, we record these securities as investments in debt securities rather than as the extinguishment of debt since we are investing in the debt securities of a non-consolidated entity. See “Investments in Securities” for further information regarding our accounting for investments in multiclass REMICs and Other Structured Securities.
	We recognize, as assets, both the investment in single-family multiclass REMICs and Other Structured Securities and the mortgage loans backing the PCs held by the trusts which underlie the single-family multiclass REMICs and Other Structured Securities. Additionally, we recognize, as liabilities, the unsecured debt issued to third parties to fund the purchase of the single-family multiclass REMICs and Other Structured Securities as well as the debt issued to third parties of the PC trusts we consolidate which underlie the single-family multiclass REMICs and Other Structured Securities. This results in recognition of interest income from both assets and interest expense from both liabilities.
	The collateral for our multifamily multiclass Other Structured Securities typically includes multifamily housing revenue bonds which are collateralized by low- and moderate-income multifamily housing developments. We do not consolidate the securitization trusts that issue these securities as we are not deemed to be the primary beneficiary of the trusts. When we purchase multifamily multiclass Other Structured Securities, we record them as investments in debt securities. See “Investments in Securities” for further information regarding our accounting for investments in multiclass REMICs and Other Structured Securities.
	When we sell multiclass REMICs and Other Structured Securities in which we are not the primary beneficiary of the resecuritization trust, we account for the transfer in accordance with the accounting guidance for transfers of financial assets. To the extent the transfer of multiclass REMICs and Other Structured Securities qualifies as a sale, we de-recognize all assets sold and recognize all assets obtained and liabilities incurred. Any gain (loss) on the sale of multiclass REMICs and Other Structured Securities is reflected in our consolidated statements of comprehensive income as a component of other gains (losses) on investment securities recognized in earnings. To the extent the transfer of multiclass REMICs and Other Structured Securities does not qualify as a sale, we account for the transfer as a financing transaction and recognize a liability for the proceeds received from third parties in the transfer.
	Other Guarantee Commitments
	In certain circumstances, we also provide a guarantee of mortgage-related assets held by third parties, in exchange for a guarantee fee, without securitizing those assets. For example, we provide long-term standby commitments to certain of our single-family customers, which obligate us to purchase seriously delinquent loans that are covered by those commitments. We also provide guarantee commitments on multifamily housing revenue bonds that were issued by HFAs as well as guarantees under the TCLFP on securities backed by HFA bonds.
	Cash and Cash Equivalents
	Highly liquid investment securities that have an original maturity of three months or less are accounted for as cash equivalents. In addition, cash collateral that we have the right to use for general corporate purposes and that we obtain from counterparties to derivative contracts is recorded as cash and cash equivalents.
	Restricted Cash and Cash Equivalents
	Cash collateral accepted from counterparties that we do not have the right to use for general corporate purposes is recorded as restricted cash in our consolidated balance sheets. Restricted cash includes cash remittances received on the underlying assets of our consolidated trusts, which are deposited into a separate custodial account. We invest the cash held in the custodial account in short-term investments and are entitled to the interest income earned on these short-term investments, which is recorded as interest income, other on our consolidated statements of comprehensive income.
	Mortgage Loans
	Upon acquisition, we classify a loan as either held-for-sale or held-for-investment. Mortgage loans that we have the ability and intent to hold for the foreseeable future are classified as held-for-investment. Loans we acquire and which we intend to securitize using an entity we will consolidate will be classified as held-for-investment both prior to and subsequent to their securitization, in accordance with our intent and ability to hold such loans for the foreseeable future.
	Held-for-investment mortgage loans are reported in our consolidated balance sheets at their outstanding UPB, net of deferred fees and other cost basis adjustments (including unamortized premiums and discounts, delivery fees and other pricing adjustments). These deferred items are amortized into interest income over the contractual lives of the loans using the effective interest method. We recognize interest income on an accrual basis except when we believe the collection of principal and interest in full is not reasonably assured. If the collection of principal and interest in full is not reasonably assured, we cease the accrual of interest income and any interest income accrued but uncollected is reversed.
	Mortgage loans not classified as held-for-investment are classified as held-for-sale. Held-for-sale loans are reported at lower-of-cost-or-fair-value on our consolidated balance sheets. Any excess of a held-for-sale loan’s cost over its fair value is recognized as a valuation allowance in other income on our consolidated statements of comprehensive income, with changes in this valuation allowance also being recorded in other income. Premiums, discounts, and other cost basis adjustments recognized upon acquisition on single-family loans classified as held-for-sale are deferred and not amortized. We elected the fair value option for multifamily mortgage loans held for sale that we intend to securitize and sell to investors. See “NOTE 16: FAIR VALUE DISCLOSURES — Fair Value Option — Multifamily Held-For-Sale Mortgage Loans” and “NOTE 16: FAIR VALUE DISCLOSURES — Fair Value Option — Changes in Fair Value under the Fair Value Option Election.” Thus, these multifamily mortgage loans are measured at fair value on a recurring basis, with subsequent gains or losses related to changes in fair value reported in other income in our consolidated statements of comprehensive income.
	Cash flows related to mortgage loans originally classified as held-for-investment are classified as either investing activities (e.g., principal repayments) or operating activities (e.g., interest payments received from borrowers included within net income (loss)). Cash flows related to mortgage loans originally classified as held-for-sale are classified in operating activities.
	Non-Accrual Loans
	We place mortgage loans on non-accrual status when we believe collectability of principal and interest in full is not reasonably assured, which generally occurs when a loan is three monthly payments past due, unless the loan is well secured and in the process of collection based upon an individual loan assessment. A loan is considered past due if a full payment of principal and interest is not received within one month of its due date. When a loan is placed on non-accrual status, any interest income accrued but uncollected is reversed. Thereafter, interest income is recognized only upon receipt of cash payments.
	A non-accrual mortgage loan may be returned to accrual status when the collectability of principal and interest in full is reasonably assured. For single-family loans, we determine that collectability is reasonably assured when we have received payment of principal and interest such that the loan becomes less than three monthly payments past due. For multifamily loans, the collectability of principal and interest is considered reasonably assured based on a quantitative and qualitative analysis of the factors specific to the loan being assessed. Upon a loan’s return to accrual status, all previously reversed interest income is recognized and amortization of any basis adjustments into interest income is resumed.
Allowance for Loan Losses and Reserve for Guarantee Losses
The allowance for loan losses and the reserve for guarantee losses represent estimates of probable incurred credit losses. The allowance for loan losses pertains to all single-family and multifamily loans classified as held-for-investment on our consolidated balance sheets whereas the reserve for guarantee losses relates to single-family and multifamily loans underlying our non-consolidated Freddie Mac mortgage-related securities and other guarantee commitments. Total held-for-investment mortgage loans, net are shown net of the allowance for loan losses on our consolidated balance sheets. The reserve for guarantee losses is included within other liabilities on our consolidated balance sheets. Collectively, we refer to our allowance for loan losses and our reserve for guarantee losses as our loan loss reserves. We recognize probable incurred losses by recording a charge to the provision for credit losses in our consolidated statements of comprehensive income. Determining the appropriateness of the loan loss reserves is a complex process that is subject to numerous estimates and assumptions requiring significant judgment about matters that involve a high degree of subjectivity.
We estimate credit losses related to homogeneous pools of loans in accordance with the accounting guidance for contingencies. Accordingly, we maintain an allowance for loan losses on mortgage loans held-for-investment when it is probable that a loss has been incurred and the amount of the loss can be reasonably estimated. Loans that we evaluate for individual impairment are measured in accordance with the accounting guidance for receivables. For more information, refer to “Impaired Loans” below.
For both the single-family and multifamily portfolios, we charge off (in full or in part) our recorded investment in a loan in the period it is determined that the loan (or a portion thereof) is uncollectible, which generally occurs at final disposition of the loan through foreclosure or other loss event. However, if losses are evident prior to final disposition, earlier recognition of a charge-off is required by our policies. A charge-off is also recorded if we realize a specific credit loss upon the modification of a loan in a TDR. We do not have any established threshold in terms of days past due beyond which we partially or fully charge-off loans.
Single-Family Loans
We determine single-family loan loss reserves both on a collective and individual basis. For further discussion on individually impaired single-family loans, refer to “Impaired Loans” below.
We estimate loan loss reserves on homogeneous pools of single-family loans using a statistically based model that evaluates a variety of factors affecting collectability. The homogeneous pools of single-family mortgage loans are determined based on common underlying characteristics, including estimated current LTV ratios, trends in home prices, loan product type, and geographic region. In determining the loan loss reserves for single-family loans at the balance sheet date, we evaluate key inputs and factors including, but not limited to:
•	estimated current LTV ratios and historical trends in home prices;
•	loan product type;
•	delinquency/default status and history;
•	actual and estimated rates of collateral loss severity for similar loans;
•	geographic location;
•	loan age;
•	sourcing channel;
•	occupancy type;
•	UPB at origination;
•	expected ability to partially mitigate losses through loan modification or other alternatives to foreclosure;
•	expected proceeds from mortgage insurance contracts that are contractually attached to a loan or other credit enhancements that were entered into contemporaneously with and in contemplation of a guarantee or loan purchase transaction;
•	expected repurchases of mortgage loans by seller/servicers;
•	counterparty credit of mortgage insurers and seller/servicers;
•	pre-foreclosure real estate taxes and insurance;
•	estimated selling costs should the underlying property ultimately be sold; and
•	trends in the timing of foreclosures.
For additional information on estimated current LTV ratios and single-family loan loss reserves, see “NOTE 4: MORTGAGE LOANS AND LOAN LOSS RESERVES — Credit Quality of Mortgage Loans.”
We rely upon third-parties to provide primary servicing for the performing and non-performing loan portfolios. At loan delivery, the seller provides us with the loan data, which includes loan characteristics and underwriting information. Each month, the servicers provide us with monthly loan level servicing data, including delinquency and loss information.
Certain loan servicing data is reported to us on a real-time basis, such as loan pay-offs and foreclosure events. However, certain monthly servicing data, including delinquency status, is delivered on a one-month delay. For example, December loan delinquency data delivered to us at the end of December or beginning of January reflects the loan delinquency status related to the December 1 payment cycle. We incorporate the delinquency status data into our allowance for loan loss calculation generally without adjustment for the one-month delay.
Our single-family loan loss reserve default models are estimated based on 12 months of actual loan performance data, including loan status and delinquency data reported by our servicers. The loan performance data provides a loan level history of delinquency, foreclosures, foreclosure alternatives and modifications. Our single-family loan loss reserve severity is based on the repeat housing sales index and actual REO dispositions, short sale and third-party values that incorporates the most recent: (a) six months of sales experience realized on our distressed property dispositions; and (b) twelve months of pre-foreclosure expenses on our distressed properties including REO, short sales, and third-party sales. Our single-family loan loss severity estimate also captures current business area practices and expectations about recoveries from mortgage insurance or due to seller/servicer repurchases. We use historical trends in home prices in our single-family loan loss reserve process, primarily through the use of estimated current total LTV ratios in our default models and through the use of recent home price sales experience in our severity estimate. However, we do not use a forecast of trends in home prices in our single-family loan loss reserve process. See endnote (1) to “Table 4.2 — Recorded Investment of Held-for-Investment Mortgage Loans, by LTV Ratio” for more information about the repeat housing sales index.
Our loan loss reserves reflect our best current estimates of incurred losses. Our loan loss reserve estimate includes projections related to loss mitigation activities, including loan modifications for troubled borrowers, and projections of recoveries through repurchases by seller/servicers of defaulted loans due to failure to follow contractual underwriting requirements at the time of the loan origination. These projections are based on our recent historical experience and current business practices and require significant management judgment. We monitor our projections of recoveries through seller/servicer repurchases to ensure that these projections are reasonable and consistent with our assessment of the credit capacity of our seller/servicer counterparties. For loans where foreclosure is probable, impairment is measured based upon an estimate of the fair value of the underlying collateral less estimated disposition costs. Our estimate also considers the effect of historical home price changes on borrower behavior.
Our reserve estimate also reflects our best projection of defaults we believe are likely to occur as a result of loss events that have occurred through December 31, 2014 and 2013, respectively. However, fluctuations in the U.S. housing market, the uncertainty in other macroeconomic factors, and variations in success rates of modification efforts under HAMP and other loan workout programs, make estimating loss events inherently imprecise.
We validate and update our models and factors to capture changes in actual loss experience, as well as the effects of changes in underwriting practices and in our loss mitigation strategies. We also consider macroeconomic and other factors that impact the quality of the loans underlying our portfolio including regional housing trends, applicable home price indices, unemployment and employment dislocation trends, the effects of changes in government policies and programs, consumer credit statistics, and the extent of third-party insurance. We consider our assessment of these factors in determining our loan loss reserves.
We apply proceeds from primary mortgage insurance that is contractually attached to a loan and from other credit enhancements, including repurchase recoveries, entered into contemporaneously with and in contemplation of a guarantee or loan purchase transaction, as a recovery of our recorded investment in a charged-off loan, up to the amount of loss recognized as a charge-off. Proceeds received in excess of our recorded investment in charged-off loans are recorded as a decrease to REO operations expense in our consolidated statements of comprehensive income. We record receivables for proceeds from primary mortgage insurance and other credit enhancements, including repurchase recoveries, when the proceeds are estimable and collectability is reasonably assured. We generally accrue receivables for primary mortgage insurance, pool insurance, and most other types of credit enhancements at the time of final disposition of the loan as we have a history of collection of these types of recoveries and the amounts are estimable based on the contractual terms of the agreements. However, due to the uncertainty of the timing and amount of collections of repurchase recoveries, we generally do not accrue receivables for repurchase recoveries and instead record repurchase recoveries received on a cash basis.
Multifamily Loans
For multifamily loans identified as impaired, we individually determine the loan loss reserves. Refer to “Impaired Loans” below for further discussion on individually impaired multifamily loans. Multifamily loans evaluated collectively for impairment are aggregated into book year vintages and measured by benchmarking published historical commercial mortgage data to those vintages based upon available economic data related to multifamily real estate, including apartment vacancy and rental rates.
Impaired Loans
We consider a loan to be impaired when it is probable, based on current information, that we will not receive all amounts due (including both principal and interest) in accordance with the contractual terms of the original loan agreement. Delays in the timing of our expected receipt of these amounts that are more than insignificant are considered in making this assessment.
Single-Family Loans
Individually impaired single-family loans primarily include loans that have undergone a TDR. These loans are measured individually for impairment as discussed below in "Troubled Debt Restructurings." If we determine that foreclosure on the underlying collateral is probable, we measure impairment based upon the fair value of the collateral, as reduced by estimated disposition costs and adjusted for estimated proceeds from insurance and similar sources.
Multifamily Loans
Multifamily impaired loans include TDRs, loans three monthly payments or more past due, and loans that are deemed impaired based on management judgment. Factors considered by management in determining whether a loan is impaired include, but are not limited to, the underlying property’s operating performance as represented by its current DSCR, available credit enhancements, estimated current LTV ratio, management of the underlying property, and the property’s geographic location.
Multifamily loans are generally measured individually for impairment based on the fair value of the underlying collateral, as reduced by estimated disposition costs, as the repayment of these loans is generally provided from the cash flows of the underlying collateral and any associated credit-enhancement. Except for cases of fraud and certain other types of borrower defaults, most multifamily loans are non-recourse to the borrower. As a result, the cash flows of the underlying property (including any associated credit enhancements) serve as the source of funds for repayment of the loan. Interest income recognition on multifamily impaired loans is subject to our non-accrual policy as discussed in “Mortgage Loans — Non-Accrual Loans.”
Troubled Debt Restructurings
Single-family and multifamily loans which experience a modification to their contractual terms which results in a concession being granted to a borrower experiencing financial difficulties are considered TDRs. A concession is deemed granted when, as a result of the restructuring, we do not expect to collect all amounts due, including interest accrued, at the original contractual interest rate. As appropriate, we also consider other qualitative factors in determining whether a concession is deemed granted, including whether the borrower’s modified interest rate is consistent with that of a non-troubled borrower. We do not consider restructurings that result in a delay in payment that is insignificant to be a concession. We generally consider a delay in monthly amortizing payments of three months or less to be insignificant. We generally consider all other delays to be more than insignificant. A concession typically includes one or more of the following being granted to the borrower: (a) a trial period where the expected permanent modification will change our expectation of collecting all amounts due at the original contract rate; (b) a delay in payment that is more than insignificant; (c) a reduction in the contractual interest rate; (d) interest forbearance for a period of time that is not insignificant or forgiveness of accrued but uncollected interest amounts; (e) principal forbearance that is more than insignificant or a reduction in the principal amount of the loan; and (f) discharge of the borrower’s obligation in Chapter 7 bankruptcy.
Impairment of a loan having undergone a TDR is generally measured as the excess of our recorded investment in the loan over the present value of the expected future cash flows, discounted at the loan’s original effective interest rate for fixed-rate loans or at the loan’s effective interest rate prior to the restructuring for ARM loans. Our expectation of future cash flows incorporates, among other items, an estimated probability of default which is based on a number of market factors as well as the characteristics of the loan, such as past due status. Subsequent to the restructuring date, interest income is recognized at the modified interest rate, subject to our non-accrual policy as discussed in “Mortgage Loans — Non-Accrual Loans” above, with all other changes in the present value of expected future cash flows being recognized as a component of the provision for credit losses in our consolidated statements of comprehensive income.
Investments in Securities
Investments in securities consist primarily of mortgage-related securities. We classify securities as “available-for-sale” or “trading.” As of December 31, 2014 and 2013, we did not classify any securities as “held-to-maturity,” although we may elect to do so in the future. Securities classified as available-for-sale and trading are reported at fair value with changes in fair value included in AOCI and other gains (losses) on investment securities recognized in earnings, respectively. See “NOTE 16: FAIR VALUE DISCLOSURES” for more information on how we determine the fair value of securities.
We elected the fair value option for certain available-for-sale mortgage-related securities, including investments in securities that: (a) can contractually be prepaid or otherwise settled in such a way that we may not recover substantially all of our initial recorded investment; or (b) are not of high credit quality at the acquisition date and are identified as within the scope of the accounting guidance for investments in beneficial interests in securitized financial assets. These securities are classified as trading securities. By electing the fair value option for these instruments, we reflect valuation changes through our consolidated statements of comprehensive income in the period they occur. For additional information on our election of the fair value option, see “NOTE 16: FAIR VALUE DISCLOSURES.”
We record purchases and sales of securities that are exempt from the accounting guidance for derivatives and hedge accounting on a trade date basis. Securities underlying forward purchases and sales contracts that are not exempt from the requirements of derivatives and hedge accounting are recorded on the expected settlement date with a corresponding commitment recorded on the trade date.
For most of our investments in securities, interest income is recognized using the effective interest method. Deferred items, including premiums, discounts, and other basis adjustments, are amortized into interest income over the contractual lives of the securities.
For certain investments in securities, interest income is recognized using the prospective effective interest method. We specifically apply this accounting to beneficial interests in securitized financial assets that: (a) can contractually be prepaid or otherwise settled in such a way that we may not recover substantially all of our recorded investment; (b) are not of high credit quality at the acquisition date; or (c) have been determined to be other-than-temporarily impaired. We recognize as interest income (over the life of these securities) the excess of all estimated cash flows attributable to these interests over their book value using the effective interest method. We update our estimates of expected cash flows periodically and recognize changes in the calculated effective interest rate on a prospective basis.
We evaluate available-for-sale securities in an unrealized loss position as of the end of each quarter for other-than-temporary impairment. An unrealized loss exists when the fair value of an individual security is less than its amortized cost basis. As discussed further below, certain other-than-temporary impairment losses are recognized in earnings.
If we intend to sell the security or believe it is more likely than not that we will be required to sell the security prior to recovery of its amortized cost basis, the security’s entire decline in fair value is deemed to be other-than-temporary and is recorded within our consolidated statements of comprehensive income as net impairment of available-for-sale securities recognized in earnings. If we do not intend to sell the security and we believe it is not more likely than not that we will be required to sell prior to recovery of the security’s unrealized loss, we recognize only the credit component of other-than-temporary impairment in earnings and the amounts attributable to all other factors are recorded in AOCI. The credit component represents the amount by which the present value of cash flows expected to be collected from the security is less than the amortized cost basis of the security. The present value of expected future cash flows represents our estimate of future contractual cash flows that we expect to collect, discounted at the original effective interest rate or the effective interest rate determined based on significantly improved cash flows subsequent to initial impairment.
The evaluation of whether unrealized losses on available-for-sale securities are other-than-temporary requires significant management judgments and assumptions and consideration of numerous factors. We perform an evaluation on a security-by-security basis considering all available information. The relative importance of this information varies based on the facts and circumstances surrounding each security, as well as the economic environment at the time of assessment. For information regarding important factors, judgments and assumptions, see “NOTE 7: INVESTMENTS IN SECURITIES — Impairment Recognition on Investments in Securities.”
Gains and losses on the sale of securities are included in other gains (losses) on investment securities recognized in earnings, including those gains (losses) reclassified into earnings from AOCI. We use the specific identification method for determining the cost basis of a security in computing the gain or loss.
For securities classified as trading or available-for-sale, we classify the cash flows as investing activities because we hold these securities for investment purposes. In cases where the transfer of available-for-sale securities represents a secured borrowing, we classify the related cash flows as financing activities.
Repurchase and Resale Agreements and Dollar Roll Transactions
We enter into repurchase and resale agreements primarily as an investor or to finance certain of our security positions. Such transactions are accounted for as secured financings because the transferor does not relinquish control over the transferred assets.
We also engage in dollar roll transactions whereby we enter into an agreement to sell and subsequently repurchase (or purchase and subsequently resell) agency securities. When these transactions involve securities issued by consolidated entities, they are treated as issuances and extinguishments of debt. When these transactions involve securities issued by entities we do not consolidate, they are treated as purchases and sales as the security initially transferred is not required to be the same or substantially the same as the security subsequently returned.
Debt Securities Issued
Debt securities that we issue are classified on our consolidated balance sheets as either debt securities of consolidated trusts held by third parties or other debt. The debt securities of our consolidated trusts are prepayable without penalty at any time. Other debt represents short-term and long-term debt securities that we issue to third parties to fund our general business activities.
Both debt of our consolidated trusts and other debt, except for certain debt for which we elected the fair value option, are reported at amortized cost. Deferred items, including premiums, discounts, and hedging-related basis adjustments are reported as a component of total debt, net. Issuance costs are reported as a component of other assets. These items are amortized and reported through interest expense using the effective interest method over the contractual life of the related indebtedness. Amortization of premiums, discounts, and issuance costs begins at the time of debt issuance. Amortization of hedging-related basis adjustments begins upon the discontinuation of the related hedge relationship.
We elected the fair value option on certain debt securities of consolidated trusts held by third parties and certain other debt. The change in fair value for debt recorded at fair value is reported as other income in our consolidated statements of comprehensive income. For debt where we have elected the fair value option, upfront costs and fees are recognized in earnings as incurred and not deferred. For additional information on our election of the fair value option, see “NOTE 16: FAIR VALUE DISCLOSURES.”
When we repurchase or call outstanding debt securities, we recognize a gain or loss related to the difference between the amount paid to redeem the debt security and the carrying value in earnings as a component of gains (losses) on retirement of other debt. Contemporaneous transfers of cash between us and a creditor in connection with the issuance of a new debt security and satisfaction of an existing debt security are accounted for as either an extinguishment or a modification of an existing debt security. If the debt securities have substantially different terms, the transaction is accounted for as an extinguishment of the existing debt security. The issuance of a new debt security is recorded at fair value, fees paid to the creditor are expensed as incurred and fees paid to third parties are deferred and amortized into interest expense over the life of the new debt security using the effective interest method. If the terms of the existing debt security and the new debt security are not substantially different, the transaction is accounted for as a modification of the existing debt. Fees paid to the creditor are deferred and amortized into interest expense over the life of the modified unsecured debt security using the effective interest method and fees paid to third parties are expensed as incurred.
Cash flows related to debt securities issued by our consolidated trusts are classified as either financing activities (e.g., repayment of principal to PC holders) or operating activities (e.g., interest payments to PC holders included within net income (loss)). Other than interest paid, cash flows related to other debt are classified as financing activities. Interest paid on other debt is classified as operating activities.
Derivatives
Derivatives are reported at their fair value on our consolidated balance sheets. Derivatives in a net asset position, including net derivative interest receivable or payable, are reported as derivative assets, net. Similarly, derivatives in a net liability position, including net derivative interest receivable or payable, are reported as derivative liabilities, net. We offset fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral against fair value amounts recognized for derivative instruments executed with the same counterparty under a master netting agreement. Changes in fair value and interest accruals on derivatives are recorded as derivative gains (losses) in our consolidated statements of comprehensive income. Non-cash collateral held is not recognized on our consolidated balance sheets as we do not obtain effective control over the collateral, and non-cash collateral posted is not de-recognized from our consolidated balance sheets as we do not relinquish effective control over the collateral. Therefore, non-cash collateral held or posted is not presented as an offset against derivative assets or derivative liabilities on our consolidated balance sheets.
We evaluate whether financial instruments that we purchase or issue contain embedded derivatives. We elected to measure newly acquired or issued financial instruments that contain embedded derivatives at fair value, with changes in fair value recorded in our consolidated statements of comprehensive income.
At December 31, 2014 and 2013, we did not have any derivatives in hedge accounting relationships; however, there are amounts recorded in AOCI related to discontinued cash flow hedges which are recognized in earnings when the originally forecasted transactions affect earnings. If it becomes probable the originally forecasted transaction will not occur, the associated deferred gain or loss in AOCI would be reclassified to earnings immediately.
In the consolidated statements of cash flows, cash flows related to the acquisition and termination of derivatives, other than forward commitments, are generally classified in investing activities. Cash flows related to forward commitments are classified within the section of the consolidated statements of cash flows in accordance with the cash flows of the financial instruments to which they relate.
REO
REO is initially recorded at fair value less costs to sell and is subsequently carried at the lower of cost or fair value less costs to sell. When we acquire REO, losses arise when the recorded investment in the loan (including accrued interest) exceeds the fair value of the foreclosed property, net of estimated costs to sell and expected recoveries through credit enhancements. Losses are charged off against the allowance for loan losses at the time of REO acquisition. REO gains arise and are recognized immediately in earnings when the fair value of the foreclosed property less costs to sell plus expected recoveries through credit enhancements exceeds the recorded investment in the loan (including all amounts due from the borrower).
Amounts we expect to receive from third-party insurance (primary mortgage insurance and pool insurance) and most other credit enhancements are recorded as receivables when REO is acquired. The receivable is adjusted when the actual claim is filed and is reported as a component of other assets on our consolidated balance sheets. We do not record receivables for repurchase recoveries. We record these on a cash basis due to uncertainty of the timing and amount of collections.
Material development and improvement costs relating to REO are capitalized. Operating expenses specifically identifiable with an REO property are included in REO operations income (expense) in our consolidated statements of comprehensive income; all other expenses are recognized within other administrative expenses in our consolidated statements of comprehensive income. Declines in the fair value of REO are provided for and charged to REO operations income (expense). Any gains and losses from REO dispositions are included in REO operations income (expense).
Income Taxes
We use the asset and liability method of accounting for income taxes for financial reporting purposes. Under this method, deferred tax assets and liabilities are recognized based upon the expected future tax consequences of existing temporary differences between the financial reporting and the tax reporting basis of assets and liabilities using enacted statutory tax rates as well as tax net operating loss and tax credit carryforwards. To the extent tax laws change, deferred tax assets and liabilities are adjusted, when necessary, in the period that the tax change is enacted. Valuation allowances are recorded to reduce net deferred tax assets when it is more likely than not that all or part of our tax benefits will not be realized. The realization of these net deferred tax assets is dependent upon the generation of sufficient taxable income from current operations and from unrecognized tax benefits.
Income tax benefit (expense) includes: (a) deferred tax benefit (expense), which represents the net change in the deferred tax asset or liability balance during the year plus any change in a valuation allowance; and (b) current tax benefit (expense), which represents the amount of tax currently payable to or receivable from a tax authority including any related interest and penalties plus amounts accrued for unrecognized tax benefits (also including any related interest and penalties). Income tax benefit (expense) excludes the tax effects related to adjustments recorded to equity, such as unrealized gains and losses related to available-for-sale securities.
Regarding tax positions taken or expected to be taken (and any associated interest and penalties), we recognize a tax position so long as it is more likely than not that it will be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. We measure the tax position at the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement. See “NOTE 12: INCOME TAXES” for additional information.
Earnings Per Common Share
The August 2012 amendment to the Purchase Agreement changed the manner in which the dividend on the senior preferred stock is determined. For each quarter from January 1, 2013 through and including December 31, 2017, the dividend payment will be the amount, if any, by which our Net Worth Amount at the end of the immediately preceding fiscal quarter, less the applicable Capital Reserve Amount, exceeds zero. See "NOTE 11: STOCKHOLDERS' EQUITY — Senior Preferred Stock" for additional information regarding the Capital Reserve Amount. For each quarter beginning January 1, 2018, the dividend payment will be the amount, if any, by which our Net Worth Amount at the end of the immediately preceding fiscal quarter exceeds zero. The dividend is presented in the period in which it is determinable for the senior preferred stock as a reduction to net income (loss) available to common stockholders and net income (loss) per common share. The dividend is declared and paid in the following period and recorded as a reduction to equity in the period declared.
We have participating securities related to options and restricted stock units with dividend equivalent rights that receive dividends as declared on an equal basis with common shares but are not obligated to participate in undistributed net losses. These participating securities consist of: (a) vested options to purchase common stock; and (b) vested and unvested restricted stock units that earn dividend equivalents at the same rate when and as declared on common stock. Consequently, in accordance with accounting guidance, we use the “two-class” method of computing earnings per common share. The “two-class” method is an earnings allocation formula that determines earnings per share for common stock and participating securities based on dividends declared and participation rights in undistributed earnings.
Basic earnings per common share is computed as net income attributable to common stockholders divided by the weighted average common shares outstanding for the period. The weighted average common shares outstanding for the period includes the weighted average number of shares that are associated with the warrant for our common stock issued to Treasury pursuant to the Purchase Agreement. These shares are included since the warrant is unconditionally exercisable by the holder at a minimal cost. See “NOTE 2: CONSERVATORSHIP AND RELATED MATTERS” for further information.
Diluted earnings per common share is computed as net income attributable to common stockholders divided by the weighted average common shares outstanding during the period adjusted for the dilutive effect of common equivalent shares outstanding. For periods with net income attributable to common stockholders, the calculation includes the effect of the following common stock equivalent shares outstanding: (a) weighted average shares related to stock options if the average market price during the period exceeds the exercise price; and (b) the weighted-average of unvested restricted stock units. During periods in which a net loss attributable to common stockholders has been incurred, potential common equivalent shares outstanding are not included in the calculation because it would have an antidilutive effect. See “NOTE 11: STOCKHOLDERS’ EQUITY — Stock-Based Compensation” for additional information on our earnings-per-share calculation.
Comprehensive Income
Comprehensive income includes all changes in equity during a period, except those resulting from investments by stockholders. We define comprehensive income as consisting of net income (loss) plus after-tax changes in: (a) the unrealized gains and losses on available-for-sale securities; (b) the effective portion of derivatives accounted for as cash flow hedge relationships; and (c) defined benefit plans.
Recent Accounting Guidance
The following table provides a brief description of recent accounting pronouncements that could affect our financial statements.
Standard	Description	Date of Adoption	Effect on the financial statements
Recently Adopted Accounting Guidance
ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects (Topic 323)	The amendment permits entities to elect to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met.	1-Jan-14	The adoption of this amendment did not have a material impact on our consolidated financial statements.
ASU 2011-04, Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs (Topic 820)	This amendment provided: (a) clarification about the application of existing fair value measurement and disclosure requirements; and (b) changes to the guidance for measuring fair value and disclosing information about fair value measurements.	1-Jan-12	The adoption of this amendment did not have a material impact on our consolidated financial statements.
ASU 2011-03, Reconsideration of Effective Control for Repurchase Agreements (Topic 860)	This amendment removed the criterion related to collateral maintenance from the transferor’s assessment of effective control. It focuses the assessment of effective control on the transferor’s rights and obligations with respect to the transferred financial assets and not whether the transferor has the practical ability to perform in accordance with those rights or obligations.	1-Jan-12	The adoption of this amendment did not have a material impact on our consolidated financial statements.
Recently Issued Accounting Guidance, Not Yet Adopted Within our Consolidated Financial Statements
ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (Topic 310)	The amendment clarifies that a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either: (a) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure; or (b) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement.	1-Jan-15	We do not expect that the adoption of this amendment will have a material impact on our consolidated financial statements.
ASU 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures (Topic 860)	The amendment requires repurchase-to-maturity transactions to be accounted for as secured borrowings and requires separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty.	1-Jan-15	We do not expect that the adoption of this amendment will have a material impact on our consolidated financial statements.
ASU 2014-09, Revenue from Contracts with Customers (Topic 606)	The amendment requires entities to recognize revenue to depict the transfer of promised goods or services to customers in amounts that reflect the consideration to which the entity expects to be entitled in exchange for those goods or services.	1-Jan-17	We are evaluating the impact that the adoption of this amendment will have on our consolidated financial statements
ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure (Topic 310)	The amendment requires that a mortgage loan be de-recognized and a separate receivable be recognized upon foreclosure if certain conditions are met. If those conditions are met and such a receivable is recognized, the receivable should be measured based on the amount of principal and interest related to the loan expected to be recovered from the guarantor.	1-Jan-15	We do not expect that the adoption of this amendment will have a material impact on our consolidated financial statements.

Conservatorship_and_Related_Ma

Conservatorship and Related Matters	12 Months Ended
	Dec. 31, 2014
Conservatorship and Related Matters [Abstract]
CONSERVATORSHIP AND RELATED MATTERS	NOTE 2: CONSERVATORSHIP AND RELATED MATTERS
	Business Objectives
	We operate under the conservatorship that commenced on September 6, 2008, conducting our business under the direction of FHFA, as our Conservator. The conservatorship and related matters continue to have wide-ranging effects on us, including on our management, business activities, financial condition and results of operations. Upon its appointment, FHFA, as Conservator, immediately succeeded to all rights, titles, powers and privileges of Freddie Mac, and of any stockholder, officer or director thereof, with respect to the company and its assets. The Conservator also succeeded to the title to all books, records, and assets of Freddie Mac held by any other legal custodian or third party. The Conservator has delegated certain authority to the Board of Directors to oversee, and management to conduct, business operations so that the company can continue to operate in the ordinary course. The directors serve on behalf of, and exercise authority as directed by, the Conservator.
	We are also subject to certain constraints on our business activities under the Purchase Agreement. However, we believe that the support provided by Treasury pursuant to the Purchase Agreement currently enables us to maintain our access to the debt markets and to have adequate liquidity to conduct our normal business activities, although the costs of our debt funding could vary. Our ability to access funds from Treasury under the Purchase Agreement is critical to keeping us solvent.
	Our current business objectives reflect direction we have received from the Conservator (including the Conservatorship Scorecards). At the direction of the Conservator, we have made changes to certain business practices that are designed to provide support for the mortgage market in a manner that serves our public mission and other non-financial objectives but may not contribute to our profitability. Certain of these objectives are intended to help homeowners and the mortgage market and may help to mitigate future credit losses. Some of these initiatives impact our near- and long-term financial results. Given our public mission and the important role the Administration and our Conservator have placed on Freddie Mac in addressing housing and mortgage market conditions, we may be required to take actions that could have a negative impact on our business, operating results or financial condition, and thus contribute to a need for additional draws under the Purchase Agreement.
	In May 2014, FHFA issued its 2014 Strategic Plan, which updated FHFA's vision for implementing its obligations as Conservator of Freddie Mac and Fannie Mae and established three reformulated strategic goals. FHFA has also issued its Conservatorship Scorecards for 2014 and 2015. The Conservatorship Scorecards establish objectives and performance targets and measures for Freddie Mac and Fannie Mae (the “Enterprises”) related to the strategic goals set forth in the Strategic Plan.
	The 2014 Strategic Plan established three reformulated strategic goals for the conservatorships of Freddie Mac and Fannie Mae:
	•	Maintain, in a safe and sound manner, foreclosure prevention activities and credit availability for new and refinanced mortgages to foster liquid, efficient, competitive and resilient national housing finance markets.
	•	Reduce taxpayer risk through increasing the role of private capital in the mortgage market.
	•	Build a new single-family securitization infrastructure for use by the Enterprises and adaptable for use by other participants in the secondary market in the future.
	As part of the first goal, the 2014 Strategic Plan describes various steps related to increasing access to mortgage credit for credit-worthy borrowers. The 2014 Strategic Plan provides for the Enterprises to continue to play an ongoing role in supporting multifamily housing needs, particularly for low-income households. The plan states that FHFA will continue to impose a production cap on Freddie Mac’s and Fannie Mae’s multifamily businesses.
	The second goal focuses on ways to transfer risk to private market participants and away from the Enterprises in a responsible way that does not reduce liquidity or adversely impact the availability of mortgage credit. The second goal provides for us to increase the use of single-family credit risk transfer transactions, continue using credit risk transfer transactions in the multifamily business and continue shrinking our mortgage-related investments portfolio consistent with the requirements in the Purchase Agreement, with a focus on selling less liquid assets.
	The third goal includes the continued development of the Common Securitization Platform. FHFA refined the scope of this project to focus on making the new shared system operational for Freddie Mac’s and Fannie Mae’s existing single-family securitization activities. The third goal also provides for the Enterprises to work towards the development of a single (common) security.
	We continue to align our resources and internal business plans to meet the goals and objectives provided to us by FHFA.
	As a result of the net worth sweep dividend provisions of the senior preferred stock, we cannot retain capital from the earnings generated by our business operations or return capital to stockholders other than Treasury, the holder of our senior preferred stock. Our future is uncertain, and the conservatorship has no specified termination date. We do not know what changes may occur to our business model during or following conservatorship, including whether we will continue to exist. We are not aware of any current plans of our Conservator to significantly change our business model or capital structure in the near term. Our future structure and role will be determined by the Administration and Congress, and there are likely to be significant changes beyond the near term. We have no ability to predict the outcome of these deliberations.
	Purchase Agreement and Warrant
	Overview
	On September 7, 2008, we, through FHFA, in its capacity as Conservator, entered into the Purchase Agreement with Treasury. The Purchase Agreement was subsequently amended and restated on September 26, 2008, and further amended on May 6, 2009, December 24, 2009, and August 17, 2012. The amount of available funding remaining under the Purchase Agreement was $140.5 billion as of December 31, 2014. This amount will be reduced by any future draws.
	The Purchase Agreement requires Treasury, upon the request of the Conservator, to provide funds to us after any quarter in which we have a negative net worth (that is, our total liabilities exceed our total assets, as reflected on our GAAP balance sheet). In addition, the Purchase Agreement requires Treasury, upon the request of the Conservator, to provide funds to us if the Conservator determines, at any time, that it will be mandated by law to appoint a receiver for us unless we receive these funds from Treasury. In exchange for Treasury’s funding commitment, we issued to Treasury, as an aggregate initial commitment fee: (a) one million shares of Variable Liquidation Preference Senior Preferred Stock (with an initial liquidation preference of $1 billion), which we refer to as the senior preferred stock; and (b) a warrant to purchase, for a nominal price, shares of our common stock equal to 79.9% of the total number of shares of our common stock outstanding on a fully diluted basis at the time the warrant is exercised, which we refer to as the warrant. We received no other consideration from Treasury for issuing the senior preferred stock or the warrant.
	Treasury, as the holder of the senior preferred stock, is entitled to receive quarterly cash dividends, when, as and if declared by our Board of Directors. Through December 31, 2012, the senior preferred stock accrued quarterly cumulative dividends at a rate of 10% per year. However, under the August 2012 amendment to the Purchase Agreement, the fixed dividend rate was replaced with a net worth sweep dividend beginning in the first quarter of 2013.
	For each quarter from January 1, 2013 through and including December 31, 2017, the dividend payment will be the amount, if any, by which our Net Worth Amount at the end of the immediately preceding fiscal quarter, less the applicable Capital Reserve Amount, exceeds zero. The term Net Worth Amount is defined as: (a) the total assets of Freddie Mac (excluding Treasury’s commitment and any unfunded amounts thereof), less; (b) our total liabilities (excluding any obligation in respect of capital stock), in each case as reflected on our consolidated balance sheets prepared in accordance with GAAP. If the calculation of the dividend payment for a quarter does not exceed zero, then no dividend will accrue or be payable for that quarter. The applicable Capital Reserve Amount was $2.4 billion for 2014, will be $1.8 billion for 2015, and will be reduced by $600 million each year thereafter until it reaches zero on January 1, 2018. For each quarter beginning January 1, 2018, the dividend payment will be the amount, if any, by which our Net Worth Amount at the end of the immediately preceding fiscal quarter exceeds zero. The amounts payable for dividends on the senior preferred stock could be substantial and will have an adverse impact on our financial position and net worth. To the extent we draw on Treasury’s funding commitment, the liquidation preference of the senior preferred stock is increased by the amount of funds we receive. The senior preferred stock is senior in liquidation preference to our common stock and all other series of preferred stock.
	In addition to the issuance of the senior preferred stock and warrant, we are required under the Purchase Agreement to pay a quarterly commitment fee to Treasury. Under the Purchase Agreement, the fee is to be determined in an amount mutually agreed to by us and Treasury with reference to the market value of Treasury’s funding commitment as then in effect. However, pursuant to the August 2012 amendment to the Purchase Agreement, for each quarter commencing January 1, 2013, and for as long as the net worth sweep dividend provisions remain in form and content substantially the same, no periodic commitment fee under the Purchase Agreement will be set, accrue or be payable. Treasury had previously waived the fee for all prior quarters.
	Under the Purchase Agreement, our ability to repay the liquidation preference of the senior preferred stock is limited and we will not be able to do so for the foreseeable future, if at all. The aggregate liquidation preference of the senior preferred stock will increase further if we receive additional draws under the Purchase Agreement or if any dividends or quarterly commitment fees payable under the Purchase Agreement are not paid in cash (this quarterly commitment fee has been suspended). We may need to make additional draws in future periods due to a variety of factors that could adversely affect our net worth.
	The Purchase Agreement includes significant restrictions on our ability to manage our business, including limiting the amount of indebtedness we can incur and capping the size of our mortgage-related investments portfolio. While the senior preferred stock is outstanding, we are prohibited from paying dividends (other than on the senior preferred stock) or issuing equity securities without Treasury’s consent.
	The Purchase Agreement has an indefinite term and can terminate only in limited circumstances, which do not include the end of the conservatorship. The Purchase Agreement therefore could continue after the conservatorship ends. However, Treasury's consent is required for a termination of conservatorship other than in connection with receivership. Treasury has the right to exercise the warrant, in whole or in part, at any time on or before September 7, 2028.
	Purchase Agreement Covenants
	The Purchase Agreement provides that, until the senior preferred stock is repaid or redeemed in full, we may not, without the prior written consent of Treasury:
	•	declare or pay any dividend (preferred or otherwise) or make any other distribution with respect to any Freddie Mac equity securities (other than with respect to the senior preferred stock or warrant);
	•	redeem, purchase, retire or otherwise acquire any Freddie Mac equity securities (other than the senior preferred stock or warrant);
	•	sell or issue any Freddie Mac equity securities (other than the senior preferred stock, the warrant and the common stock issuable upon exercise of the warrant and other than as required by the terms of any binding agreement in effect on the date of the Purchase Agreement);
	•	terminate the conservatorship (other than in connection with a receivership);
	•	sell, transfer, lease or otherwise dispose of any assets, other than dispositions for fair market value: (a) to a limited life regulated entity (in the context of a receivership); (b) of assets and properties in the ordinary course of business, consistent with past practice; (c) of assets and properties having fair market value individually or in aggregate less than $250 million in one transaction or a series of related transactions; (d) in connection with our liquidation by a receiver; (e) of cash or cash equivalents for cash or cash equivalents; or (f) to the extent necessary to comply with the covenant described below relating to the reduction of our mortgage-related investments portfolio;
	•	issue any subordinated debt;
	•	enter into a corporate reorganization, recapitalization, merger, acquisition or similar event; or
	•	engage in transactions with affiliates unless the transaction is: (a) pursuant to the Purchase Agreement, the senior preferred stock or the warrant; (b) upon arm’s length terms; or (c) a transaction undertaken in the ordinary course or pursuant to a contractual obligation or customary employment arrangement in existence on the date of the Purchase Agreement.
	The covenants generally also apply to our subsidiaries.
	The Purchase Agreement also requires us to reduce the amount of mortgage assets we own. The Purchase Agreement, as revised in the August 2012 amendment, provides that we could not own mortgage assets with UPB in excess of $650 billion on December 31, 2012 and on December 31 of each year thereafter, may not own mortgage assets with UPB in excess of 85% of the aggregate amount of mortgage assets we are permitted to own as of December 31 of the immediately preceding calendar year, provided that we are not required to own less than $250 billion in mortgage assets. Under the Purchase Agreement, we also may not incur indebtedness that would result in the par value of our aggregate indebtedness exceeding 120% of the amount of mortgage assets we are permitted to own on December 31 of the immediately preceding calendar year. The mortgage asset and indebtedness limitations are determined without giving effect to the changes to the accounting guidance for transfers of financial assets and consolidation of VIEs, under which we consolidated our single-family PC trusts and certain of our Other Guarantee Transactions in our financial statements as of January 1, 2010.
	In addition, the Purchase Agreement provides that we may not enter into any new compensation arrangements or increase amounts or benefits payable under existing compensation arrangements of any named executive officer or other executive officer (as such terms are defined by SEC rules) without the consent of the Director of FHFA, in consultation with the Secretary of the Treasury.
	The Purchase Agreement also provides that, on an annual basis, we are required to deliver a risk management plan to Treasury setting out our strategy for reducing our enterprise-wide risk profile and the actions we will take to reduce the financial and operational risk associated with each of our reportable business segments.
	Warrant Covenants
	The warrant we issued to Treasury includes, among others, the following covenants: (a) our SEC filings under the Exchange Act will comply in all material respects as to form with the Exchange Act and the rules and regulations thereunder; (b) without the prior written consent of Treasury, we may not permit any of our significant subsidiaries to issue capital stock or equity securities, or securities convertible into or exchangeable for such securities, or any stock appreciation rights or other profit participation rights to any person other than Freddie Mac or its wholly-owned subsidiaries; (c) we may not take any action that will result in an increase in the par value of our common stock; (d) unless waived or consented to in writing by Treasury, we may not take any action to avoid the observance or performance of the terms of the warrant and we must take all actions necessary or appropriate to protect Treasury’s rights against impairment or dilution; and (e) we must provide Treasury with prior notice of specified actions relating to our common stock, such as setting a record date for a dividend payment, granting subscription or purchase rights, authorizing a recapitalization, reclassification, merger or similar transaction, commencing a liquidation of the company or any other action that would trigger an adjustment in the exercise price or number or amount of shares subject to the warrant.
	Termination Provisions
	The Purchase Agreement provides that the Treasury’s funding commitment will terminate under any of the following circumstances: (a) the completion of our liquidation and fulfillment of Treasury’s obligations under its funding commitment at that time; (b) the payment in full of, or reasonable provision for, all of our liabilities (whether or not contingent, including mortgage guarantee obligations); and (c) the funding by Treasury of the maximum amount of the commitment under the Purchase Agreement. In addition, Treasury may terminate its funding commitment and declare the Purchase Agreement null and void if a court vacates, modifies, amends, conditions, enjoins, stays or otherwise affects the appointment of the Conservator or otherwise curtails the Conservator’s powers. Treasury may not terminate its funding commitment under the Purchase Agreement solely by reason of our being in conservatorship, receivership or other insolvency proceeding, or due to our financial condition or any adverse change in our financial condition.
	Waivers and Amendments
	The Purchase Agreement provides that most provisions of the agreement may be waived or amended by mutual written agreement of the parties; however, no waiver or amendment of the agreement is permitted that would decrease Treasury’s aggregate funding commitment or add conditions to Treasury’s funding commitment if the waiver or amendment would adversely affect in any material respect the holders of our debt securities or Freddie Mac mortgage guarantee obligations.
	Third-party Enforcement Rights
	In the event of our default on payments with respect to our debt securities or Freddie Mac mortgage guarantee obligations, if Treasury fails to perform its obligations under its funding commitment and if we and/or the Conservator are not diligently pursuing remedies in respect of that failure, the holders of these debt securities or Freddie Mac mortgage guarantee obligations may file a claim in the United States Court of Federal Claims for relief requiring Treasury to fund to us the lesser of: (a) the amount necessary to cure the payment defaults on our debt and Freddie Mac mortgage guarantee obligations; and (b) the lesser of: (i) the deficiency amount; and (ii) the maximum amount of the commitment less the aggregate amount of funding previously provided under the commitment. Any payment that Treasury makes under those circumstances will be treated for all purposes as a draw under the Purchase Agreement that will increase the liquidation preference of the senior preferred stock.
	Impact of Conservatorship and Related Developments on the Mortgage-Related Investments Portfolio
	For purposes of the limit imposed by the Purchase Agreement and FHFA regulation, the UPB of our mortgage-related investments portfolio could not exceed $470 billion at December 31, 2014 and was $408 billion at that date. Our 2014 Retained Portfolio Plan provides for us to manage the UPB of the mortgage-related investments portfolio so that it does not exceed 90% of the annual cap established by the Purchase Agreement (subject to certain exceptions). The annual 15% reduction in our mortgage-related investments portfolio cap until it reaches $250 billion is calculated based on the maximum allowable size of the mortgage-related investments portfolio, rather than the actual UPB of the mortgage-related investments portfolio, as of December 31 of the preceding year. Our ability to acquire and sell mortgage assets is significantly constrained by limitations of the Purchase Agreement and those imposed by FHFA.
	Government Support for our Business
	We receive substantial support from Treasury and FHFA, as our Conservator and regulator, and are dependent upon their continued support in order to continue operating our business. This support includes our ability to access funds from Treasury under the Purchase Agreement, which is critical to: (a) keeping us solvent; (b) allowing us to focus on our primary business objectives under conservatorship; and (c) avoiding the appointment of a receiver by FHFA under statutory mandatory receivership provisions. At September 30, 2014, our assets exceeded our liabilities under GAAP; therefore FHFA did not request a draw on our behalf and, as a result, we did not receive any funding from Treasury under the Purchase Agreement during the three months ended December 31, 2014. Since conservatorship began through December 31, 2014, we have paid cash dividends of $91.0 billion to Treasury at the direction of the Conservator.
	See “NOTE 8: DEBT SECURITIES AND SUBORDINATED BORROWINGS” and “NOTE 11: STOCKHOLDERS’ EQUITY” for more information on the conservatorship and the Purchase Agreement.
	Housing Finance Agency Initiative
	In 2009, we entered into a Memorandum of Understanding with Treasury, FHFA, and Fannie Mae, which sets forth the terms under which Treasury and, as directed by FHFA, we and Fannie Mae, would provide assistance to state and local HFAs so that the HFAs can continue to meet their mission of providing affordable financing for both single-family and multifamily housing. FHFA directed us and Fannie Mae to participate in the HFA initiative on a basis that is consistent with the goals of being commercially reasonable and safe and sound. Treasury’s participation in these assistance initiatives does not affect the amount of funding that Treasury can provide to Freddie Mac under the Purchase Agreement.
	The primary initiatives are as follows:
	•	TCLFP — In December 2009, on a 50-50 pro rata basis, Freddie Mac and Fannie Mae agreed to provide $8.2 billion of credit and liquidity support, including outstanding interest at the date of the guarantee, for variable rate demand obligations, or VRDOs, previously issued by HFAs. This support was provided through the issuance of guarantees, which provide credit enhancement to the holders of such VRDOs and also create an obligation to provide funds to purchase any VRDOs that are put by their holders and are not remarketed. Treasury provided a credit and liquidity backstop on the TCLFP. These guarantees replaced existing liquidity facilities from other providers. The guarantees were scheduled to expire on December 31, 2012. However, Treasury gave TCLFP participants the option to extend their individual TCLFP facilities to December 31, 2015. Certain participants elected to extend their TCLFP facilities to December 2015.
	•	NIBP — In December 2009, on a 50-50 pro rata basis, Freddie Mac and Fannie Mae agreed to issue in total $15.3 billion of partially guaranteed pass-through securities backed by new single-family and certain new multifamily housing bonds issued by HFAs. Treasury purchased all of the pass-through securities issued by Freddie Mac and Fannie Mae. This initiative provided financing for HFAs to issue new housing bonds.
	Treasury will bear the initial losses of principal up to 35% of total principal for these two initiatives combined, and thereafter Freddie Mac and Fannie Mae each will be responsible only for losses of principal on the securities that it issues to the extent that such losses are in excess of 35% of all losses under both initiatives. Treasury will bear all losses of unpaid interest. Under both initiatives, we and Fannie Mae were paid fees at the time bonds were securitized and are also paid ongoing fees for as long as the bonds remain outstanding.
	Related Parties as a Result of Conservatorship
	As a result of our issuance to Treasury of the warrant to purchase shares of our common stock equal to 79.9% of the total number of shares of our common stock outstanding, on a fully diluted basis, we are deemed a related party to the U.S. government. Except for the transactions with Treasury discussed above in “Business Objectives,” “Government Support for our Business” and “Housing Finance Agency Initiative” as well as in “NOTE 8: DEBT SECURITIES AND SUBORDINATED BORROWINGS” and “NOTE 11: STOCKHOLDERS’ EQUITY,” no transactions outside of normal business activities have occurred between us and the U.S. government (or any of its related parties) during the years ended December 31, 2014, 2013 and 2012. In addition, we are deemed related parties with Fannie Mae as both we and Fannie Mae have the same relationships with FHFA and Treasury. All transactions between us and Fannie Mae have occurred in the normal course of business in conservatorship. In October 2013, FHFA announced the formation of Common Securitization Solutions, LLCSM (CSS). CSS is equally-owned by Freddie Mac and Fannie Mae. In connection with the formation of CSS, we entered into a limited liability company agreement with Fannie Mae. For the year ended December 31, 2014, we contributed $43 million of capital to CSS. In November 2014, we and Fannie Mae announced that a chief executive officer has been named for CSS. Additionally, we and Fannie Mae each appointed two executives to the CSS Board of Managers and signed governance and operating agreements for CSS.

Variable_Interest_Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
VARIABLE INTEREST ENTITIES	NOTE 3: VARIABLE INTEREST ENTITIES
	We have interests in various entities that are considered to be VIEs, including securitization trusts we use in our securities issuance process. We are required to evaluate VIEs at inception and on an ongoing basis. When we determine that we are the primary beneficiary of a VIE, we consolidate the assets and liabilities of the trust on our balance sheets. See “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES — Consolidation and Equity Method of Accounting” for more information about VIEs.
	VIEs for which We are the Primary Beneficiary
	See “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES — Securitization Activities through Issuances of Freddie Mac Mortgage-Related Securities” for information on the nature of single-family PC trusts, REMICs and Other Structured Securities, and Other Guarantee Transactions.
	Single-family PC Trusts
	Our single-family PC trusts issue pass-through securities that represent undivided beneficial interests in pools of mortgages held by these trusts. PCs are designed so that we bear the credit risk inherent in the loans underlying the PCs through our guarantee of principal and interest payments on the PCs. The PC holders bear the interest rate or prepayment risk on the mortgage loans and the risk that we will not perform on our obligation as guarantor. For purposes of our consolidation assessments, our evaluation of power and economic exposure with regard to PC trusts focuses on credit risk because we identified the credit performance of the underlying mortgage loans as the activity that most significantly impacts the economic performance of these entities. We have the power to impact the activities related to this risk in our role as guarantor and master servicer.
	Specifically, in our role as master servicer, we establish requirements for how mortgage loans are serviced and what steps are to be taken to mitigate credit losses (e.g., modification, foreclosure). Additionally, in our capacity as guarantor, we have the ability to remove defaulted mortgage loans out of the PC trust to help mitigate credit losses. See “NOTE 5: IMPAIRED LOANS” for further information regarding our removal of mortgage loans out of PC trusts. These powers allow us to direct the activities of the VIE (i.e., the PC trust) that most significantly impact its economic performance. In addition, we determined that our guarantee to each PC trust to provide principal and interest payments obligates us to absorb losses that could potentially be significant to the PC trusts. Accordingly, we concluded that we are the primary beneficiary of our single-family PC trusts.
	At both December 31, 2014 and 2013, we were the primary beneficiary of, and therefore consolidated, single-family PC trusts with assets totaling $1.5 trillion, as measured using the UPB of issued PCs. The assets of each PC trust can be used only to settle obligations of that trust. In connection with many of our PC trusts, we have credit protection in the form of primary mortgage insurance, pool insurance, recourse to lenders, credit risk transfer transactions, and other forms of credit enhancement. We also have credit protection for certain of our PC trusts that issue PCs backed by loans or certificates of federal agencies (such as FHA, VA, and USDA). See “NOTE 4: MORTGAGE LOANS AND LOAN LOSS RESERVES — Credit Protection and Other Forms of Credit Enhancement” for additional information regarding third-party credit enhancements related to our PC trusts.
	REMICs and Other Structured Securities
	REMICs and Other Structured Securities are mortgage-related securities that we issue to third parties. We do not consolidate the trusts that issue these securities unless we hold substantially all of the beneficial interests in the trust and are therefore considered to be the primary beneficiary. We had investments of approximately $1.4 billion and $3.5 billion in UPB, as of December 31, 2014 and 2013, respectively, where we held substantially all the outstanding beneficial interests in the trusts and consolidated them on our balance sheets.
	Other Guarantee Transactions
	In Other Guarantee Transactions, we issue mortgage-related securities to third parties in exchange for non-Freddie Mac mortgage-related securities. The degree to which our involvement with securitization trusts that issue Other Guarantee Transactions provides us with the power to direct the activities that most significantly impact the economic performance of these VIEs (e.g., the ability to direct the servicing of the underlying assets of these entities) and the obligation to absorb losses that could potentially be significant to the VIEs varies by transaction. For all Other Guarantee Transactions, our variable interest in these VIEs represents some form of credit guarantee.
	We consolidate Other Guarantee Transactions when: (a) we have the obligation to absorb credit losses through our financial guarantee; and (b) we also have the ability to direct the loss mitigation activities of the underlying assets, which is the power to direct the activities that most significantly impact the economic performance of these VIEs. We do not consolidate the Other Guarantee Transactions that do not meet these conditions. As a result, we have concluded that we are the primary beneficiary of Other Guarantee Transactions with underlying assets totaling $7.4 billion and $8.9 billion at December 31, 2014 and 2013, respectively.
	VIEs for which We are not the Primary Beneficiary
	The table below presents the carrying amounts and classification of the assets and liabilities recorded on our consolidated balance sheets related to our variable interests in non-consolidated VIEs, as well as our maximum exposure to loss as a result of our involvement with these VIEs. Our involvement with VIEs for which we are not the primary beneficiary generally takes one of two forms: (a) purchasing an investment in these entities; or (b) providing a guarantee to these entities. Our maximum exposure to loss for those VIEs in which we have purchased an investment is calculated as the maximum potential charge that we would recognize in earnings if that investment were to become worthless. This amount does not include other-than-temporary impairments or other write-downs that we previously recognized through earnings. Our maximum exposure to loss for those VIEs for which we have provided a guarantee represents the contractual amounts that could be lost under the guarantees if counterparties or borrowers defaulted, without consideration of possible recoveries under credit enhancement arrangements. We do not believe the maximum exposure to loss disclosed in the table below is representative of the actual loss we are likely to incur, based on our historical loss experience and after consideration of proceeds from related collateral liquidation, including possible recoveries under credit enhancement arrangements.
	Table 3.1 — Variable Interests in VIEs for which We are not the Primary Beneficiary
		31-Dec-14
		Mortgage-Related						Unsecuritized
		Security Trusts						Multifamily
		Freddie  Mac			Non-Freddie Mac			Loans (3)			Other(2)
		Securities(1)			Securities(2)
		(in millions)
	Assets and Liabilities Recorded on our Consolidated Balance Sheets
	Assets:
	Restricted cash and cash equivalents	$	—		$	—		$	—		$	3
	Investments in securities:
	Available-for-sale, at fair value	39,099			65,253			—			—
	Trading, at fair value	17,469			6,282			—			—
	Mortgage loans:
	Held-for-investment, unsecuritized	—			—			40,753			—
	Held-for-sale	—			—			12,368			—
	Accrued interest receivable	236			165			221			7
	Other assets	914			2			369			495
	Liabilities:
	Derivative liabilities, net	—			—			—			(30		)
	Other liabilities	(1,005		)	—			(10		)	(560		)
	Maximum Exposure to Loss	$	87,529		$	69,206		$	53,711		$	10,419
	Total Assets of Non-Consolidated VIEs(4)	$	103,253		$	390,515		$	95,874		$	22,855
		December 31, 2013
		Mortgage-Related						Unsecuritized
		Security Trusts						Multifamily
		Freddie Mac			Non-Freddie Mac			Loans(3)			Other(2)
		Securities(1)			Securities(2)
		(in millions)
	Assets and Liabilities Recorded on our Consolidated Balance Sheets
	Assets:
	Restricted cash and cash equivalents	$	6		$	—		$	8		$	58
	Investments in securities:
	Available-for-sale, at fair value	40,659			84,765			—			—
	Trading, at fair value	9,349			7,414			—			—
	Mortgage loans:
	Held-for-investment, unsecuritized	—			—			50,306			—
	Held-for-sale	—			—			8,727			—
	Accrued interest receivable	232			226			261			7
	Other assets	833			14			407			477
	Liabilities:
	Derivative liabilities, net	(3		)	—			—			(35		)
	Other liabilities	(875		)	(2		)	(12		)	(558		)
	Maximum Exposure to Loss	$	72,072		$	92,559		$	59,710		$	10,415
	Total Assets of Non-Consolidated VIEs(4)	$	84,731		$	506,699		$	105,120		$	23,707
	-1	Freddie Mac securities include our variable interests in single-family multiclass REMICs and Other Structured Securities, multifamily PCs, multifamily Other Structured Securities, and Other Guarantee Transactions that we do not consolidate. Our maximum exposure to loss includes guaranteed UPB of assets held by the non-consolidated VIEs related to multifamily PCs, multifamily Other Structured Securities, and Other Guarantee Transactions. Our maximum exposure to loss on Freddie Mac securities excludes investments in single-family multiclass REMICs and Other Structured Securities, because we already consolidate the collateral of these trusts on our consolidated balance sheets.
	-2	Our maximum exposure to loss for non-Freddie Mac security trusts and certain other VIEs is computed as the carrying amount if the security is classified as trading or the amortized cost if the security is classified as available-for-sale for our investments recorded on our consolidated balance sheets.
	-3	Our maximum exposure to loss includes accrued interest receivable associated with these loans.
	-4	Except for unsecuritized multifamily loans, this represents the UPB of assets held by non-consolidated VIEs using the most current information available. For unsecuritized multifamily loans, this represents the fair value of the property serving as collateral for the loan.
Mortgage-Related Security Trusts
Freddie Mac Securities
Freddie Mac securities related to our variable interests in non-consolidated VIEs primarily consist of our REMICs and Other Structured Securities and Other Guarantee Transactions. At both December 31, 2014 and 2013, our involvement with most of our REMICS and Other Structured Securities as well as certain Other Guarantee Transactions does not provide us with the power to direct the activities that most significantly impact the economic performance of these VIEs. As a result, we hold a variable interest in, but are not the primary beneficiary of those securitization trusts. For non-consolidated REMICs and Other Structured Securities and Other Guarantee Transactions, our investments are primarily included in either available-for-sale securities or trading securities on our consolidated balance sheets. Our investments in these trusts are funded through the issuance of unsecured debt, which is recorded as other debt on our consolidated balance sheets.
Non-Freddie Mac Securities
We invest in a variety of mortgage-related securities issued by third-parties, including non-Freddie Mac agency securities, CMBS, other private-label securities backed by various mortgage-related assets, and obligations of states and political subdivisions. These investments typically represent interests in trusts that consist of a pool of mortgage-related assets and act as vehicles to allow originators to securitize those assets. Securities are structured from the underlying pool of assets to provide for varying degrees of risk, including potential loss from the credit risk and interest-rate risk of the assets. The originators of the financial assets or the underwriters of the securities offering create the trusts and typically own the residual interest in the trust assets. See “NOTE 7: INVESTMENTS IN SECURITIES” for additional information regarding our non-Freddie Mac securities.
We are not generally the primary beneficiary of non-Freddie Mac securities trusts because our investments are passive in nature and do not provide us with the power to direct the activities of the trusts that most significantly impact their economic performance. We were not the primary beneficiary of any significant non-Freddie Mac securities trusts as of December 31, 2014 or 2013. At both December 31, 2014 and 2013, our exposure was limited to the amount of our investment. Our investments in these trusts are funded through the issuance of unsecured debt, which is recorded as other debt on our consolidated balance sheets.
Unsecuritized Multifamily Loans
We purchase loans made to various multifamily real estate entities. We primarily purchase such loans for securitization. The loans we acquire usually are, at origination, equal to 80% or less of the value of the related underlying property. The remaining 20% of value is typically funded through equity contributions by the partners or members of the borrower entity. In a few cases, the 20% not funded through the loan we acquire also includes subordinate loans or mezzanine financing from third-party lenders.
We held more than 4,400 and 5,000 unsecuritized multifamily loans at December 31, 2014 and 2013, respectively. The UPB of our investments in these loans was $53.0 billion and $59.2 billion as of December 31, 2014 and 2013, respectively, and was included in unsecuritized held-for-investment mortgage loans, at amortized cost, and held-for-sale mortgage loans at fair value on our consolidated balance sheets. We are not generally the primary beneficiary of the multifamily real estate borrowing entities because the loans we acquire are passive in nature and do not provide us with the power to direct the activities of these entities that most significantly impact their economic performance. However, when a multifamily loan becomes delinquent, we may become the primary beneficiary of the borrowing entity depending upon the structure of this entity and the rights granted to us under the governing legal documents. At both December 31, 2014 and 2013, the amount of unsecuritized multifamily loans for which we could be considered the primary beneficiary of the underlying borrowing entity was not material. See “NOTE 4: MORTGAGE LOANS AND LOAN LOSS RESERVES” for more information.
Other
Our involvement with other VIEs primarily includes certain of our other mortgage-related guarantees and other guarantee commitments that we account for as derivatives.
At December 31, 2014 and 2013, we were the primary beneficiary of zero and one, respectively, real estate entities that invest in multifamily property, related to credit-enhanced multifamily housing revenue bonds that were not deemed to be material. We were not the primary beneficiary of the remainder of other VIEs because our involvement in these VIEs is passive in nature and does not provide us with the power to direct the activities of the VIEs that most significantly impact their economic performance. See “Table 3.1 — Variable Interests in VIEs for which We are not the Primary Beneficiary” for the carrying amounts and classification of the assets and liabilities recorded on our consolidated balance sheets related to our other variable interests in non-consolidated VIEs, as well as our maximum exposure to loss as a result of our involvement with these VIEs.
Non-Cash Investing and Financing Activities
We consolidate certain of our multiclass REMIC and Other Structured Securities trusts when we hold substantially all of the beneficial interests issued by the trust. Upon consolidation of a multiclass REMIC and Other Structured Securities trust, we derecognize our investments in the beneficial interests issued by the trust and recognize the assets and liabilities of the trust at fair value. During the years ended December 31, 2014, 2013, and 2012, this activity resulted in a decrease in investment securities and a decrease in debt securities of consolidated trusts of $0.4 billion, $2.2 billion, and $4.6 billion, respectively.

Mortgage_Loans_and_Loan_Loss_R

Mortgage Loans and Loan Loss Reserves	12 Months Ended
	Dec. 31, 2014
Mortgage Loans on Real Estate [Abstract]
MORTGAGE LOANS AND LOAN LOSS RESERVES	NOTE 4: MORTGAGE LOANS AND LOAN LOSS RESERVES
	We own both single-family mortgage loans, which are secured by one to four unit residential properties, and multifamily mortgage loans, which are secured by properties with five or more residential rental units. Our single-family loans are predominantly first lien, fixed-rate mortgages secured by the borrower’s primary residence. For a discussion of our significant accounting policies regarding our mortgage loans and loan loss reserves, see “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES."
	The table below summarizes the types of loans on our consolidated balance sheets as of December 31, 2014 and 2013.
	Table 4.1 — Mortgage Loans
		31-Dec-14									31-Dec-13
		Unsecuritized			Held By			Total			Unsecuritized			Held By			Total
					Consolidated									Consolidated
					Trusts									Trusts
		(in millions)
	Single-family:
	Fixed-rate
	Amortizing	$	105,560		$	1,431,872		$	1,537,432		$	113,597		$	1,402,841		$	1,516,438
	Interest-only	939			3,298			4,237			1,476			4,826			6,302
	Total fixed-rate	106,499			1,435,170			1,541,669			115,073			1,407,667			1,522,740
	Adjustable-rate
	Amortizing	1,353			68,632			69,985			1,935			65,429			67,364
	Interest-only	3,191			20,373			23,564			4,576			23,841			28,417
	Total adjustable-rate	4,544			89,005			93,549			6,511			89,270			95,781
	Other Guarantee Transactions	—			7,042			7,042			—			8,431			8,431
	FHA/VA and other governmental	473			3,139			3,612			553			3,354			3,907
	Total single-family	111,516			1,534,356			1,645,872			122,137			1,508,722			1,630,859
	Multifamily:
	Fixed-rate	43,632			524			44,156			50,701			444			51,145
	Adjustable-rate	9,321			—			9,321			8,467			—			8,467
	Other governmental	3			—			3			3			—			3
	Total multifamily	52,956			524			53,480			59,171			444			59,615
	Total UPB of mortgage loans	164,472			1,534,880			1,699,352			181,308			1,509,166			1,690,474
	Deferred fees, unamortized premiums, discounts and other cost basis adjustments	(3,366		)	26,098			22,732			(4,817		)	23,745			18,928
	Fair value adjustments on loans held-for sale	257			—			257			6			—			6
	Allowance for loan losses on mortgage loans held-for-investment	(18,877		)	(2,884		)	(21,761		)	(21,612		)	(3,006		)	(24,618		)
	Total mortgage loans, net	$	142,486		$	1,558,094		$	1,700,580		$	154,885		$	1,529,905		$	1,684,790
	Mortgage loans, net:
	Held-for-investment	$	130,118		$	1,558,094		$	1,688,212		$	146,158		$	1,529,905		$	1,676,063
	Held-for-sale	12,368			—			12,368			8,727			—			8,727
	Total mortgage loans, net	$	142,486		$	1,558,094		$	1,700,580		$	154,885		$	1,529,905		$	1,684,790
	During 2014 and 2013, we purchased $252.7 billion and $412.9 billion, respectively, in UPB of single-family mortgage loans, and $2.4 billion and $1.3 billion, respectively, in UPB of multifamily loans that were classified as held-for-investment.
	Our sales of multifamily mortgage loans occur primarily through the issuance of multifamily K Certificates, which we categorize as Other Guarantee Transactions. During 2014 and 2013, we sold $21.3 billion and $28.3 billion, respectively, of held-for-sale multifamily mortgage loans. See “NOTE 14: FINANCIAL GUARANTEES” for more information on our issuances of Other Guarantee Transactions.
	In April 2014, we received FHFA's approval for a pilot transaction to sell certain seriously delinquent unsecuritized single-family loans held on our consolidated balance sheet. In connection with this transaction, during the second quarter of 2014, we reclassified $0.9 billion in recorded investment of mortgage loans from held-for-investment to held-for-sale. We subsequently reclassified certain of these loans back to held-for-investment during the second and third quarters of 2014. We completed the sale in the third quarter of 2014. In January 2015, we received FHFA approval to execute additional such sales. In connection with this approval, we reclassified $1.4 billion in recorded investment of mortgage loans from held-for-investment to held-for-sale during the first quarter of 2015, which did not have a material effect on our financial results. For additional information regarding the fair value of our loans classified as held-for-sale, see "NOTE 16: FAIR VALUE DISCLOSURES."
	Credit Quality of Mortgage Loans
	We evaluate the credit quality of single-family loans using different criteria than the criteria we use to evaluate multifamily loans. The current LTV ratio is one key factor we consider when estimating our loan loss reserves for single-family loans. As estimated current LTV ratios increase, the borrower’s equity in the home decreases, which negatively affects the borrower’s ability to refinance (outside of HARP) or to sell the property for an amount at or above the balance of the outstanding mortgage loan. A second-lien mortgage also reduces the borrower’s equity in the home, and has a similar negative effect on the borrower’s ability to refinance or sell the property for an amount at or above the combined balances of the first and second mortgages. As of both December 31, 2014 and 2013, based on data collected by us at loan delivery, approximately 14% of loans in our single-family credit guarantee portfolio had second-lien financing by third parties at origination of the first mortgage. However, borrowers are free to obtain second-lien financing after origination, and we are not entitled to receive notification when a borrower does so. Therefore, it is likely that additional borrowers have post-origination second-lien mortgages. For further information about concentrations of risk associated with our single-family and multifamily mortgage loans, see “NOTE 15: CONCENTRATION OF CREDIT AND OTHER RISKS.”
	We have discontinued our purchases of Alt-A, interest-only, and option ARM loans. For reporting purposes: (a) loans within the Alt-A category continue to be presented in that category following modification, even though the borrower may have provided full documentation of assets and income to complete the modification; and (b) loans within the option ARM category continue to be presented in that category following modification, even though the modified loan no longer provides for optional payment provisions.
	The table below presents information on the estimated current LTV ratios of single-family held-for-investment loans on our consolidated balance sheets. Our current LTV ratio estimates are based on available data through the end of each respective period presented.
	Table 4.2 — Recorded Investment of Held-For-Investment Mortgage Loans, by LTV Ratio
		As of December 31, 2014												As of December 31, 2013
		Estimated Current LTV Ratio(1)												Estimated Current LTV Ratio(1)
		≤ 80			> 80 to 100			> 100(2)			Total			≤ 80			> 80 to 100			> 100(2)			Total
		(in millions)
	Single-family loans:
	20 and 30-year or more, amortizing fixed-rate(3)	$	911,071		$	258,126		$	85,398		$	1,254,595		$	819,509		$	269,110		$	124,491		$	1,213,110
	15-year amortizing fixed-rate(3)	265,098			14,101			3,338			282,537			270,211			19,658			5,748			295,617
	Adjustable-rate	60,463			6,701			709			67,873			56,208			6,714			1,578			64,500
	Alt-A, interest-only, and option ARM	28,935			18,232			16,448			63,615			29,927			21,564			25,089			76,580
	Total single-family loans	$	1,265,567		$	297,160		$	105,893		1,668,620			$	1,175,855		$	317,046		$	156,906		1,649,807
	Multifamily loans										41,353												50,874
	Total recorded investment of held-for-investment loans										$	1,709,973											$	1,700,681
	-1	The current LTV ratios are management estimates, which are updated on a monthly basis. Market values are estimated by adjusting the value of the property at origination based on changes in the market value of homes in the same geographic area since that time. Changes in market value are derived from our internal index which measures price changes for repeat sales and refinancing activity on the same properties using Freddie Mac and Fannie Mae single-family mortgage acquisitions, including foreclosure sales. Estimates of the current LTV ratio include the credit-enhanced portion of the loan and exclude any secondary financing by third parties.
	-2	The serious delinquency rate for the total of single-family held-for-investment mortgage loans with estimated current LTV ratios in excess of 100% was 9.01% and 9.89% as of December 31, 2014 and 2013, respectively.
	-3	The majority of our loan modifications result in new terms that include fixed interest rates after modification. As of December 31, 2014 and 2013, we have categorized UPB of approximately $42.3 billion and $43.8 billion, respectively, of modified loans as fixed-rate loans (instead of as adjustable rate loans), even though the modified loans have rate adjustment provisions. In these cases, while the terms of the modified loans provide for the interest rate to adjust in the future, such future rates are determined at the time of modification rather than at a subsequent date.
	For information about the payment status of single-family and multifamily mortgage loans, including the amount of such loans we deem impaired, see “NOTE 5: IMPAIRED LOANS.” For a discussion of certain indicators of credit quality for the multifamily loans on our consolidated balance sheets, see “NOTE 15: CONCENTRATION OF CREDIT AND OTHER RISKS — Multifamily Mortgage Portfolio.”
	Allowance for Loan Losses and Reserve for Guarantee Losses, or Loan Loss Reserves
	Our loan loss reserves consist of our: (a) allowance for loan losses on mortgage loans that we classify as held-for-investment on our consolidated balance sheets; and (b) reserve for guarantee losses associated with Freddie Mac mortgage-related securities backed by multifamily loans, certain single-family Other Guarantee Transactions, and other guarantee commitments, for which we have incremental credit risk.
	A significant portion of the unsecuritized single-family loans on our consolidated balance sheets are seriously delinquent and/or TDR loans that we previously removed from our PC pools. These seriously delinquent and TDR loans typically have a higher associated allowance for loan loss than loans that remain in consolidated trusts.
	The table below presents our loan loss reserves activity for the single-family and multifamily loans that we own or guarantee.
	Table 4.3 — Detail of Loan Loss Reserves
	Year Ended December 31,
	2014												2013
	Allowance for Loan Losses						Reserve  for						Allowance for Loan Losses						Reserve  for
							Guarantee												Guarantee
	Unsecuritized			Held By			Losses			Total			Unsecuritized			Held By			Losses			Total
				Consolidated												Consolidated
				Trusts												Trusts
	(in millions)
Single-family:
Beginning balance	$	21,487		$	3,006		$	85		$	24,578		$	25,449		$	4,918		$	141		$	30,508
Provision (benefit) for credit losses	(864		)	947			30			113			(3,995		)	1,790			(42		)	(2,247		)
Charge-offs	(4,510		)	(376		)	(6		)	(4,892		)	(8,181		)	(804		)	(10		)	(8,995		)
Recoveries	998			260			—			1,258			3,810			503			—			4,313
Transfers, net(1)	1,689			(953		)	—			736			4,404			(3,401		)	(4		)	999
Ending balance	$	18,800		$	2,884		$	109		$	21,793		$	21,487		$	3,006		$	85		$	24,578
Multifamily:
Beginning balance	$	125		$	—		$	26		$	151		$	339		$	1		$	42		$	382
Provision (benefit) for credit losses	(46		)	—			(9		)	(55		)	(208		)	(1		)	(9		)	(218		)
Charge-offs	(3		)	—			—			(3		)	(7		)	—			—			(7		)
Recoveries	1			—			—			1			1			—			—			1
Transfers, net(1)	—			—			—			—			—			—			(7		)	(7		)
Ending balance	$	77		$	—		$	17		$	94		$	125		$	—		$	26		$	151
Total:
Beginning balance	$	21,612		$	3,006		$	111		$	24,729		$	25,788		$	4,919		$	183		$	30,890
Provision (benefit) for credit losses	(910		)	947			21			58			(4,203		)	1,789			(51		)	(2,465		)
Charge-offs	(4,513		)	(376		)	(6		)	(4,895		)	(8,188		)	(804		)	(10		)	(9,002		)
Recoveries	999			260			—			1,259			3,811			503			—			4,314
Transfers, net(1)	1,689			(953		)	—			736			4,404			(3,401		)	(11		)	992
Ending balance	$	18,877		$	2,884		$	126		$	21,887		$	21,612		$	3,006		$	111		$	24,729
Ratio of total loan loss reserves (excluding TDR concessions) to net charge-offs for single-family loans(2)										2.5												1.9
Ratio of total loan loss reserves to net charge-offs for single-family loans(2)										5.2												3.5
-1	For the years ended December 31, 2014 and 2013, consists of: (a) approximately $1.0 billion and $3.4 billion, respectively, of reclassified single-family reserves related to our removal of loans previously held by consolidated trusts, net of reclassifications for single-family loans subsequently resecuritized after such removal; and (b) approximately $0.7 billion and $1.0 billion, respectively, attributable to capitalization of past due interest on modified mortgage loans.
-2	Excludes amounts associated with loans acquired with deteriorated credit quality (at the time of our acquisition) and recoveries related to settlements.
The table below presents our allowance for loan losses and our recorded investment in mortgage loans, held-for-investment, by impairment evaluation methodology.
Table 4.4 — Net Investment in Mortgage Loans
	31-Dec-14									31-Dec-13
	Single-family			Multifamily			Total			Single-family			Multifamily			Total
	(in millions)
Recorded investment:
Collectively evaluated	$	1,568,237		$	40,451		$	1,608,688		$	1,551,667		$	49,598		$	1,601,265
Individually evaluated	100,383			902			101,285			98,140			1,276			99,416
Total recorded investment	1,668,620			41,353			1,709,973			1,649,807			50,874			1,700,681
Ending balance of the allowance for loan losses:
Collectively evaluated	(3,847		)	(25		)	(3,872		)	(5,939		)	(45		)	(5,984		)
Individually evaluated	(17,837		)	(52		)	(17,889		)	(18,554		)	(80		)	(18,634		)
Total ending balance of the allowance	(21,684		)	(77		)	(21,761		)	(24,493		)	(125		)	(24,618		)
Net investment in mortgage loans	$	1,646,936		$	41,276		$	1,688,212		$	1,625,314		$	50,749		$	1,676,063
A significant number of unsecuritized single-family mortgage loans on our consolidated balance sheets are individually evaluated for impairment while substantially all single-family mortgage loans held by our consolidated trusts are collectively evaluated for impairment. The ending balance of the allowance for loan losses associated with our held-for-investment unsecuritized mortgage loans represented approximately 12.7% and 12.9% of the recorded investment in such loans at December 31, 2014 and 2013, respectively, and a substantial portion of the allowance associated with these loans represented interest rate concessions provided to borrowers as part of loan modifications. The ending balance of the allowance for loan losses associated with mortgage loans held by our consolidated trusts represented approximately 0.2% of the recorded investment in such loans as of both December 31, 2014 and 2013.
Credit Protection and Other Forms of Credit Enhancement
In connection with many of our mortgage loans and other mortgage-related guarantees, we have credit protection in the form of primary mortgage insurance, pool insurance, recourse to lenders, credit risk transfer transactions, and other forms of credit enhancements.
The table below presents the UPB of loans on our consolidated balance sheets or underlying our financial guarantees with credit protection and the maximum amounts of potential loss recovery by type of credit protection.
Table 4.5 — Recourse and Other Forms of Credit Protection(1)
	UPB at						Maximum Coverage(2) at
	31-Dec-14			31-Dec-13			31-Dec-14			31-Dec-13
	(in millions)
Single-family:
Primary mortgage insurance	$	227,495		$	203,470		$	57,938		$	50,823
Other credit protection:
Credit risk transfer transactions(3)	144,272			56,903			6,657			1,183
Lender recourse and indemnifications	6,527			7,119			6,092			6,726
Pool insurance(4)	2,284			4,683			947			1,186
HFA indemnification	3,357			4,051			3,324			3,323
Subordination(5)	2,377			2,644			339			399
Other credit enhancements	20			38			18			38
Total	$	386,332		$	278,908		$	75,315		$	63,678
Multifamily:
K Certificates	$	75,541		$	59,326		$	13,576		$	10,601
Subordination(5)	4,724			4,435			796			756
HFA indemnification	772			905			699			699
Other credit enhancements	5,706			6,666			1,685			1,834
Total	$	86,743		$	71,332		$	16,756		$	13,890
-1	Except for our credit risk transfer transactions, our credit enhancements generally provide protection for the first, or initial credit losses associated with the related loans. Excludes: (a) FHA/VA and other governmental loans; (b) purchased credit protection associated with $9.8 billion and $11.5 billion in UPB of single-family loans underlying Other Guarantee Transactions as of December 31, 2014 and 2013, respectively; and (c) repurchase rights (subject to certain conditions and limitations) we have under representations and warranties provided by our agreements with seller/servicers to underwrite loans and service them in accordance with our standards.
-2	Except for subordination and K Certificates, this represents the remaining amount of loss recovery that is available subject to terms of counterparty agreements. For subordination and K Certificates coverage, this represents the UPB of the securities that are subordinate to our guarantee, which could provide protection by absorbing first losses.
-3	Excludes $48.3 billion in UPB at December 31, 2014 where the related loans are also covered by primary mortgage insurance. Maximum coverage amounts presented represent the outstanding balance of STACR debt securities held by third parties as well as the remaining aggregate limit of insurance purchased from third parties in ACIS transactions.
-4	Excludes approximately $0.9 billion and $1.8 billion in UPB at December 31, 2014 and 2013, respectively, where the related loans are also covered by primary mortgage insurance.
-5	Represents Freddie Mac issued mortgage-related securities with subordination protection, excluding multifamily K Certificates and those securities backed by state and local HFA bonds related to the HFA initiative.
Primary mortgage insurance is the most prevalent type of credit enhancement protecting our single-family credit guarantee portfolio, and is provided on a loan-level basis. Pool insurance contracts provide insurance on a group of mortgage loans up to a stated aggregate loss limit. We have not purchased pool insurance on single-family loans since March 2008. For information about counterparty risk associated with mortgage insurers, see “NOTE 15: CONCENTRATION OF CREDIT AND OTHER RISKS — Mortgage Insurers.”
Our credit risk transfer transactions include structured agency credit risk (STACR) debt note transactions and agency credit insurance structures (ACIS), and provide credit enhancement by transferring a portion of credit losses on single-family loans that could occur under adverse home price scenarios. In a STACR debt note transaction, we create a reference pool consisting of a large group of recently acquired single-family mortgage loans. We then create a hypothetical securitization structure with notional credit risk positions, or tranches (e.g., first loss, mezzanine, and senior). We issue STACR debt notes that relate to the mezzanine tranches, though the notes are not backed or collateralized by mortgage loans in the reference pool. The principal balance of the STACR debt notes is reduced (based on a fixed severity schedule) when certain specified credit events (such as a loan becoming 180 days delinquent) occur on the loans in the reference pool. In turn, this may reduce the total amount of payments we ultimately make on the STACR debt notes. We retained the first loss position for loans covered by STACR transactions completed in 2014 and 2013. We executed seven and two STACR debt note transactions in 2014 and 2013, respectively.
In an ACIS transaction, we purchase one or more insurance policies (typically underwritten by a panel of insurers and reinsurers) that obligate the counterparties to reimburse us for specified credit events (based on a fixed severity schedule up to an aggregate limit) that are incurred on our mezzanine loss positions associated with STACR debt note transactions in exchange for our payment of periodic premiums. We executed three and one ACIS transactions during 2014 and 2013, respectively.
We also have credit enhancements protecting our multifamily mortgage portfolio. Subordination, primarily through our K Certificates, is the most prevalent type, whereby we mitigate our credit risk exposure by structuring our securities to sell the expected credit risk to private investors who purchase the subordinate tranches.
We also have credit protection for certain mortgage loans on our consolidated balance sheets that are covered by insurance or partial guarantees issued by federal agencies (such as FHA, VA, and USDA). The total UPB of these loans was $3.6 billion and $3.9 billion as of December 31, 2014 and 2013, respectively.
Non-Cash Investing and Financing Activities
During the years ended December 31, 2014, 2013, and 2012, we acquired $187.1 billion, $340.9 billion, and $358.1 billion, respectively, of mortgage loans held-for-investment in exchange for the issuance of debt securities of consolidated trusts.

Impaired_Loans

Impaired Loans	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
IMPAIRED LOANS	NOTE 5: IMPAIRED LOANS
	Individually Impaired Loans
	Individually impaired single-family loans include TDRs, as well as loans acquired under our financial guarantees with deteriorated credit quality. Individually impaired multifamily loans include TDRs, loans three monthly payments or more past due, and loans that are impaired based on management judgment. For a discussion of our significant accounting policies regarding impaired and non-accrual mortgage loans, see “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES.”
	Total loan loss reserves consist of a specific valuation allowance related to individually impaired mortgage loans, and a general reserve for other probable incurred losses. Our recorded investment in individually impaired mortgage loans and the related specific valuation allowance are summarized in the table below by product class (for single-family loans).
	Table 5.1 — Individually Impaired Loans
			Balance at December 31, 2014															For the Year Ended December 31, 2014
			UPB				Recorded				Associated				Net			Average			Interest		Interest Income
							Investment				Allowance				Investment			Recorded			Income		Recognized
																		Investment			Recognized		On Cash Basis(1)
			(in millions)
	Single-family —
	With no specific allowance recorded(2):
	20 and 30-year or more, amortizing fixed-rate		$	6,041			$	4,007			N/A				$	4,007		$	3,727		$	376	$	33
	15-year amortizing fixed-rate		63				44				N/A				44			39			10		1
	Adjustable-rate		27				22				N/A				22			17			1		—
	Alt-A, interest-only, and option ARM		1,717				1,168				N/A				1,168			1,133			81		6
	Total with no specific allowance recorded		7,848				5,241				N/A				5,241			4,916			468		40
	With specific allowance recorded:(3)
	20 and 30-year or more, amortizing fixed-rate		77,798				76,708				$	(14,051	)		62,657			75,773			2,357		279
	15-year amortizing fixed-rate		1,226				1,233				(40		)		1,193			1,242			54		10
	Adjustable-rate		868				866				(65		)		801			881			23		6
	Alt-A, interest-only, and option ARM		16,734				16,335				(3,681		)		12,654			16,476			380		58
	Total with specific allowance recorded		96,626				95,142				(17,837		)		77,305			94,372			2,814		353
	Combined single-family:
	20 and 30-year or more, amortizing fixed-rate		83,839				80,715				(14,051		)		66,664			79,500			2,733		312
	15-year amortizing fixed-rate		1,289				1,277				(40		)		1,237			1,281			64		11
	Adjustable-rate		895				888				(65		)		823			898			24		6
	Alt-A, interest-only, and option ARM		18,451				17,503				(3,681		)		13,822			17,609			461		64
	Total single-family		$	104,474			$	100,383			$	(17,837	)		$	82,546		$	99,288		$	3,282	$	393
	Multifamily —
	With no specific allowance recorded(4)		$	440			$	431			N/A				$	431		$	659		$	29	$	9
	With specific allowance recorded		480				471				$	(52	)		419			535			26		16
	Total multifamily		$	920			$	902			$	(52	)		$	850		$	1,194		$	55	$	25
	Total single-family and multifamily		$	105,394			$	101,285			$	(17,889	)		$	83,396		$	100,482		$	3,337	$	418
			Balance at December 31, 2013															For the Year Ended December 31, 2013
			UPB				Recorded Investment				Associated				Net			Average			Interest		Interest Income
											Allowance				Investment			Recorded			Income		Recognized
																		Investment			Recognized		On Cash Basis(1)
		(in millions)
	Single-family —
	With no specific allowance recorded(2):
	20 and 30-year or more, amortizing fixed-rate		$	5,927			$	3,355			N/A				$	3,355		$	3,370		$	394	$	34
	15-year amortizing fixed-rate		62				34				N/A				34			31			6		1
	Adjustable rate		19				13				N/A				13			13			1		—
	Alt-A, interest-only, and option ARM		1,758				1,038				N/A				1,038			978			72		6
	Total with no specific allowance recorded		7,766				4,440				N/A				4,440			4,392			473		41
	With specific allowance recorded:(3)
	20 and 30-year or more, amortizing fixed-rate		75,633				74,554				$	(14,431	)		60,123			69,922			2,127		282
	15-year amortizing fixed-rate		1,324				1,324				(43		)		1,281			1,109			50		11
	Adjustable rate		967				962				(84		)		878			855			22		6
	Alt-A, interest-only, and option ARM		17,210				16,860				(3,996		)		12,864			16,526			369		69
	Total with specific allowance recorded		95,134				93,700				(18,554		)		75,146			88,412			2,568		368
	Combined single-family:
	20 and 30-year or more, amortizing fixed-rate		81,560				77,909				(14,431		)		63,478			73,292			2,521		316
	15-year amortizing fixed-rate		1,386				1,358				(43		)		1,315			1,140			56		12
	Adjustable rate		986				975				(84		)		891			868			23		6
	Alt-A, interest-only, and option ARM		18,968				17,898				(3,996		)		13,902			17,504			441		75
	Total single-family		$	102,900			$	98,140			$	(18,554	)		$	79,586		$	92,804		$	3,041	$	409
	Multifamily —
	With no specific allowance recorded(4)		$	694			$	681			N/A				$	681		$	1,108		$	48	$	20
	With specific allowance recorded		608				595				$	(80	)		515			891			41		31
	Total multifamily		$	1,302			$	1,276			$	(80	)		$	1,196		$	1,999		$	89	$	51
	Total single-family and multifamily		$	104,202			$	99,416			$	(18,634	)		$	80,782		$	94,803		$	3,130	$	460
	-1	Consists of income recognized during the period related to loans on non-accrual status.
-2	Individually impaired single-family loans with no specific related valuation allowance primarily represent mortgage loans removed from PC pools and accounted for in accordance with the accounting guidance for loans and debt securities acquired with deteriorated credit quality that have not experienced further deterioration.
-3	Consists primarily of mortgage loans classified as TDRs.
-4	Individually impaired multifamily loans with no specific related valuation allowance primarily represent those loans for which the collateral value is sufficiently in excess of the loan balance to result in recovery of the entire recorded investment if the property were foreclosed upon or otherwise subject to disposition.
Mortgage Loan Performance
The table below presents the recorded investment of our single-family and multifamily mortgage loans, held-for-investment, by payment status.
Table 5.2 — Payment Status of Mortgage Loans
	31-Dec-14
	Current				One				Two				Three Months or			Total			Non-accrual
					Month				Months				More Past Due,
					Past Due				Past Due				or in Foreclosure
	(in millions)
Single-family:
20 and 30-year or more, amortizing fixed-rate	$	1,207,826			$	17,516			$	5,817			$	23,436		$	1,254,595		$	23,433
15-year amortizing fixed-rate	280,629				1,010				216				682			282,537			682
Adjustable-rate	66,737				406				118				612			67,873			612
Alt-A, interest-only, and option ARM	53,251				2,368				948				7,048			63,615			7,045
Total single-family	1,608,443				21,300				7,099				31,778			1,668,620			31,772
Total multifamily	41,335				7				11				—			41,353			385
Total single-family and multifamily	$	1,649,778			$	21,307			$	7,110			$	31,778		$	1,709,973		$	32,157
	December 31, 2013
	Current				One				Two				Three Months or			Total			Non-accrual
					Month				Months				More Past Due,
					Past Due				Past Due				or in Foreclosure
	(in millions)
Single-family:
20 and 30-year or more, amortizing fixed-rate	$	1,157,057			$	19,743			$	6,675			$	29,635		$	1,213,110		$	29,620
15-year amortizing fixed-rate	293,286				1,196				271				864			295,617			863
Adjustable-rate	62,987				495				147				871			64,500			871
Alt-A, interest-only, and option ARM	62,356				2,898				1,157				10,169			76,580			10,162
Total single-family	1,575,686				24,332				8,250				41,539			1,649,807			41,516
Total multifamily	50,827				—				21				26			50,874			627
Total single-family and multifamily	$	1,626,513			$	24,332			$	8,271			$	41,565		$	1,700,681		$	42,143
We have the option under our PC master trust agreement to remove mortgage loans that underlie our PCs under certain circumstances to resolve an existing or impending delinquency or default. Our practice generally has been to remove loans from PC trusts when the loans have been delinquent for 120 days or more. As of December 31, 2014, there were $0.8 billion in UPB of loans underlying our PCs that were 120 days or more delinquent, and that met our criteria for removing the loan from the PC trust. Generally, we remove these delinquent loans from the PC trust, and thereby extinguish the related PC debt at the next scheduled PC payment date, unless the loans proceed to foreclosure transfer, complete a foreclosure alternative or are paid in full by the borrower before such date.
When we remove mortgage loans from PC trusts, we reclassify the loans from mortgage loans held-for-investment by consolidated trusts to unsecuritized mortgage loans held-for-investment and record an extinguishment of the corresponding portion of the debt securities of the consolidated trusts. We removed $11.2 billion and $18.2 billion in UPB of loans from PC trusts (or purchased delinquent loans associated with other guarantee commitments) during the years ended December 31, 2014 and 2013, respectively.
The table below summarizes the delinquency rates of mortgage loans within our single-family credit guarantee and multifamily mortgage portfolios.
Table 5.3 — Delinquency Rates
	31-Dec-14				31-Dec-13
Single-family:(1)
Non-credit-enhanced portfolio
Serious delinquency rate	1.74		%		2.09		%
Total number of seriously delinquent loans	150,300				190,119
Credit-enhanced portfolio:(2)
Primary mortgage insurance:
Serious delinquency rate	3.1		%		4.4		%
Total number of seriously delinquent loans	38,595				51,600
Other credit protection:(3)
Serious delinquency rate	1.21		%		3.66		%
Total number of seriously delinquent loans	12,175				15,828
Total single-family:
Serious delinquency rate	1.88		%		2.39		%
Total number of seriously delinquent loans	200,069				255,325
Multifamily:(4)
Non-credit-enhanced portfolio:
Delinquency rate	0.02		%		0.07		%
UPB of delinquent loans (in millions)	$	11			$	46
Credit-enhanced portfolio:
Delinquency rate	0.05		%		0.11		%
UPB of delinquent loans (in millions)	$	44			$	75
Total Multifamily:
Delinquency rate	0.04		%		0.09		%
UPB of delinquent loans (in millions)	$	55			$	121
-1	Serious delinquencies on single-family mortgage loans underlying certain REMICs and Other Structured Securities, Other Guarantee Transactions, and other guarantee commitments may be reported on a different schedule due to variances in industry practice. In the third quarter of 2014, we revised our presentation of single-family non-credit enhanced and credit-enhanced serious delinquency rates. This revision did not impact our total single-family serious delinquency rate. Prior periods have been revised to conform with the current presentation.
-2	The credit enhanced categories are not mutually exclusive as a single loan may be covered by both primary mortgage insurance and other credit protection.
-3	Consists of single-family mortgage loans covered by financial arrangements (other than primary mortgage insurance) that are designed to reduce our credit risk exposure. See "Table 4.5 — Recourse and Other Forms of Credit Protection" for more information.
-4	Multifamily delinquency performance is based on UPB of mortgage loans that are two monthly payments or more past due or those in the process of foreclosure and includes multifamily Other Guarantee Transactions (e.g., K Certificates).
We continue to implement a number of initiatives to refinance and modify loans, including the MHA Program and the servicing alignment initiative. Our implementation of the MHA Program, for our loans, includes the following: (a) an initiative to allow mortgages currently owned or guaranteed by us to be refinanced without obtaining additional credit enhancement beyond that already in place for the loan (i.e., our relief refinance mortgage, which is our implementation of HARP); (b) an initiative to modify mortgages for both homeowners who are in default and those who are at risk of imminent default (i.e., HAMP); and (c) an initiative designed to permit borrowers who meet basic HAMP eligibility requirements to sell their homes in short sales or to complete a deed in lieu of foreclosure transaction. As part of accomplishing certain of these initiatives, we pay various incentives to servicers and borrowers. Except as described below, we bear the full costs associated with these loan workout and foreclosure alternatives on mortgages that we own or guarantee, including the cost of any monthly payment reductions, and do not receive any reimbursement from Treasury. In addition, in January 2015, at the instruction of FHFA, we implemented a new $5,000 principal reduction incentive payable to eligible borrowers who remain in good standing on their HAMP modified loans through the sixth anniversary of their modification. Treasury will pay the $5,000 incentive for certain of our eligible HAMP modified loans, and we will pay the $5,000 incentive on our other eligible HAMP modified loans.
HAMP and HARP are scheduled to end in December 2015. In June 2014, Treasury announced that HAMP would be extended for at least another year. However, it is still not known if FHFA will direct us to extend our version of HAMP as well.
Troubled Debt Restructurings
Single-Family TDRs
We require our single-family servicers to contact borrowers who are in default and to evaluate loan workout options in accordance with our requirements. We establish guidelines for our servicers to follow and provide them default management programs designed to help them manage non-performing loans more effectively and to assist borrowers in maintaining home ownership, or facilitate foreclosure alternatives when continued homeownership is not practicable. We require our single-family servicers first to evaluate problem loans for a repayment or forbearance plan before considering modification. If a borrower is not eligible for a modification, our seller/servicers pursue other workout options before considering foreclosure. We receive information related to loan workouts, such as completed modifications and loans in a modification trial period, and other alternatives to foreclosure from our servicers at the loan level on at least a monthly basis. For loans in a modification trial period, we do not receive the terms of the expected completed modification until the modification is completed. For these loans, we only receive notification that they are in a modification trial period.
Repayment plans are agreements with the borrower that give the borrower a defined period of time to reinstate the mortgage by paying regular payments plus an additional agreed upon amount in repayment of the past due amount. These agreements are considered TDRs if they result in a delay in payment that is considered to be more than insignificant.
Forbearance agreements are agreements between the servicer and the borrower where reduced payments or no payments are required during a defined period. These agreements are considered TDRs if they result in a delay in payment that is considered to be more than insignificant.
For HAMP loan modifications, our servicers typically obtain information on income, assets, and other borrower obligations to consider eligibility for modification and determine modified loan terms. Under HAMP, the goal of a single-family loan modification is to reduce the borrower’s monthly mortgage payments to a specified percentage of the borrower’s gross monthly income, which may be achieved through a combination of methods, including: (a) interest rate reduction; (b) term extension; and (c) principal forbearance. Principal forbearance is when a portion of the principal is made non-interest-bearing and non-amortizing, but this does not represent principal forgiveness. Although HAMP contemplates that some servicers will also make use of principal forgiveness to achieve reduced payments for borrowers, we have only used forbearance of principal and have not used principal forgiveness in modifying our loans.
We implemented a non-HAMP standard loan modification initiative, which replaced our previous non-HAMP modification initiative beginning January 1, 2012. Our HAMP and non-HAMP modification initiatives are available for borrowers experiencing what is generally expected to be a longer-term financial hardship. In July 2013, we implemented a streamlined (non-HAMP) modification initiative, which provides an additional modification opportunity to certain borrowers, and is scheduled to end in December 2015. The modification that borrowers receive under this initiative will have the same mortgage terms as our non-HAMP standard modification. Borrowers are not required to apply for assistance or provide income or hardship documentation for this type of modification.
Both HAMP and our non-HAMP standard modification require a three month trial period during which the borrower will make monthly payments based on the estimated amount of the modification payments. After the final trial-period payment is received by our servicer, the borrower and servicer enter into the modification. We consider restructurings under these initiatives as TDRs at the inception of the trial period if the expected modification will result in a change in our expectation to collect all amounts due at the original contract rate. Since we do not receive the terms of the modification until completion of the trial period, we estimate the impairment for loans in a modification trial period that are considered TDRs using the average impairment recorded for completed modifications and the estimated likelihood of completion of the trial period. If the borrower fails to successfully complete the trial period, the impairment for the loan is then based on the original terms of the loan. If the borrower successfully completes the trial period, the impairment for the loan is then based on the modified terms of the loan. These subsequent adjustments to impairment are based on the success or failure of the borrower to complete the trial period and are recorded through the provision for credit losses.
During 2014, approximately 51% of completed single-family loan modifications that were classified as TDRs involved interest rate reductions and, in certain cases, term extensions and approximately 25% involved principal forbearance in addition to interest rate reductions and, in certain cases, term extensions. During 2014, the average term extension was 184 months and the average interest rate reduction was 1.3% on completed single-family loan modifications classified as TDRs.
Multifamily TDRs
The assessment as to whether a multifamily loan restructuring is considered a TDR contemplates the unique facts and circumstances of each loan. This assessment considers qualitative factors such as whether the borrower’s modified interest rate is consistent with that of a borrower having a similar credit profile at the time of modification. In certain cases, for maturing loans we may provide short-term loan extensions of up to one year with no changes to the effective borrowing rate. In other cases, we may make more significant modifications of terms for borrowers experiencing financial difficulty, such as reducing the interest rate or extending the maturity for longer than one year. In cases where we do modify the contractual terms of the loan, the changes in terms may be similar to those of single-family loans, such as an extension of the term, reduction of contractual rate, principal forbearance, or some combination of these features.
TDR Activity and Performance
The table below presents the volume of single-family and multifamily loans that were newly classified as TDRs during the years ended December 31, 2014 and 2013, based on the original category of the loan before the loan was classified as a TDR. Loans classified as a TDR in one period may be subject to further action (such as a modification or remodification) in a subsequent period. In such cases, the subsequent action would not be reflected in the table below since the loan would already have been classified as a TDR.
Table 5.4 — TDR Activity, by Segment
	Year Ended December 31,
	2014							2013
	Number of Loans			Post-TDR				Number of Loans			Post-TDR
				Recorded							Recorded
				Investment							Investment
	(dollars in millions)
Single-family:(1)
20 and 30-year or more, amortizing fixed-rate	68,186			$	10,172			101,538			$	16,014
15-year amortizing fixed-rate	7,189			528				11,671			825
Adjustable-rate	1,849			285				3,604			574
Alt-A, interest-only, and option ARM	9,112			1,865				17,770			3,941
Total Single-family	86,336			12,850				134,583			21,354
Multifamily	2			15				8			98
Total	86,338			$	12,865			134,591			$	21,452
-1	The pre-TDR recorded investment for single-family loans initially classified as TDR during the years ended December 31, 2014 and 2013 was $12.8 billion and $21.2 billion, respectively.
The measurement of impairment for single-family TDRs is based on the excess of our recorded investment in the loan over the present value of the loan’s expected future cash flows. For multifamily loans, we use an estimate of the fair value of the loan’s collateral rather than the present value of expected future cash flows to determine the amount of impairment. Our process for determining the appropriate allowance for loan losses for both single-family and multifamily loans considers the impact that our loss mitigation activities, such as loan restructurings, have on probabilities of default. For single-family loans evaluated individually and collectively for impairment that have been modified, the probability of default is affected by the incidence of redefault that we have experienced on similar loans that have completed a modification. For multifamily loans, the incidence of redefault on loans that have been modified does not directly affect the allowance for loan losses as our multifamily loans are generally evaluated individually for impairment based on the fair value of the underlying collateral.
The table below presents the volume of our TDR modifications that experienced payment defaults (i.e., loans that became two months delinquent or completed a loss event) during the applicable periods and had completed a modification during the year preceding the payment default. The table presents loans based on their original product category before modification and excludes loans subject to other loss mitigation activity. Substantially all of our completed single-family loan modifications classified as a TDR during 2014 resulted in a modified loan with a fixed interest rate. However, many of these fixed-rate loans include provisions for the reduced interest rates to remain fixed for the first five years of the modification and then increase at a rate of up to one percent per year until the interest rate has been adjusted to the market rate that was in effect at the time of the modification.
Table 5.5 — Payment Defaults of Completed TDR Modifications, by Segment(1)
	Year Ended December 31,
	2014							2013
	Number of Loans			Post-TDR				Number of Loans			Post-TDR
				Recorded							Recorded
				Investment(2)							Investment(2)
	(dollars in millions)
Single-family:
20 and 30-year or more, amortizing fixed-rate	19,101			$	3,384			14,964			$	2,766
15-year amortizing fixed-rate	645			62				471			52
Adjustable-rate	332			61				237			50
Alt-A, interest-only, and option ARM	2,357			564				2,256			587
Total single-family	22,435			$	4,071			17,928			$	3,455
Multifamily	—			$	—			—			$	—
-1	Represents TDR loans that experienced a payment default during the period and had completed a modification during the year preceding the payment default.
-2	Represents the recorded investment at the end of the period in which the loan was modified and does not represent the recorded investment as of December 31.
In addition to modifications, loans may be initially classified as TDRs as a result of other loss mitigation activities (i.e., repayment plans, forbearance agreements, or trial period modifications). During the years ended December 31, 2014 and 2013, 9,538 and 8,473, respectively, of such loans (with a post-TDR recorded investment of $1.4 billion for both periods) experienced a payment default within a year after the loss mitigation activity occurred.
Loans may also be initially classified as TDRs because the borrowers’ debts were discharged in Chapter 7 bankruptcy (and the loan was not already classified as a TDR for other reasons). During the years ended December 31, 2014 and 2013, 4,206 and 17,225, respectively, of such loans (with a post-TDR recorded investment of $0.6 billion and $2.8 billion, respectively) experienced a payment default within a year after the borrowers' bankruptcy.

Real_Estate_Owned

Real Estate Owned	12 Months Ended
	Dec. 31, 2014
Repossessed Assets [Abstract]
REAL ESTATE OWNED	NOTE 6: REAL ESTATE OWNED
	We obtain REO properties: (a) when we are the highest bidder at foreclosure sales of properties that collateralize single-family and multifamily mortgage loans owned by us; or (b) when a delinquent borrower chooses to transfer the mortgaged property to us in lieu of going through the foreclosure process (i.e., deed in lieu of foreclosure). Upon acquiring single-family properties, we evaluate their marketability, including determining an estimated market value, and then select an appropriate disposition path (e.g., listing for sale with a real estate broker, or auction). Upon acquiring multifamily properties, we may operate them using third-party property management firms for a period to stabilize value and then sell the properties through commercial real estate brokers. However, certain jurisdictions require a period of time after foreclosure during which the borrower may reclaim the property. During the period when the borrower may reclaim the property, or we are completing the eviction process, we are not able to market the property and this extends our holding period for these properties. See “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES” for a discussion of our significant accounting policies for REO.
	The table below provides a summary of the change in the carrying value of our combined single-family and multifamily REO balances. For the periods presented in the table below, the weighted average holding period for our disposed properties was less than one year.
	Table 6.1 — REO
		Year Ended December 31,
		2014			2013			2012
		(in millions)
	Beginning balance — REO	$	4,602		$	4,407		$	5,827
	Additions	4,110			6,498			7,029
	Dispositions	(6,028		)	(6,303		)	(8,449		)
	Ending balance — REO	2,684			4,602			4,407
	Beginning balance, valuation allowance	(51		)	(29		)	(147		)
	Change in valuation allowance	(75		)	(22		)	118
	Ending balance, valuation allowance	(126		)	(51		)	(29		)
	Ending balance — REO, net	$	2,558		$	4,551		$	4,378
	The REO balance, net at December 31, 2014 and 2013 associated with single-family properties was $2.6 billion and $4.5 billion, respectively, and the balance associated with multifamily properties was $0 and $10 million, respectively. The Southeast region represented approximately 36% and 34% of our single-family REO additions during 2014 and 2013, respectively, based on the number of properties, and the North Central region represented approximately 25% and 29% of our single-family REO additions during these periods. Our single-family REO inventory consisted of 25,768 properties and 47,307 properties at December 31, 2014 and 2013, respectively. In recent years, the foreclosure process has been significantly slowed in many geographic areas, particularly in states that require a judicial foreclosure process, which extends the time it takes for loans to be foreclosed upon and the underlying property to transition to REO. See “NOTE 15: CONCENTRATION OF CREDIT AND OTHER RISKS” for additional information about regional concentrations in our investments in mortgage loans.
	Our REO operations expenses include: (a) REO property expenses; (b) net gains or losses incurred on disposition of REO properties; (c) adjustments to the holding period allowance associated with REO properties to record them at the lower of their carrying amount or fair value less the estimated costs to sell; and (d) recoveries from insurance and other credit enhancements. An allowance for estimated declines in the REO fair value during the period properties are held reduces the carrying value of REO property. Excluding holding period valuation adjustments and recoveries, we recognized gains of $461 million, $761 million, and $693 million on REO dispositions during 2014, 2013, and 2012, respectively. We increased (decreased) our valuation allowance for properties in our REO inventory by $176 million, $58 million, and $(7) million in 2014, 2013, and 2012, respectively.
	Non-cash Investing and Financing Activities
	REO property acquisitions as a result of the derecognition of mortgage loans held on our consolidated balance sheets upon foreclosure of the underlying collateral or deed in lieu of foreclosure represent non-cash transfers. During the years ended December 31, 2014, 2013, and 2012, we had transfers of $3.8 billion, $6.1 billion, and $6.8 billion, respectively, from mortgage loans to REO.

Investments_in_Securities

Investments in Securities	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
INVESTMENTS IN SECURITIES	NOTE 7: INVESTMENTS IN SECURITIES
	The table below summarizes amortized cost, estimated fair values, and corresponding gross unrealized gains and gross unrealized losses for available-for-sale securities by major security type. At December 31, 2014 and 2013, all available-for-sale securities are mortgage-related securities.
	Table 7.1 — Available-For-Sale Securities
										Gross Unrealized Losses
	31-Dec-14	Amortized				Gross				Other-Than-Temporary Impairment(1)			Temporary Impairment(2)			Fair
		Cost				Unrealized										Value
						Gains
		(in millions)
	Available-for-sale securities:
	Freddie Mac	$	37,710			$	1,435			$	—		$	(46	)	$	39,099
	Fannie Mae	10,860				463				—			(10		)	11,313
	Ginnie Mae	183				16				—			—			199
	CMBS	20,988				890				(2		)	(54		)	21,822
	Subprime	20,210				989				(518		)	(92		)	20,589
	Option ARM	5,460				372				(179		)	(4		)	5,649
	Alt-A and other	4,500				578				(29		)	(6		)	5,043
	Obligations of states and political subdivisions	2,166				34				—			(2		)	2,198
	Manufactured housing	556				84				(2		)	—			638
	Total available-for-sale securities	$	102,633			$	4,861			$	(730	)	$	(214	)	$	106,550
	31-Dec-13
	Available-for-sale securities:
	Freddie Mac	$	39,001			$	1,847			$	—		$	(189	)	$	40,659
	Fannie Mae	10,140				660				—			(3		)	10,797
	Ginnie Mae	149				18				—			—			167
	CMBS	29,151				1,524				(23		)	(314		)	30,338
	Subprime	29,897				382				(2,467		)	(313		)	27,499
	Option ARM	6,617				338				(376		)	(5		)	6,574
	Alt-A and other	8,322				526				(118		)	(24		)	8,706
	Obligations of states and political subdivisions	3,533				23				(7		)	(54		)	3,495
	Manufactured housing	629				61				(4		)	(2		)	684
	Total available-for-sale securities	$	127,439			$	5,379			$	(2,995	)	$	(904	)	$	128,919
	-1	Represents the gross unrealized losses for securities for which we have previously recognized other-than-temporary impairments in earnings.
	-2	Represents the gross unrealized losses for securities for which we have not previously recognized other-than-temporary impairments in earnings.
	Available-For-Sale Securities in a Gross Unrealized Loss Position
	The table below shows the fair value of available-for-sale securities in a gross unrealized loss position, and whether they have been in that position less than 12 months, or 12 months or greater.
	Table 7.2 — Available-For-Sale Securities in a Gross Unrealized Loss Position
		Less than 12 Months								12 Months or Greater
	31-Dec-14	Fair				Gross Unrealized Losses				Fair			Gross Unrealized Losses
		Value								Value
		(in millions)
	Available-for-sale securities:
	Freddie Mac	$	2,531			$	(14	)		$	936		$	(32	)
	Fannie Mae	2,693				(9		)		5			(1		)
	Ginnie Mae	66				—				—			—
	CMBS	184				(5		)		1,149			(51		)
	Subprime	286				(3		)		6,533			(607		)
	Option ARM	77				—				1,490			(183		)
	Alt-A and other	185				(5		)		499			(30		)
	Obligations of states and political subdivisions	48				—				28			(2		)
	Manufactured housing	42				—				15			(2		)
	Total available-for-sale securities in a gross unrealized loss position	$	6,112			$	(36	)		$	10,655		$	(908	)
	31-Dec-13
	Available-for-sale securities:
	Freddie Mac	$	7,957			$	(144	)		$	649		$	(45	)
	Fannie Mae	248				(2		)		19			(1		)
	CMBS	1,147				(85		)		1,992			(252		)
	Subprime	472				(19		)		19,103			(2,761		)
	Option ARM	77				(2		)		2,608			(379		)
	Alt-A and other	262				(5		)		1,854			(137		)
	Obligations of states and political subdivisions	1,885				(56		)		24			(5		)
	Manufactured housing	—				—				65			(6		)
	Total available-for-sale securities in a gross unrealized loss position	$	12,048			$	(313	)		$	26,314		$	(3,586	)
	At December 31, 2014, total gross unrealized losses on available-for-sale securities were $0.9 billion. The gross unrealized losses relate to 385 individual lots representing 364 separate securities. We purchase multiple lots of individual securities at different times and at different costs. We determine gross unrealized gains and gross unrealized losses by specifically evaluating investment positions at the lot level; therefore, some of the lots we hold for an individual security may be in an unrealized gain position while other lots for that security may be in an unrealized loss position, depending upon the amortized cost of the specific lot.
	Impairment Recognition on Investments in Securities
We recognize impairment losses on available-for-sale securities within our consolidated statements of comprehensive income as net impairment of available-for-sale securities recognized in earnings when we conclude that a decrease in the fair value of a security is other-than-temporary. For information regarding our evaluation of our available-for-sale securities for impairment, see "NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES — Investments in Securities."
The evaluation of whether unrealized losses on available-for-sale securities are other-than-temporary requires significant management judgments and assumptions and consideration of numerous factors. We perform an evaluation on a security-by-security basis considering all available information. The relative importance of this information varies based on the facts and circumstances surrounding each security, as well as the economic environment at the time of assessment. Important factors include, but are not limited to:
•	whether we intend to sell the security or it is more likely than not that we will be required to sell the security before sufficient time elapses to recover all unrealized losses;
•	the use of a third-party model for single-family non-agency mortgage-related securities that considers the credit performance of the underlying collateral, including current LTV ratio, delinquency status, servicer performance, loan modification terms and status, and borrower credit information. The model also incorporates assumptions about the economic environment, including future home prices, unemployment, and interest rates to project underlying collateral prepayment speeds, default rates, loss severities, and delinquency rates. Our estimation approach for CMBS includes the use of a separate third-party model that utilizes underlying collateral performance, current and expected credit enhancements, and incorporates assumptions about the underlying collateral cash flows; and
•	the incorporation of security-level subordination information and the priority of cash flow payments by the models to project and estimate cash flows expected to be collected for each security.
See “Table 7.2 — Available-For-Sale Securities in a Gross Unrealized Loss Position” for the length of time our available-for-sale securities have been in an unrealized loss position. Also see “Table 7.3 — Significant Modeled Attributes for Certain Available-For-Sale Non-Agency Mortgage-Related Securities” for the modeled default rates and severities that were used to determine whether our senior interests in certain non-agency mortgage-related securities would experience a cash shortfall.
As noted in “Table 7.4 — Net Impairment of Available-For-Sale Securities Recognized in Earnings,” our net impairment on available-for-sale securities during 2014 includes certain securities that we have the intent to sell prior to the recovery of the unrealized loss. In cases where we have the intent to sell or it is more likely than not that we will be required to sell the security before recovery of its amortized cost, the security’s entire decline in fair value would be deemed to be other-than-temporary and is recorded within our consolidated statements of comprehensive income as net impairment of available-for-sale securities recognized in earnings. For the remaining available-for-sale securities in an unrealized loss position at December 31, 2014, we have asserted that we have no intent to sell and that we believe it is not more likely than not that we will be required to sell the security before recovery of its amortized cost basis.
Freddie Mac and Fannie Mae Securities
We record the purchase of mortgage-related securities issued by Fannie Mae as investments in securities in accordance with the accounting guidance for investments in debt and equity securities. In contrast, our purchase of mortgage-related securities that we issued (e.g., PCs, REMICs and Other Structured Securities, and Other Guarantee Transactions) is recorded as either investments in securities or extinguishment of debt securities of consolidated trusts depending on the nature of the mortgage-related security that we purchase. See “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES — Securitization Activities through Issuances of Freddie Mac Mortgage-Related Securities” for additional information.
We hold these investments in securities that are in an unrealized loss position at least to recovery and typically to maturity. As the principal and interest on these securities are guaranteed and we do not intend to sell these securities and it is not more likely than not that we will be required to sell such securities before a recovery of the securities' amortized cost basis, we consider these unrealized losses to be temporary.
Non-Agency Mortgage-Related Securities Backed by Subprime, Option ARM, Alt-A and Other Loans
We believe the unrealized losses on the non-agency mortgage-related securities we hold are mainly attributable to poor underlying collateral performance, limited liquidity, and risk premiums. Our review of the securities backed by subprime, option ARM, and Alt-A and other loans includes the third-party loan level default modeling and analyses of the individual securities based on underlying collateral performance, including the collectability of amounts from bond insurers. In evaluating collectability from bond insurers, we consider factors that affect both the bond insurers’ financial performance and ability to pay their obligations. We consider loan level information including estimated current LTV ratios, credit scores, and other loan level characteristics. For additional information regarding bond insurers, see “NOTE 15: CONCENTRATION OF CREDIT AND OTHER RISKS — Bond Insurers.”
The table below presents the modeled attributes, including default rates, prepayment rates, and severities, without regard to subordination, that are used to determine whether our interests in certain available-for-sale non-agency mortgage-related securities will experience a cash shortfall.
Table 7.3 — Significant Modeled Attributes for Certain Available-For-Sale Non-Agency Mortgage-Related Securities
	31-Dec-14
									Alt-A
	Subprime				Option ARM				Fixed Rate			Variable Rate			Hybrid Rate
	(dollars in millions)
Issuance Date
2004 and prior:
UPB	$	534			$	38			$	335		$	258		$	189
Weighted average collateral defaults(1)	33		%		19		%		13		%	30		%	15		%
Weighted average collateral severities(2)	61		%		46		%		45		%	42		%	38		%
Weighted average voluntary prepayment rates(3)	7		%		11		%		13		%	8		%	10		%
Average credit enhancements(4)	31		%		—		%		14		%	11		%	13		%
2005:00:00
UPB	$	2,667			$	1,743			$	479		$	374		$	1,107
Weighted average collateral defaults(1)	43		%		26		%		18		%	37		%	21		%
Weighted average collateral severities(2)	63		%		47		%		45		%	52		%	41		%
Weighted average voluntary prepayment rates(3)	4		%		10		%		12		%	8		%	11		%
Average credit enhancements(4)	48		%		1		%		(1		)%	17		%	2		%
2006:00:00
UPB	$	11,204			$	4,063			$	226		$	418		$	422
Weighted average collateral defaults(1)	49		%		35		%		25		%	38		%	30		%
Weighted average collateral severities(2)	63		%		47		%		44		%	48		%	41		%
Weighted average voluntary prepayment rates(3)	3		%		8		%		10		%	8		%	10		%
Average credit enhancements(4)	7		%		(3		)%		(2		)%	1		%	(4		)%
2007:00:00
UPB	$	13,277			$	2,443			$	118		$	458		$	165
Weighted average collateral defaults(1)	49		%		34		%		40		%	38		%	29		%
Weighted average collateral severities(2)	63		%		48		%		51		%	49		%	43		%
Weighted average voluntary prepayment rates(3)	3		%		8		%		7		%	8		%	10		%
Average credit enhancements(4)	1		%		3		%		(1		)%	(19		)%	—		%
Total:
UPB	$	27,682			$	8,287			$	1,158		$	1,508		$	1,883
Weighted average collateral defaults(1)	48		%		33		%		20		%	36		%	23		%
Weighted average collateral severities(2)	63		%		47		%		46		%	48		%	41		%
Weighted average voluntary prepayment rates(3)	3		%		8		%		12		%	8		%	11		%
Average credit enhancements(4)	9		%		—		%		3		%	1		%	2		%
-1	The expected cumulative default rate is expressed as a percentage of the current collateral UPB.
-2	The expected average loss given default is calculated as the ratio of cumulative loss over cumulative default for each security.
-3	The security’s voluntary prepayment rate represents the average of the monthly voluntary prepayment rate weighted by the security’s outstanding UPB.
-4	Positive values reflect the amount of subordination and other financial support (excluding credit enhancement provided by bond insurance) that will incur losses in the securitization structure before any losses are allocated to securities that we own. Percentage generally calculated based on: (a) the total UPB of securities subordinate to the securities we own; divided by (b) the total UPB of all of the securities issued by the trust (excluding notional balances). Negative values are shown when unallocated collateral losses will be allocated to the securities that we own in excess of current remaining credit enhancement, if any. The unallocated collateral losses have been considered in our assessment of other-than-temporary impairment.
In evaluating the non-agency mortgage-related securities backed by subprime, option ARM, and Alt-A and other loans for other-than-temporary impairment, we noted that the percentage of securities that were AAA-rated and the percentage that were investment grade declined significantly since acquisition. While these ratings have declined, the ratings themselves are not determinative that a loss is more or less likely. While we may consider credit ratings in our analysis, we believe that our detailed security-by-security analyses provide a more comprehensive view of the ultimate collectability of contractual amounts due to us.
Our analysis is subject to change as new information regarding delinquencies, severities, loss timing, prepayments, and other factors becomes available. While it is possible that, under certain conditions, collateral losses on our remaining available-for-sale securities for which we have not recorded an impairment charge could exceed our credit enhancement levels and a principal or interest loss could occur, we do not believe that those conditions were likely as of December 31, 2014.
Commercial Mortgage-Backed Securities
CMBS are exposed to stresses in the commercial real estate market. We use an external model to identify securities that may have an increased risk of failing to make their contractual payments. We then perform an analysis of the underlying collateral on a security-by-security basis to determine whether we expect to receive all of the contractual payments due to us. While it is possible that, under certain conditions, collateral losses on our CMBS for which we have not recorded an impairment charge could exceed our credit enhancement levels and a principal or interest loss could occur, we do not believe that those conditions were likely as of December 31, 2014.
Obligations of States and Political Subdivisions
These investments consist of housing revenue bonds. We believe the unrealized losses on obligations of states and political subdivisions are primarily a result of movements in interest rates and liquidity and risk premiums. We believe that any credit risk related to these securities is minimal because of the issuer guarantees provided on these securities.
Bond Insurance
We rely on bond insurance to provide credit protection on some of our non-agency mortgage-related securities. Circumstances in which: (a) it is expected that a principal and interest shortfall will occur; and (b) there is substantial uncertainty surrounding a bond insurer’s ability to pay all future claims can give rise to recognition of other-than-temporary impairment recognized in earnings. See “NOTE 15: CONCENTRATION OF CREDIT AND OTHER RISKS — Bond Insurers” for additional information.
Other-Than-Temporary Impairments on Available-for-Sale Securities
The table below summarizes our net impairment of available-for-sale securities recognized in earnings by security type.
Table 7.4 — Net Impairment of Available-For-Sale Securities Recognized in Earnings
	Net Impairment of Available-For-Sale Securities Recognized in Earnings For the Year Ended December 31,
	2014				2013				2012
	(in millions)
Available-for-sale securities:(1)
CMBS	$	—			$	(14	)		$	(138	)
Subprime	(794		)		(1,258		)		(1,274		)
Option ARM	(101		)		(58		)		(556		)
Alt-A and other	(42		)		(179		)		(196		)
Manufactured housing	(1		)		(1		)		(4		)
Total net impairment of available-for-sale securities recognized in earnings	$	(938	)		$	(1,510	)		$	(2,168	)
-1	Includes $817 million, $568 million, and $0 million of other-than-temporary impairments recognized in earnings for the years ended December 31, 2014, 2013, and 2012, respectively, as we had the intent to sell the related securities before recovery of their amortized cost basis.
The table below presents the changes in the unrealized credit-related other-than-temporary impairment component of the amortized cost related to available-for-sale securities: (a) that we have written down for other-than-temporary impairment; and (b) for which the credit component of the loss has been recognized in earnings. The credit-related other-than-temporary impairment component of the amortized cost represents the difference between: (a) the present value of expected future cash flows at the time of impairment, including the estimated proceeds from bond insurance; and (b) the amortized cost basis of the security prior to considering credit losses. The beginning balances represent the other-than-temporary impairment credit loss components related to available-for-sale securities for which other-than-temporary impairment occurred prior to January 1, 2014 and January 1, 2013, respectively, but will not be realized until the securities are sold, written off, or mature. Net impairment of available-for-sale securities recognized in earnings is presented as additions in two components based upon whether the current period is: (a) the first time the debt security was credit-impaired; or (b) not the first time the debt security was credit-impaired. The credit loss component is reduced if we sell, intend to sell or believe we will be required to sell previously credit-impaired available-for-sale securities. Additionally, the credit loss component is reduced by the amortization resulting from significant increases in cash flows expected to be collected that are recognized over the remaining life of the security.
Table 7.5 — Other-Than-Temporary Impairments Related to Credit Losses on Available-For-Sale Securities
		Year Ended December 31,
		2014				2013
	(in millions)
Credit-related other-than-temporary impairments on available-for-sale securities recognized in earnings:
Beginning balance — remaining credit losses on available-for-sale securities where other-than-temporary impairments were recognized in earnings		$	14,463			$	16,745
Additions:
Amounts related to credit losses for which an other-than-temporary impairment was not previously recognized		—				46
Amounts related to credit losses for which an other-than-temporary impairment was previously recognized		121				896
Reductions:
Amounts related to securities which were sold, written off, or matured		(1,188		)		(1,193		)
Amounts for which we intend to sell the security or it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis		(6,113		)		(1,536		)
Amounts related to amortization resulting from significant increases in cash flows expected to be collected and/or due to the passage of time that are recognized over the remaining life of the security		(485		)		(495		)
Ending balance — remaining credit losses on available-for-sale securities where other-than-temporary impairments were recognized in earnings(1)		$	6,798			$	14,463
-1	Excludes other-than-temporary impairments on securities that we intend to sell or it is more likely than not that we will be required to sell before recovery of the unrealized losses.
Realized Gains and Losses on Sales of Available-For-Sale Securities
The table below illustrates the gross realized gains and gross realized losses from the sale of available-for-sale securities.
Table 7.6 — Gross Realized Gains and Gross Realized Losses on Sales of Available-For-Sale Securities
	Year Ended December 31,
	2014				2013				2012
	(in millions)
Gross realized gains	$	1,897			$	1,950			$	152
Gross realized losses	(185		)		(51		)		—
Net realized gains (losses)	$	1,712			$	1,899			$	152
Maturities of Available-For-Sale Securities
The table below summarizes the remaining contractual maturities of available-for-sale securities.
Table 7.7 — Contractual Maturities of Available-For-Sale Securities
	As of December 31, 2014
															After One Year Through Five Years					After Five Years Through Ten Years
	Total Amortized Cost				Total Fair Value				One Year or Less																After Ten Years
									Amortized Cost			Fair Value			Amortized Cost			Fair Value		Amortized Cost			Fair Value		Amortized Cost			Fair Value
	(dollars in millions)
Available-for-sale securities:
Freddie Mac	$	37,710			$	39,099			$	—		$	—		$	300		$	309	$	526		$	559	$	36,884		$	38,231
Fannie Mae	10,860				11,313				1			1			61			64		108			120		10,690			11,128
Ginnie Mae	183				199				—			—			4			4		22			26		157			169
CMBS	20,988				21,822				—			—			316			330		8			8		20,664			21,484
Subprime	20,210				20,589				—			—			—			—		—			—		20,210			20,589
Option ARM	5,460				5,649				—			—			—			—		—			—		5,460			5,649
Alt-A and other	4,500				5,043				1			1			31			31		2			2		4,466			5,009
Obligations of states and political subdivisions	2,166				2,198				—			—			40			43		48			49		2,078			2,106
Manufactured housing	556				638				—			—			—			—		9			11		547			627
Total available-for-sale securities	$	102,633			$	106,550			$	2		$	2		$	752		$	781	$	723		$	775	$	101,156		$	104,992
Weighted Average Yield(1)	2.65		%						7.63		%				5.04		%			5.1		%			2.61		%
-1	The weighted average yield is calculated based on a yield for each individual lot held at December 31, 2014 excluding any fully taxable-equivalent adjustments related to tax exempt sources of interest income. The numerator for the individual lot yield consists of the sum of: (a) the year-end interest coupon rate multiplied by the year-end UPB; and (b) the amortization income or expense calculated for December 2014 (excluding the accretion of non-credit-related other-than-temporary impairments and any adjustments recorded for changes in the effective rate). The denominator for the individual lot yield consists of the year-end amortized cost of the lot excluding effects of other-than-temporary impairments on the UPB of impaired lots.
Trading Securities
The table below summarizes the estimated fair values by major security type for trading securities. Our trading securities mainly consist of Treasury securities, agency fixed-rate and variable-rate pass-through mortgage-related securities, and agency REMICs, including inverse floating rate, interest-only and principal-only securities.
Table 7.8 — Trading Securities
	31-Dec-14				31-Dec-13
	(in millions)
Mortgage-related securities:
Freddie Mac	$	17,469			$	9,349
Fannie Mae	6,099				7,180
Ginnie Mae	16				98
Other	171				141
Total mortgage-related securities	23,755				16,768
U.S. Treasury securities	6,682				6,636
Total fair value of trading securities	$	30,437			$	23,404
With the exception of principal-only securities, our agency securities, classified as trading, were valued at a net premium (i.e., net fair value was higher than UPB) as of December 31, 2014.
For the years ended December 31, 2014, 2013, and 2012, we recorded net unrealized gains (losses) on trading securities held at those dates of $(88) million, $(1.6) billion, and $(1.7) billion, respectively.
Non-Cash Investing and Financing Activities
From time to time, beginning in 2014, we contribute PCs, single-class REMICs and Other Structured Securities held in our mortgage-related investments portfolio as collateral for a multiclass REMIC and Other Structured Securities trust in exchange for beneficial interests in the multiclass REMIC and Other Structured Securities trust. We do not consolidate the multiclass REMIC and Other Structured Securities trust unless we hold substantially all of the beneficial interests issued by the trust. As a result, if we do not hold substantially all of the beneficial interests issued by the multiclass REMIC and Other Structured Securities trust, we account for this type of transaction as the acquisition of investment securities and issuance of debt securities of consolidated trusts. During 2014, we received investment securities as consideration for the issuance of debt securities of consolidated trusts of $1.8 billion as a result of these transactions.

Debt_Securities_and_Subordinat

Debt Securities and Subordinated Borrowings	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
DEBT SECURITIES AND SUBORDINATED BORROWINGS	NOTE 8: DEBT SECURITIES AND SUBORDINATED BORROWINGS
	Debt securities that we issue are classified on our consolidated balance sheets as either debt securities of consolidated trusts held by third parties or other debt. We issue other debt to fund our operations.
	Under the Purchase Agreement, without the prior written consent of Treasury, we may not incur indebtedness that would result in the par value of our aggregate indebtedness exceeding 120% of the amount of mortgage assets we are allowed to own on December 31 of the immediately preceding calendar year. Because of this debt limit, we may be restricted in the amount of debt we are allowed to issue to fund our operations. Under the Purchase Agreement, the amount of our “indebtedness” is determined without giving effect to the January 1, 2010 change in the accounting guidance related to transfers of financial assets and consolidation of VIEs. Therefore, “indebtedness” does not include debt securities of consolidated trusts held by third parties. We also cannot become liable for any subordinated indebtedness without the prior consent of Treasury. See “NOTE 2: CONSERVATORSHIP AND RELATED MATTERS” for information regarding restrictions on the amount of mortgage-related securities that we may own.
	Our debt cap under the Purchase Agreement was $663.0 billion in 2014 and declined to $563.6 billion on January 1, 2015. As of December 31, 2014, our aggregate indebtedness was $454.0 billion. Our aggregate indebtedness is calculated as the par value of other short- and long-term debt.
	In the tables below, the categories of short-term debt (due within one year) and long-term debt (due after one year) are based on the original contractual maturity of the debt instruments classified as other debt.
	Other Short-Term Debt
	As indicated in "Table 8.1 — Other Short-Term Debt", a majority of other short-term debt consisted of Reference Bills® securities and discount notes, paying only principal at maturity. Reference Bills® securities, discount notes, and medium-term notes are unsecured general corporate obligations. Certain medium-term notes that have original maturities of one year or less are classified as other short-term debt for purposes of this presentation.
	The table below summarizes the balances and effective interest rates for other short-term debt.
	Table 8.1 — Other Short-Term Debt
		31-Dec-14											31-Dec-13
		Par Value				Carrying Amount				Weighted			Par Value				Carrying Amount				Weighted
										Average											Average
										Effective Rate											Effective Rate
		(dollars in millions)
	Other short-term debt:
	Reference Bills® securities and discount notes	$	134,670			$	134,619			0.12	%		$	137,767			$	137,712			0.13	%
	Medium-term notes	—				—				—			4,000				4,000				0.16
	Total other short-term debt	$	134,670			$	134,619			0.12			$	141,767			$	141,712			0.13
	Federal Funds Purchased and Securities Sold Under Agreements to Repurchase
	We had no balances in federal funds purchased and securities sold under agreements to repurchase at either December 31, 2014 or 2013.
	Other Long-Term Debt
	The table below summarizes our other long-term debt.
	Table 8.2 — Other Long-Term Debt
		31-Dec-14													31-Dec-13
		Contractual Maturity		Par Value				Carrying Amount(1)				Weighted Average			Par Value				Carrying Amount(1)				Weighted Average
												Effective Rate											Effective Rate
		(dollars in millions)
	Other long-term debt:
	Other senior debt:
	Fixed-rate:
	Medium-term notes — callable	2015 - 2037		$	98,860			$	98,856			1.35	%		$	101,190			$	101,236			1.51	%
	Medium-term notes — non-callable	2015 - 2028		20,059				20,383				0.86			37,878				38,107				0.99
	U.S. dollar Reference Notes securities — non-callable	2015 - 2032		151,701				151,751				2.8			190,371				190,406				2.71
	€Reference Notes securities — non-callable			—				—							528				529				4.38
	Variable-rate:
	Medium-term notes — callable	2015 - 2029		7,210				7,210				2			6,001				6,001				1.66
	Medium-term notes — non-callable	2015 - 2026		23,971				23,971				0.19			18,533				18,533				0.22
	STACR	2023 - 2024		5,896				5,820				3.16			1,107				1,155				4.29
	Zero-coupon:
	Medium-term notes — callable	2037		1,000				264				6.17			1,200				311				5.82
	Medium-term notes — non-callable	2015 - 2039		10,109				6,739				2.53			12,217				8,334				3.08
	Hedging-related basis adjustments			N/A				34							N/A				41
	Total other senior debt			318,806				315,028							369,025				364,653
	Other subordinated debt:
	Fixed-rate	2016 - 2018		221				219				6.6			221				218				6.6
	Zero-coupon	2019		332				203				10.51			332				184				10.51
	Total other subordinated debt			553				422							553				402
	Total other long-term debt			$	319,359			$	315,450			2.02	%		$	369,578			$	365,055			2.08	%
	-1	Includes $5.8 billion and $2.6 billion, respectively, of other long-term debt that represents the fair value of debt securities with the fair value option elected at December 31, 2014 and 2013.
	A portion of our other long-term debt is callable. Callable debt gives us the option to redeem the debt security at par on one or more specified call dates or at any time on or after a specified call date.
	Debt Securities of Consolidated Trusts Held by Third Parties
	Debt securities of consolidated trusts held by third parties represents our liability to third parties that hold beneficial interests in our consolidated securitization trusts (i.e., single-family PC trusts and certain single-family and multifamily Other Guarantee Transactions). Debt securities of consolidated trusts held by third parties are prepayable as the loans that collateralize the debt may prepay without penalty at any time.
	The table below summarizes the debt securities of consolidated trusts held by third parties based on underlying mortgage product type.
	Table 8.3 — Debt Securities of Consolidated Trusts Held by Third Parties
		31-Dec-14													31-Dec-13
		Contractual		UPB				Carrying Amount				Weighted			Contractual		UPB				Carrying Amount				Weighted
		Maturity										Average			Maturity										Average
												Coupon(1)													Coupon(1)
		(dollars in millions)													(dollars in millions)
	Single-family:
	30-year or more, fixed-rate	2015 - 2053		$	1,018,357			$	1,047,302			4.04	%		2014 - 2052		$	969,270			$	993,683			4.14	%
	20-year fixed-rate	2015 - 2035		71,545				73,764				3.74			2014 - 2034		75,910				78,252				3.81
	15-year fixed-rate	2015 - 2030		266,117				272,538				3.13			2014 - 2029		270,513				277,018				3.23
	Adjustable-rate	2015 - 2047		65,082				66,518				2.62			2014 - 2047		60,683				61,830				2.64
Interest-only	2026 - 2041		17,474				17,524				3.29			2026 - 2041		21,352				21,390				3.7
FHA/VA	2015 - 2044		1,226				1,250				5.42			2014 - 2041		1,284				1,303				5.67
Total single-family			1,439,801				1,478,896									1,399,012				1,433,476
Multifamily(2)	2017 - 2019		524				577				4.93			2018 - 2019		444				508				4.96
Total debt securities of consolidated trusts held by third parties			$	1,440,325			$	1,479,473								$	1,399,456			$	1,433,984
-1	The effective rate for debt securities of consolidated trusts held by third parties was 3.19% and 3.39% as of December 31, 2014 and 2013, respectively.
-2	Carrying amount includes interest-only securities recorded at fair value.
The table below summarizes the contractual maturities of other long-term debt securities and debt securities of consolidated trusts held by third parties at December 31, 2014.
Table 8.4 — Contractual Maturity of Other Long-Term Debt and Debt Securities of Consolidated Trusts Held by Third Parties
Annual Maturities	Par  Value
	(in millions)
Other long-term debt:
2015	$	58,841
2016	72,503
2017	77,482
2018	30,850
2019	30,671
Thereafter	49,012
Debt securities of consolidated trusts held by third parties(1)	1,440,325
Total	1,759,684
Net discounts, premiums, hedge-related and other basis adjustments(2)	35,239
Total debt securities of consolidated trusts held by third parties and other long-term debt	$	1,794,923
-1	Contractual maturities of debt securities of consolidated trusts held by third parties may not represent expected maturity as they are prepayable at any time without penalty.
-2	Other basis adjustments primarily represent changes in fair value attributable to instrument-specific credit risk.
Subordinated Debt Interest and Principal Payments
The terms of certain of our subordinated debt securities provide for us to defer payments of interest in the event we fail to maintain specified capital levels. However, in a September 23, 2008 statement concerning the conservatorship, the Director of FHFA stated that we would continue to make interest and principal payments on our subordinated debt, even if we fail to maintain required capital levels.

Derivatives

Derivatives	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES	NOTE 9: DERIVATIVES
	Use of Derivatives
	We use derivatives primarily to manage the interest rate risk associated with our investments in financial assets and related liabilities. We analyze the interest-rate sensitivity of financial assets and liabilities on a daily basis across a variety of interest-rate scenarios based on market prices, models and economics. We use derivatives to hedge interest-rate sensitivity mismatches between our assets and liabilities. For example, if rates increase and the duration of our assets extends more than the duration of our liabilities, we would rebalance our interest-rate exposure by entering into pay-fixed interest-rate swaps or selling Treasury-derivatives. If rates decrease and the duration of our assets shortens more than the duration of our liabilities, we would rebalance our interest-rate exposure by entering into receive-fixed interest-rate swaps or purchasing Treasury-derivatives. When we use derivatives to mitigate our exposures, we consider a number of factors, including cost, exposure to counterparty risk, and our overall risk management strategy.
	We classify derivatives into three categories: (a) exchange-traded derivatives; (b) cleared derivatives; and (c) OTC derivatives. Exchange-traded derivatives include standardized interest-rate futures contracts and options on futures contracts. Cleared derivatives refer to those interest-rate swaps that the U.S. Commodity Futures Trading Commission has determined are subject to the central clearing requirement of the Dodd-Frank Act. OTC derivatives refer to those derivatives that are neither exchange-traded derivatives nor cleared derivatives.
	Types of Derivatives
	We principally use the following types of derivatives:
	•	LIBOR-based interest-rate swaps;
	•	LIBOR- and Treasury-based options (including swaptions); and
	•	LIBOR- and Treasury-based exchange-traded futures.
	In addition to swaps, futures, and purchased options, our derivative positions include written options and swaptions, commitments, swap guarantees, and credit derivatives.
	Written Options and Swaptions
	Written call and put swaptions are sold to counterparties allowing them the option to enter into receive- and pay-fixed interest rate swaps, respectively. Written call and put options on mortgage-related securities give the counterparty the right to execute a contract under specified terms, which generally occurs when we are in a liability position. We may, from time to time, write other derivative contracts such as interest-rate futures.
	Commitments
	We routinely enter into commitments that include our: (a) commitments to purchase and sell investments in securities; (b) commitments to purchase mortgage loans; and (c) commitments to purchase and extinguish or issue debt securities of our consolidated trusts. Most of these commitments are considered derivatives and therefore are subject to the accounting guidance for derivatives and hedging.
	Swap Guarantee Derivatives
	In connection with some of the guarantee arrangements pertaining to multifamily housing revenue bonds and multifamily pass-through certificates, we may also guarantee the sponsor’s or the borrower’s obligations as a counterparty on any related interest-rate swaps used to mitigate interest-rate risk, which are accounted for as swap guarantee derivatives.
	Credit Derivatives
	We entered into credit-risk sharing agreements for certain credit enhanced multifamily housing revenue bonds held by third parties in exchange for a monthly fee. In addition, we have purchased mortgage loans containing debt cancellation contracts, which provide for mortgage debt or payment cancellation for borrowers who experience unanticipated losses of income dependent on a covered event. The rights and obligations under these agreements have been assigned to the servicers. However, in the event the servicer does not perform as required by contract we would be obligated under our guarantee to make the required contractual payments.
	For a discussion of our significant accounting policies related to derivatives, see “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES — Derivatives.”
	Derivative Assets and Liabilities at Fair Value
	The table below presents the notional value and fair value of derivatives reported on our consolidated balance sheets.
	Table 9.1 — Derivative Assets and Liabilities at Fair Value
		31-Dec-14									31-Dec-13
		Notional or			Derivatives at Fair Value						Notional or		Derivatives at Fair Value
		Contractual									Contractual
		Amount			Assets			Liabilities			Amount		Assets			Liabilities
		(in millions)
	Total derivative portfolio
	Derivatives not designated as hedging instruments under the accounting guidance for derivatives and hedging
	Interest-rate swaps:
	Receive-fixed	$	205,219		$	5,243		$	(487	)	$	281,727	$	4,475		$	(2,438	)
	Pay-fixed	213,325			408			(12,829		)	242,597		5,540			(10,879		)
	Basis (floating to floating)	300			2			—			300		4			—
	Total interest-rate swaps	418,844			5,653			(13,316		)	524,624		10,019			(13,317		)
	Option-based:
	Call swaptions
	Purchased	56,390			3,315			—			59,290		2,373			—
	Written	10,660			—			(90		)	5,945		—			(201		)
	Put Swaptions
	Purchased	22,125			179			—			33,410		698			—
	Written	3,560			—			(9		)	—		—			—
	Other option-based derivatives(1)	19,733			730			(28		)	23,365		1,041			(3		)
	Total option-based	112,468			4,224			(127		)	122,010		4,112			(204		)
	Futures	40,263			—			—			50,270		—			—
	Foreign-currency swaps	—			—			—			528		39			—
	Commitments	27,054			40			(79		)	18,731		61			(69		)
	Credit derivatives	5,207			27			(11		)	5,386		—			(6		)
	Swap guarantee derivatives	3,204			—			(27		)	3,477		—			(31		)
	Total derivatives not designated as hedging instruments	607,040			9,944			(13,560		)	725,026		14,231			(13,627		)
	Derivative interest receivable (payable)				817			(1,500		)			1,243			(1,835		)
	Netting adjustments(2)				(9,939		)	13,097					(14,411		)	15,282
	Total derivative portfolio, net	$	607,040		$	822		$	(1,963	)	$	725,026	$	1,063		$	(180	)
	-1	Primarily includes purchased interest-rate caps and floors and options on Treasury futures.
	-2	Represents counterparty netting and cash collateral netting. Net cash collateral posted was $3.2 billion and $871 million at December 31, 2014 and 2013, respectively.
	The carrying value of our derivatives on our consolidated balance sheets is equal to their fair value, including net derivative interest receivable or payable and net trade/settle receivable or payable, and is net of cash collateral held or posted, where allowable. Derivatives in a net asset position are reported as derivative assets, net. Similarly, derivatives in a net liability position are reported as derivative liabilities, net.
	See “NOTE 10: COLLATERAL AND OFFSETTING OF ASSETS AND LIABILITIES” for information related to our derivative counterparties and collateral held and posted.
	Gains and Losses on Derivatives
	The table below presents the gains and losses on derivatives, including the accrual of periodic cash settlements, reported in our consolidated statements of comprehensive income as derivate gains (losses).
	Table 9.2 — Gains and Losses on Derivatives
	Derivatives not designated as hedging	Derivative Gains (Losses)
	instruments under the accounting	Year Ended December 31,
	guidance for derivatives and hedging	2014			2013			2012
		(in millions)
	Interest-rate swaps:
Receive-fixed
Foreign-currency denominated	$	(1	)	$	(21	)	$	(33	)
U.S. dollar denominated	4,074			(10,400		)	2,686
Total receive-fixed swaps	4,073			(10,421		)	2,653
Pay-fixed	(11,366		)	19,021			(2,865		)
Basis (floating to floating)	(1		)	(2		)	8
Total interest-rate swaps	(7,294		)	8,598			(204		)
Option based:
Call swaptions
Purchased	2,355			(2,547		)	1,365
Written	(168		)	546			(38		)
Put swaptions
Purchased	(1,006		)	(8		)	(273		)
Written	8			—			6
Other option-based derivatives(1)	248			(413		)	190
Total option-based	1,437			(2,422		)	1,250
Futures	(54		)	21			12
Foreign-currency swaps	(7		)	30			(8		)
Commitments	239			(131		)	298
Credit derivatives	8			(3		)	—
Swap guarantee derivatives	8			9			7
Other	(3		)	(3		)	(1		)
Subtotal	(5,666		)	6,099			1,354
Accrual of periodic settlements:
Receive-fixed interest-rate swaps	3,033			3,764			3,511
Pay-fixed interest-rate swaps	(5,660		)	(7,233		)	(7,318		)
Foreign-currency swaps	—			—			4
Other	2			2			1
Total accrual of periodic settlements	(2,625		)	(3,467		)	(3,802		)
Total	$	(8,291	)	$	2,632		$	(2,448	)
-1	Primarily includes purchased interest-rate caps and floors and options on Treasury futures.
Hedge Designation of Derivatives
At December 31, 2014 and 2013, we did not have any derivatives in hedge accounting relationships; however, there are deferred net losses recorded in AOCI related to closed cash flow hedges. Net deferred gains and losses on closed cash flow hedges (i.e., where the derivative is either terminated or redesignated) are included in AOCI until the related forecasted transaction affects earnings or is determined to be probable of not occurring. Amounts reclassified from AOCI linked to interest payments on other debt are recorded in other debt interest expense and amounts not linked to interest payments on other debt are recorded in expense related to derivatives. In the years ended December 31, 2014 and 2013, we reclassified from AOCI into earnings, losses of $303 million and $460 million, respectively, related to closed cash flow hedges. See “NOTE 11: STOCKHOLDERS’ EQUITY — Accumulated Other Comprehensive Income — Future Reclassifications from AOCI to Net Income Related to Closed Cash Flow Hedges” for information about future reclassifications of deferred net losses related to closed cash flow hedges to net income.

Collateral_and_Offsetting_of_A

Collateral and Offsetting of Assets and Liabilities	12 Months Ended
	Dec. 31, 2014
Offsetting [Abstract]
COLLATERAL AND OFFSETTING OF ASSETS AND LIABILITIES	NOTE 10: COLLATERAL AND OFFSETTING OF ASSETS AND LIABILITIES
	Derivative Portfolio
	Derivative Counterparties
	Our use of cleared derivatives, exchange-traded derivatives, and OTC derivatives exposes us to institutional credit risk. The requirement that we post initial and variation margin in connection with cleared and exchange-traded derivatives, such as cleared interest-rate swaps and futures contracts, exposes us to institutional credit risk in the event that our clearing members or the financial clearinghouses fail to meet their obligations. The use of cleared and exchange-traded derivatives decreases our credit risk exposure to individual counterparties because a central counterparty is substituted for individual counterparties. OTC derivatives expose us to the credit risk of individual counterparties because transactions are executed and settled between us and each counterparty, exposing us to potential losses if a counterparty fails to meet its obligations.
	Our use of interest rate swaps and option-based derivatives is subject to internal credit and legal reviews. On an ongoing basis, we review the credit fundamentals of all of our derivative counterparties, clearinghouses, and clearing members to confirm that they continue to meet our internal risk management standards.
	Master Netting and Collateral Agreements
	We use master netting and collateral agreements to reduce our credit risk exposure to our derivative counterparties for interest-rate swap and option-based derivatives. Master netting agreements provide for the netting of amounts receivable and payable from an individual counterparty, which reduces our exposure to a single counterparty in the event of default. On a daily basis, the market value of each counterparty’s derivatives outstanding is calculated to determine the amount of our net credit exposure, which is equal to derivatives in a net gain position by counterparty after giving consideration to collateral posted.
	Our collateral agreements require most counterparties to post collateral to us for the amount of our net exposure to them above the counterparty’s collateral posting threshold. Collateral posting thresholds are tied to a counterparty’s credit rating. Bilateral collateral agreements are in place for all of our active OTC derivative counterparties. For OTC derivatives, we are subject to collateral posting thresholds based on S&P or Moody’s credit rating of our long-term senior unsecured debt securities. The amount of margin we must post for cleared and exchange-traded derivatives may be based, in part, on S&P or Moody’s credit rating of our long-term senior unsecured debt securities. The lowering or withdrawal of our credit rating by S&P or Moody’s may increase our obligation to post collateral, depending on the amount of the counterparty’s exposure to Freddie Mac with respect to the derivative transactions. Collateral is typically transferred within one business day based on the values of the related derivatives. This time lag in posting collateral can affect our net uncollateralized exposure to derivative counterparties.
	Collateral posted by a derivative counterparty is typically in the form of cash, although U.S. Treasury securities and Freddie Mac mortgage-related securities may also be posted. In the event a counterparty defaults on its obligations under the derivatives agreement and the default is not remedied in the manner prescribed in the agreement, we have the right under the agreement to direct the custodian bank to transfer the collateral to us or to sell the collateral and transfer the proceeds to us. At December 31, 2014 and 2013, all amounts of cash collateral related to derivatives with master netting and collateral agreements were offset against derivative assets, net or derivative liabilities, net, as applicable.
	Our net uncollateralized exposure to derivative counterparties for OTC interest-rate swap, option-based, and foreign-currency swap derivatives was $174 million and $188 million at December 31, 2014 and 2013, respectively. In the event that all of our counterparties for these derivatives were to have defaulted simultaneously on December 31, 2014, our maximum loss for accounting purposes after applying netting agreements and collateral on an individual counterparty basis would have been approximately $174 million. Three counterparties each accounted for greater than 10% and collectively accounted for 81% of our net uncollateralized exposure to derivative counterparties, excluding cleared and exchange-traded derivatives, commitments, swap guarantee derivatives, certain written options, and certain credit derivatives at December 31, 2014. All three of these counterparties, JP Morgan Chase Bank, Barclays Bank PLC, and UBS AG, were rated “A” or above using the lower of S&P’s or Moody’s rating stated in terms of the S&P equivalent as of December 31, 2014.
	Beginning with contracts executed or modified on or after June 10, 2013, the types of interest-rate swaps that we use most frequently became subject to the central clearing requirement. Our exposure to cleared and exchange-traded derivatives was $128 million and $382 million as of December 31, 2014 and 2013, respectively, which includes consideration of the cash collateral that has been posted for initial and variation margin. We net our exposure to cleared derivatives by clearinghouse and clearing member. Exchange-traded derivatives are settled on a daily basis through the payment of variation margin. We post initial and variation margin in connection with our cleared and exchange-traded derivatives. For information about margin we have posted in connection with cleared and exchange-traded derivatives, see “— Collateral Pledged.”
	The total exposure on our forward purchase and sale commitments, which are treated as derivatives, was $40 million and $61 million at December 31, 2014 and 2013, respectively. Many of our transactions involving forward purchase and sale commitments of mortgage-related securities, including our dollar roll transactions, utilize the Mortgage Backed Securities Division of the Fixed Income Clearing Corporation (“MBSD/FICC”) as a clearinghouse. As a clearing member of the clearinghouse, we post margin to the MBSD/FICC and are exposed to the institutional credit risk of the organization.
	The table below displays information related to derivatives and securities purchased under agreements to resell on our consolidated balance sheets.
	Table 10.1 — Offsetting of Financial Assets and Liabilities
		31-Dec-14
		Gross			Amount Offset			Net Amount			Gross Amount			Net
		Amount			in the Consolidated			Presented in			Not Offset in			Amount
		Recognized			Balance Sheets			the Consolidated			the Consolidated
								Balance Sheets(1)			Balance Sheets(2)
		(in millions)
	Assets:
	Derivatives:
	Over-the-counter interest-rate swaps and option-based derivatives	$	10,315		$	(9,688	)	$	627		$	(453	)	$	174
	Cleared and exchange-traded derivatives	379			(251		)	128			—			128
	Other	67			—			67			—			67
	Total derivatives	10,761			(9,939		)	822			(453		)	369
	Securities purchased under agreements to resell	51,903			—			51,903			(51,903		)	—
	Total	$	62,664		$	(9,939	)	$	52,725		$	(52,356	)	$	369
	Liabilities:
	Derivatives:
	Over-the-counter interest-rate swaps and option-based derivatives	$	(10,666	)	$	8,845		$	(1,821	)	$	1,743		$	(78	)
	Cleared and exchange-traded derivatives	(4,277		)	4,252			(25		)	—			(25		)
	Other	(117		)	—			(117		)	—			(117		)
	Total	$	(15,060	)	$	13,097		$	(1,963	)	$	1,743		$	(220	)
		December 31, 2013
		Gross			Amount Offset in			Net Amount			Gross Amount			Net
		Amount			the Consolidated			Presented in the			Not Offset in the			Amount
		Recognized			Balance Sheets			Consolidated			Consolidated
								Balance Sheets(1)			Balance Sheets(2)
		(in millions)
	Assets:
	Derivatives:
	Over-the-counter interest-rate and foreign-currency swaps, and option-based derivatives	$	13,886		$	(13,266	)	$	620		$	(432	)	$	188
	Cleared and exchange-traded derivatives	1,527			(1,145		)	382			—			382
	Other	61			—			61			—			61
	Total derivatives	15,474			(14,411		)	1,063			(432		)	631
	Securities purchased under agreements to resell	62,383			—			62,383			(62,383		)	—
	Total	$	77,857		$	(14,411	)	$	63,446		$	(62,815	)	$	631
	Liabilities:
	Derivatives:
	Over-the-counter interest-rate and foreign-currency swaps, and option-based derivatives	$	(14,616	)	$	14,545		$	(71	)	$	—		$	(71	)
	Cleared and exchange-traded derivatives	(737		)	737			—			—			—
	Other	(109		)	—			(109		)	—			(109		)
	Total	$	(15,462	)	$	15,282		$	(180	)	$	—		$	(180	)
	-1	For derivatives, includes cash collateral posted or held in excess of exposure.
	-2	Does not include the fair value amount of non-cash collateral posted or held that exceeds the associated net asset or liability presented on the consolidated balance sheets. For cleared and exchange-traded derivatives, does not include non-cash collateral posted by us with an aggregate fair value of $2.3 billion and $0.6 billion as of December 31, 2014 and 2013, respectively.
	Collateral Pledged
	Collateral Pledged to Freddie Mac
	Our counterparties are required to pledge collateral for transactions involving securities purchased under agreements to resell. Also, most derivative instruments are subject to collateral posting thresholds as prescribed by the collateral agreements with our counterparties. Under the derivative collateral agreements, U.S. Treasury securities, Freddie Mac mortgage-related securities, and cash may be pledged. We consider the types of securities being pledged to us as collateral when determining how much we lend in transactions involving securities purchased under agreements to resell. Additionally, we regularly review the market values of these securities compared to amounts loaned and derivative counterparty collateral posting thresholds in an effort to manage our exposure to losses.
	We had cash and cash equivalents pledged to us related to OTC derivative instruments of $2.1 billion and $1.9 billion at December 31, 2014 and 2013, respectively. At December 31, 2014 and 2013, we had $453 million and $432 million, respectively, of collateral in the form of securities pledged to and held by us related to OTC derivative instruments. Although it is our practice not to repledge assets held as collateral, a portion of the collateral may be repledged based on master netting agreements related to our derivative instruments. In addition, we had $0 million and $646 million of cash pledged to us related to cleared derivatives at December 31, 2014 and 2013, respectively.
	Also, at December 31, 2014 and 2013, we had $0 billion and $5 billion, respectively, of securities pledged to us for transactions involving securities purchased under agreements to resell that we had the right to repledge. From time to time we may obtain pledges of collateral from certain seller/servicers as additional security for certain of their obligations to us, including their obligations to repurchase mortgages sold to us in breach of representations and warranties. This collateral may, at our discretion, take the form of cash, cash equivalents, or agency securities.
	We did not hold any federal funds sold at December 31, 2014 and 2013.
	Collateral Pledged by Freddie Mac
	We are required to pledge collateral for margin requirements with third-party custodians in connection with secured financings and derivative transactions with some counterparties. The amount of collateral pledged related to our derivative instruments is determined after giving consideration to our credit rating.
The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position on December 31, 2014, was $3.0 billion for which we posted cash and non-cash collateral of $3.0 billion in the normal course of business. Since we were fully collateralized as of December 31, 2014, we would not have been required to post additional collateral on that day if the credit-risk-related contingent features underlying these agreements were triggered.
The table below summarizes all securities pledged as collateral by us, including assets that the secured party may repledge.
Table 10.2 — Collateral in the Form of Securities Pledged
	31-Dec-14			31-Dec-13
	(in millions)
Securities pledged with the ability for the secured party to repledge:
Debt securities of consolidated trusts held by third parties(1)	$	2,539		$	10,654
Available-for-sale securities	9			70
Trading securities	1,884			365
Total securities pledged	$	4,432		$	11,089
-1	Represents PCs held by us in our Investments segment mortgage investments portfolio and pledged as collateral which are recorded as a reduction to debt securities of consolidated trusts held by third parties on our consolidated balance sheets.
Securities Pledged with the Ability of the Secured Party to Repledge
At December 31, 2014, we pledged securities with the ability of the secured party to repledge of $4.4 billion in connection with derivatives and securities transactions.
At December 31, 2013, we pledged securities with the ability of the secured party to repledge of $11.1 billion, of which $10.5 billion was collateral posted in connection with our secured uncommitted intraday line of credit with a third party. This line of credit expired in July 2014. Of the remainder at December 31, 2013, we pledged $0.6 billion in connection with derivative transactions.
Cash Pledged
At December 31, 2014, we pledged $5.4 billion of collateral in the form of cash and cash equivalents, of which $1.2 billion related to our OTC derivative agreements as we had $3.0 billion of such derivatives in a net loss position. The remaining $4.2 billion was posted at clearing members or clearinghouses in connection with derivatives and securities transactions at December 31, 2014.
At December 31, 2013, we pledged $3.4 billion of collateral in the form of cash and cash equivalents, of which $3.2 billion related to our OTC derivative agreements as we had $3.2 billion of such derivatives in a net loss position. The remaining $275 million was posted at clearing members or clearinghouses in connection with derivatives and securities transactions at December 31, 2013.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
STOCKHOLDERS' EQUITY (DEFICIT)	NOTE 11: STOCKHOLDERS’ EQUITY
	Accumulated Other Comprehensive Income
	The table below presents changes in AOCI after the effects of our 35% federal statutory tax rate related to available-for-sale securities, closed cash flow hedges, and our defined benefit plans.
	Table 11.1 — Changes in AOCI by Component, Net of Tax
		Year Ended December 31, 2014
		AOCI Related				AOCI Related				AOCI Related				Total
		to Available-				to Cash Flow				to Defined
		For-Sale				Hedge				Benefit Plans
		Securities				Relationships
		(in millions)
	Beginning balance	$	962			$	(1,000	)		$	32			$	(6	)
	Other comprehensive income before reclassifications(1)	2,087				—				(43		)		2,044
	Amounts reclassified from accumulated other comprehensive income	(503		)		197				(2		)		(308		)
	Changes in AOCI by component	1,584				197				(45		)		1,736
	Ending balance	$	2,546			$	(803	)		$	(13	)		$	1,730
		Year Ended December 31, 2013
		AOCI Related				AOCI Related				AOCI Related				Total
		to Available-				to Cash Flow				to Defined
		For-Sale				Hedge				Benefit Plans
		Securities				Relationships
		(in millions)
	Beginning balance	$	(1,444	)		$	(1,316	)		$	(178	)		$	(2,938	)
	Other comprehensive income before reclassifications(1)	2,659				—				169				2,828
	Amounts reclassified from accumulated other comprehensive income	(253		)		316				41				104
	Changes in AOCI by component	2,406				316				210				2,932
	Ending balance	$	962			$	(1,000	)		$	32			$	(6	)
	-1	For the years ended December 31, 2014 and 2013, net of tax expense of $1.1 billion and $1.4 billion, respectively, for AOCI related to available-for-sale securities.
	Reclassifications from AOCI to Net Income
	The table below presents reclassifications from AOCI to net income, including the affected line item in our consolidated statements of comprehensive income.
	Table 11.2 — Reclassifications from AOCI to Net Income
	Details about Accumulated Other		Three Months Ended December 31,								Year Ended December 31,								Affected Line Item in the Consolidated
	Comprehensive Income Components																		Statements of Comprehensive Income
			2014				2013				2014				2013
			(in millions)
	AOCI related to available-for-sale  securities
			$	500			$	717			$	1,712			$	1,899			Other gains (losses) on investment securities recognized in earnings
			(251		)		(1,297		)		(938		)		(1,510		)		Net impairment of available-for-sale securities recognized in earnings
			249				(580		)		774				389				Total before tax
			(87		)		203				(271		)		(136		)		Tax (expense) or benefit
			162				(377		)		503				253				Net of tax
	AOCI related to cash flow hedge relationships
			—				—				(2		)		(5		)		Interest expense — Other debt
			(71		)		(95		)		(301		)		(455		)		Expense related to derivatives
			(71		)		(95		)		(303		)		(460		)		Total before tax
			25				29				106				144				Tax (expense) or benefit
			(46		)		(66		)		(197		)		(316		)		Net of tax
	AOCI related to defined benefit plans
			1				8				4				2				Salaries and employee benefits
			(1		)		(43		)		(2		)		(43		)		Tax (expense) or benefit
			—				(35		)		2				(41		)		Net of tax
	Total reclassifications in the period		$	116			$	(478	)		$	308			$	(104	)		Net of tax
	Future Reclassifications from AOCI to Net Income Related to Closed Cash Flow Hedges
	As shown in “Table 11.1 — Changes in AOCI by Component, Net of Tax,” the total AOCI related to derivatives designated as cash flow hedges was a loss of $0.8 billion and $1.0 billion at December 31, 2014 and 2013, respectively, composed of deferred net losses on closed cash flow hedges. Closed cash flow hedges involve derivatives that have been terminated or are no longer designated as cash flow hedges. Fluctuations in prevailing market interest rates have no effect on the deferred portion of AOCI relating to losses on closed cash flow hedges.
	The previously deferred amount related to closed cash flow hedges remains in our AOCI balance and will be recognized into earnings over the expected time period for which the forecasted transactions affect earnings, unless it is deemed probable that the forecasted transactions will not occur. Over the next 12 months, we estimate that approximately $166 million, net of taxes, of the $0.8 billion of cash flow hedge losses in AOCI at December 31, 2014 will be reclassified into earnings. The maximum remaining length of time over which we have hedged the exposure related to the variability in future cash flows on forecasted transactions, primarily forecasted debt issuances, is 19 years.
	Issuance of Senior Preferred Stock
	Pursuant to the Purchase Agreement described in “NOTE 2: CONSERVATORSHIP AND RELATED MATTERS,” we issued one million shares of senior preferred stock to Treasury on September 8, 2008. The senior preferred stock was issued to Treasury in partial consideration of Treasury’s commitment to provide funds to us under the Purchase Agreement.
	Shares of the senior preferred stock have a par value of $1, and have a stated value and initial liquidation preference equal to $1,000 per share. The liquidation preference of the senior preferred stock is subject to adjustment. Dividends that are not paid in cash for any dividend period will accrue and be added to the liquidation preference of the senior preferred stock. In addition, any amounts Treasury pays to us pursuant to its funding commitment under the Purchase Agreement and any quarterly commitment fees that are not paid in cash to Treasury nor waived by Treasury will be added to the liquidation preference of the senior preferred stock. As described below, we may make payments to reduce the liquidation preference of the senior preferred stock in limited circumstances. As discussed in “NOTE 2: CONSERVATORSHIP AND RELATED MATTERS — Purchase Agreement,” the quarterly commitment fee has been suspended.
	Treasury, as the holder of the senior preferred stock, is entitled to receive quarterly cash dividends, when, as and if declared by our Board of Directors. Through December 31, 2012, the senior preferred stock accrued quarterly cumulative dividends at a rate of 10% per year. However, under the August 2012 amendment to the Purchase Agreement, the fixed dividend rate was replaced with a net worth sweep dividend beginning in the first quarter of 2013. Total dividends paid in cash during 2014, 2013, and 2012 at the direction of the Conservator were $19.6 billion, $47.6 billion, and $7.2 billion, respectively. See “NOTE 2: CONSERVATORSHIP AND RELATED MATTERS” for a discussion of our net worth sweep dividend.
	The senior preferred stock is senior to our common stock and all other outstanding series of our preferred stock, as well as any capital stock we issue in the future, as to both dividends and rights upon liquidation. The senior preferred stock provides that we may not, at any time, declare or pay dividends on, make distributions with respect to, or redeem, purchase or acquire, or make a liquidation payment with respect to, any common stock or other securities ranking junior to the senior preferred stock unless: (a) full cumulative dividends on the outstanding senior preferred stock (including any unpaid dividends added to the liquidation preference) have been declared and paid in cash; and (b) all amounts required to be paid with the net proceeds of any issuance of capital stock for cash (as described in the following paragraph) have been paid in cash. Shares of the senior preferred stock are not convertible. Shares of the senior preferred stock have no general or special voting rights, other than those set forth in the certificate of designation for the senior preferred stock or otherwise required by law. The consent of holders of at least two-thirds of all outstanding shares of senior preferred stock is generally required to amend the terms of the senior preferred stock or to create any class or series of stock that ranks prior to or on parity with the senior preferred stock.
	We are not permitted to redeem the senior preferred stock prior to the termination of Treasury’s funding commitment set forth in the Purchase Agreement; however, we are permitted to pay down the liquidation preference of the outstanding shares of senior preferred stock to the extent of: (a) accrued and unpaid dividends previously added to the liquidation preference and not previously paid down; and (b) quarterly commitment fees previously added to the liquidation preference and not previously paid down. In addition, if we issue any shares of capital stock for cash while the senior preferred stock is outstanding, the net proceeds of the issuance must be used to pay down the liquidation preference of the senior preferred stock; however, the liquidation preference of each share of senior preferred stock may not be paid down below $1,000 per share prior to the termination of Treasury’s funding commitment. Following the termination of Treasury’s funding commitment, we may pay down the liquidation preference of all outstanding shares of senior preferred stock at any time, in whole or in part. If, after termination of Treasury’s funding commitment, we pay down the liquidation preference of each outstanding share of senior preferred stock in full, the shares will be deemed to have been redeemed as of the payment date.
	The table below provides a summary of our senior preferred stock outstanding at December 31, 2014.
	Table 11.3 — Senior Preferred Stock
	Draw Date		Shares			Shares			Total				Initial				Total
			Authorized			Outstanding			Par Value				Liquidation				Liquidation
									Preference				Preference
									Price per Share
		(in millions, except initial liquidation preference price per share)
8-Sep-08		1			1			$	1			$	1,000			$	1,000
24-Nov-08		—			—			—				N/A				13,800
31-Mar-09		—			—			—				N/A				30,800
30-Jun-09		—			—			—				N/A				6,100
30-Jun-10		—			—			—				N/A				10,600
30-Sep-10		—			—			—				N/A				1,800
30-Dec-10		—			—			—				N/A				100
31-Mar-11		—			—			—				N/A				500
30-Sep-11		—			—			—				N/A				1,479
30-Dec-11		—			—			—				N/A				5,992
30-Mar-12		—			—			—				N/A				146
29-Jun-12		—			—			—				N/A				19
Total, senior preferred stock		1			1			$	1							$	72,336
cash was received from Treasury under the Purchase Agreement in 2014, because we had positive net worth at December 31, 2013, March 31, 2014, June 30, 2014, and September 30, 2014 and, consequently, FHFA did not request a draw on our behalf. At December 31, 2014, our assets exceeded our liabilities under GAAP; therefore no draw is being requested from Treasury under the Purchase Agreement. Our quarterly senior preferred stock dividend is the amount, if any, by which our Net Worth Amount at the end of the immediately preceding fiscal quarter exceeds the applicable Capital Reserve Amount, which was established at $3 billion for 2013 and declines to zero in 2018. Based on our Net Worth Amount at December 31, 2014 and the Capital Reserve Amount of $1.8 billion in 2015, our dividend obligation to Treasury in March 2015 will be $851 million. See “NOTE 2: CONSERVATORSHIP AND RELATED MATTERS — Government Support for our Business” for additional information. The aggregate liquidation preference on the senior preferred stock owned by Treasury was $72.3 billion and $72.3 billion as of December 31, 2014 and 2013, respectively. See “NOTE 18: REGULATORY CAPITAL” for additional information.
Common Stock Warrant
Pursuant to the Purchase Agreement described in “NOTE 2: CONSERVATORSHIP AND RELATED MATTERS,” on September 7, 2008, we issued a warrant to purchase common stock to Treasury. The warrant was issued to Treasury in partial consideration of Treasury’s commitment to provide funds to us under the terms set forth in the Purchase Agreement.
The warrant gives Treasury the right to purchase shares of our common stock equal to 79.9% of the total number of shares of our common stock outstanding on a fully diluted basis on the date of exercise. The warrant may be exercised in whole or in part at any time on or before September 7, 2028, by delivery to us of: (a) a notice of exercise; (b) payment of the exercise price of $0.00001 per share; and (c) the warrant. If the market price of one share of our common stock is greater than the exercise price, then, instead of paying the exercise price, Treasury may elect to receive shares equal to the value of the warrant (or portion thereof being canceled) pursuant to the formula specified in the warrant. Upon exercise of the warrant, Treasury may assign the right to receive the shares of common stock issuable upon exercise to any other person.
We account for the warrant in permanent equity. At issuance on September 7, 2008, we recognized the warrant at fair value, and we do not recognize subsequent changes in fair value while the warrant remains classified in equity. We recorded an aggregate fair value of $2.3 billion for the warrant as a component of additional paid-in-capital. We derived the fair value of the warrant using a modified Black-Scholes model. If the warrant is exercised, the stated value of the common stock issued will be reclassified to common stock in our consolidated balance sheets. The warrant was determined to be in-substance non-voting common stock, because the warrant’s exercise price of $0.00001 per share is considered non-substantive (compared to the market price of our common stock). As a result, the shares associated with the warrant are included in the computation of basic and diluted earnings (loss) per share. The weighted average shares of common stock outstanding for the years ended December 31, 2014, 2013, and 2012, respectively, included shares of common stock that would be issuable upon full exercise of the warrant issued to Treasury.
Preferred Stock
The table below provides a summary of our preferred stock outstanding at their redemption values at December 31, 2014. We have the option to redeem our preferred stock on specified dates, at their redemption price plus dividends accrued through the redemption date. However, without the consent of Treasury, we are restricted from making payments to purchase or redeem preferred stock as well as paying any preferred dividends, other than dividends on the senior preferred stock. In addition, all 24 classes of preferred stock are perpetual and non-cumulative, and carry no significant voting rights or rights to purchase additional Freddie Mac stock or securities. Costs incurred in connection with the issuance of preferred stock are charged to additional paid-in capital.
Table 11.4 — Preferred Stock
	Issue Date	Shares		Shares		Total			Redemption			Total			Redeemable	OTCQB
		Authorized		Outstanding		Par Value			Price per			Outstanding			On or After	Symbol
									Share			Balance
Preferred stock:		(in millions, except redemption price per share)
1996 Variable-rate(1)	26-Apr-96	5		5		$	5		$	50		$	250		30-Jun-01	FMCCI
5.81%	27-Oct-97	3		3		3			50			150			27-Oct-98	-2
5%	23-Mar-98	8		8		8			50			400			31-Mar-03	FMCKK
1998 Variable-rate(3)	September 23 and 29, 1998	4.4		4.4		4.4			50			220			30-Sep-03	FMCCG
5.10%	23-Sep-98	8		8		8			50			400			30-Sep-03	FMCCH
5.30%	28-Oct-98	4		4		4			50			200			30-Oct-00	-2
5.10%	19-Mar-99	3		3		3			50			150			31-Mar-04	-2
5.79%	21-Jul-99	5		5		5			50			250			30-Jun-09	FMCCK
1999 Variable-rate(4)	5-Nov-99	5.75		5.75		5.75			50			287			31-Dec-04	FMCCL
2001 Variable-rate(5)	26-Jan-01	6.5		6.5		6.5			50			325			31-Mar-03	FMCCM
2001 Variable-rate(6)	23-Mar-01	4.6		4.6		4.6			50			230			31-Mar-03	FMCCN
5.81%	23-Mar-01	3.45		3.45		3.45			50			173			31-Mar-11	FMCCO
6%	30-May-01	3.45		3.45		3.45			50			173			30-Jun-06	FMCCP
2001 Variable-rate(7)	30-May-01	4.02		4.02		4.02			50			201			30-Jun-03	FMCCJ
5.70%	30-Oct-01	6		6		6			50			300			31-Dec-06	FMCKP
5.81%	29-Jan-02	6		6		6			50			300			31-Mar-07	-2
2006 Variable-rate(8)	17-Jul-06	15		15		15			50			750			30-Jun-11	FMCCS
6.42%	17-Jul-06	5		5		5			50			250			30-Jun-11	FMCCT
5.90%	16-Oct-06	20		20		20			25			500			30-Sep-11	FMCKO
5.57%	16-Jan-07	44		44		44			25			1,100			31-Dec-11	FMCKM
5.66%	16-Apr-07	20		20		20			25			500			31-Mar-12	FMCKN
6.02%	24-Jul-07	20		20		20			25			500			30-Jun-12	FMCKL
6.55%	28-Sep-07	20		20		20			25			500			30-Sep-17	FMCKI
2007 Fixed-to-floating rate(9)	4-Dec-07	240		240		240			25			6,000			31-Dec-12	FMCKJ
Total, preferred stock		464.17		464.17		$	464.17					$	14,109
-1	Dividend rate resets quarterly and is equal to the sum of three-month LIBOR plus 1% divided by 1.377, and is capped at 9.00%.
-2	Issued through private placement.
-3	Dividend rate resets quarterly and is equal to the sum of three-month LIBOR plus 1% divided by 1.377, and is capped at 7.50%.
-4	Dividend rate resets on January 1 every five years after January 1, 2005 based on a five-year Constant Maturity Treasury rate, and is capped at 11.00%. Optional redemption on December 31, 2004 and on December 31 every five years thereafter.
-5	Dividend rate resets on April 1 every two years after April 1, 2003 based on the two-year Constant Maturity Treasury rate plus 0.10%, and is capped at 11.00%. Optional redemption on March 31, 2003 and on March 31 every two years thereafter.
-6	Dividend rate resets on April 1 every year based on 12-month LIBOR minus 0.20%, and is capped at 11.00%. Optional redemption on March 31, 2003 and on March 31 every year thereafter.
-7	Dividend rate resets on July 1 every two years after July 1, 2003 based on the two-year Constant Maturity Treasury rate plus 0.20%, and is capped at 11.00%. Optional redemption on June 30, 2003 and on June 30 every two years thereafter.
-8	Dividend rate resets quarterly and is equal to the sum of three-month LIBOR plus 0.50% but not less than 4.00%.
-9	Dividend rate is set at an annual fixed rate of 8.375% from December 4, 2007 through December 31, 2012. For the period beginning on or after January 1, 2013, dividend rate resets quarterly and is equal to the higher of: (a) the sum of three-month LIBOR plus 4.16% per annum; or (b) 7.875% per annum. Optional redemption on December 31, 2012, and on December 31 every five years thereafter.
Stock-Based Compensation
Following the implementation of the conservatorship in September 2008, we suspended the operation of our ESPP, and are no longer making grants under our 2004 Employee Plan or our Directors’ Plan. We collectively refer to the 2004 Employee Plan and the 1995 Employee Plan as the Employee Plans. Under the Purchase Agreement, we cannot issue any new options, rights to purchase, participations or other equity interests without Treasury’s prior approval. However, grants outstanding as of the date of the Purchase Agreement remain in effect in accordance with their terms.
We did not repurchase or issue any of our common shares or non-cumulative preferred stock during 2014 and 2013, except for issuances of treasury stock as reported on our consolidated statements of equity relating to stock-based compensation granted prior to conservatorship. Common stock delivered under these stock-based compensation plans consists of treasury stock or shares acquired in market transactions on behalf of the participants. During 2014, restrictions lapsed on 6,610 restricted stock units. At December 31, 2014, 13,731 restricted stock units remained outstanding. There are no remaining restrictions on outstanding restricted stock units. In addition, there were 41,160 shares of restricted stock outstanding at both December 31, 2014 and 2013. No stock options were exercised and 457,430 stock options were forfeited or expired during 2014. At December 31, 2014, 359,005 stock options were outstanding.
For purposes of the earnings-per-share calculation, antidilutive potential common shares excluded from the computation of dilutive potential common shares were 494,227, 998,707, and 1,606,097 at December 31, 2014, 2013, and 2012, respectively.
Dividends Declared
No common dividends were declared in 2014. During the three months ended March 31, 2014, June 30, 2014, September 30, 2014, and December 31, 2014 we paid dividends of $10.4 billion, $4.5 billion, $1.9 billion, and $2.8 billion, respectively, in cash on the senior preferred stock at the direction of our Conservator. We did not declare or pay dividends on any other series of Freddie Mac preferred stock outstanding during 2014.
Delisting of Common Stock and Preferred Stock from NYSE
On July 8, 2010, we delisted our common and 20 previously listed classes of preferred stock from the NYSE pursuant to a directive by our Conservator.
Our common stock and the classes of preferred stock that were previously listed on the NYSE are traded exclusively in the OTCQB Marketplace. Shares of our common stock now trade under the ticker symbol FMCC. We expect that our common stock and the previously listed classes of preferred stock will continue to trade in the OTCQB Marketplace so long as market makers demonstrate an interest in trading the common and preferred stock.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
INCOME TAXES	NOTE 12: INCOME TAXES
	Income Tax (Expense) Benefit
	The table below presents the components of our federal income tax (expense) benefit for 2014, 2013, and 2012. We are exempt from state and local income taxes.
	Table 12.1 — Federal Income Tax (Expense) Benefit
		Year Ended December 31,
		2014			2013				2012
		(in millions)
	Current income tax (expense) benefit	$	(1,028	)	$	(117	)		$	1,540
	Deferred income tax (expense) benefit	(2,284		)	23,422				(3		)
	Total income tax (expense) benefit	$	(3,312	)	$	23,305			$	1,537
	Our income tax benefit for 2013 primarily relates to the release of the valuation allowance against our net deferred tax assets.
	The table below presents a reconciliation between our federal statutory income tax rate and our effective tax rate for 2014, 2013 and 2012.
	Table 12.2 — Reconciliation of Statutory to Effective Tax Rate
		Year Ended December 31,
		2014						2013						2012
		Amount			Percent			Amount				Percent		Amount			Percent
		(dollars in millions)
	Statutory corporate tax rate	$	(3,851	)	35	%		$	(8,877	)		35	%	$	(3,306	)	35	%
	Tax-exempt interest	73			(0.7	)		101				(0.4	)	133			(1.4	)
	Tax credits	438			(4.0	)		495				(2.0	)	536			(5.7	)
	Valuation allowance:
	Current year activity	—			—			5,156				(20.3	)	2,637			(27.9	)
	Release of valuation allowance	—			—			26,369				(104.0	)	—			—
	Unrecognized tax benefits	—			—			—				—		1,205			(12.8	)
	Other	—			—			138				(0.5	)	45			(0.5	)
	Total valuation allowance	—			—			31,663				(124.8	)	3,887			(41.2	)
	Other	28			(0.2	)		(77		)		0.3		287			(3.0	)
	Effective tax rate	$	(3,312	)	30.1	%		$	23,305			(91.9	)%	$	1,537		(16.3	)%
	In 2014, our effective tax rate differed from the statutory rate of 35% primarily due to our recognition of low income housing tax credits. In 2013, our effective tax rate differed from the statutory rate primarily due to the release of the valuation allowance against our net deferred tax assets. In 2012, our effective tax rate differed from the statutory tax rate primarily due to the valuation allowance on a portion of our net deferred tax assets and the recognition of uncertain tax positions.
	Deferred Tax Assets and Liabilities
	The table below presents the balance of significant deferred tax assets and liabilities at December 31, 2014 and 2013.
	Table 12.3 — Deferred Tax Assets and Liabilities
		2014			2013
		(in millions)
	Deferred tax assets:
	Deferred fees	$	6,245		$	5,035
	Basis differences related to derivative instruments	7,059			6,946
	Credit related items and allowance for loan losses	2,311			3,648
	Basis differences related to assets held for investment(1)	1,902			—
	LIHTC and AMT credit carryforward	3,465			3,997
	Net operating loss carryforward	—			3,978
	Other items, net	10			40
	Total deferred tax assets	20,992			23,644
	Deferred tax liabilities:
	Basis differences related to assets held for investment(1)	—			(375		)
	Unrealized gains related to available-for-sale securities	(1,371		)	(518		)
	Basis differences related to debt	(123		)	(35		)
	Total deferred tax liabilities	(1,494		)	(928		)
	Deferred tax assets, net	$	19,498		$	22,716
	-1	Includes a basis adjustment on seriously delinquent loans, which offsets a portion of the deferred tax asset for credit related items and the allowance for loan losses.
	During 2013, we released our valuation allowance previously recorded on our net deferred tax asset.
	As of December 31, 2014, we had a LIHTC carryforward of $3.0 billion that will expire over multiple years beginning in 2028. Our AMT credit carryforward of $433 million will not expire.
	Valuation Allowance
	On a quarterly basis, we determine whether a valuation allowance is necessary on our net deferred tax asset. In doing so, we consider all evidence available, both positive and negative, in determining whether, based on the weight of the evidence, it is more likely than not that the deferred tax assets will be realized. In conducting our assessment at December 31, 2014, we evaluated all available objective evidence including, but not limited to: (a) our three-year cumulative income position; (b) the trend of our financial and tax results; (c) the amount of taxable income reported in our 2013 federal income tax return; (d) our tax credit carryforward and the length of the carryforward period available to utilize this asset under current tax law; and (e) our access to capital under the agreements associated with conservatorship. Furthermore, we evaluated all available subjective evidence, including but not limited to: (a) difficulty in predicting unsettled circumstances related to the conservatorship; (b) our estimated 2014 taxable income; and (c) forecasts of future book and tax income. Our consideration of the evidence requires significant judgment regarding estimates and assumptions that are inherently uncertain, particularly about our future business structure and financial results.
	We are not permitted to consider the impacts proposed legislation may have on our business operations or the mortgage industry in our analysis because the timing and certainty of those actions are unknown and beyond our control.
	The positive evidence at December 31, 2014, that outweighed the negative evidence included the following:
	•	Our three-year cumulative income position;
	•	The 2013 taxable income reported in our federal tax return which was filed in 2014;
	•	Our forecasted 2014 and future period taxable income;
	•	Our LIHTC carryforwards do not begin to expire until 2028; and
	•	The continuing positive trend in the housing market.
	At December 31, 2014, we determined that the positive evidence related to the realizability of our deferred tax assets, particularly the evidence that was objectively verifiable, outweighed the negative evidence. Accordingly, we concluded that it is more likely than not that our deferred tax assets will be realized and determined that a valuation allowance against our net deferred tax asset was not necessary at December 31, 2014.
	On February 2, 2015, the Administration submitted the full year 2016 U.S. budget to Congress. Included within the budget is a proposal to reduce the top U.S. corporate tax rate. If enacted, a reduction in the corporate tax rate would result in a charge representing the reduction in the realizable value of our net deferred tax asset.
	In future quarters we will continue to evaluate our ability to realize the net deferred tax asset. If evidence in future periods changes such that it is more likely than not that part or all of the net deferred tax asset will not be realized, we will reestablish a valuation allowance at that time.
Unrecognized Tax Benefits and IRS Examinations
We have evaluated all income tax positions and determined that there are no uncertain tax positions that require reserves as of December 31, 2014.
The IRS has examined our income tax returns for tax years 2008 through 2011. We are currently working with the IRS to finalize the stipulation of settled issues and closing agreement for years 1998 through 2010 related to our tax accounting method for certain hedging transactions, and expect that a final decision can be entered within the next 12 months. For additional information, see “NOTE 17: LEGAL CONTINGENCIES.”
We have accrued gross interest receivable of $535 million and $529 million as of December 31, 2014 and 2013, respectively, related to payments on account with the IRS. We anticipate refunds of accrued interest receivable upon final settlement of the Statutory Notices for the 1998 to 2005 tax years.
For a discussion of our significant accounting policies related to income taxes, please see “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES."

Segment_Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
SEGMENT REPORTING	NOTE 13: SEGMENT REPORTING
	We evaluate segment performance and allocate resources based on a Segment Earnings approach, subject to the conduct of our business under the direction of the Conservator. See “NOTE 2: CONSERVATORSHIP AND RELATED MATTERS” for additional information about the conservatorship.
	We present Segment Earnings by: (a) reclassifying certain credit guarantee-related activities and investment-related activities between various line items on our GAAP consolidated statements of comprehensive income; and (b) allocating certain revenues and expenses, including certain returns on assets and funding costs, and all administrative expenses to our three reportable segments. The reclassifications and the allocations are described below.
	We do not consider our assets by segment when evaluating segment performance or allocating resources. We operate our business solely in the U.S. and its territories. Therefore, we do not generate any revenue from and do not have any long-lived assets other than financial instruments in geographic locations outside of the U.S. and its territories.
	Segments
	We have three reportable segments, which are based on the type of business activities each performs — Single-family Guarantee, Investments, and Multifamily. The chart below provides a summary of our three reportable segments and the All Other category as of December 31, 2014. Certain immaterial changes were made to our Segment Earnings definitions in 2014. As reflected in the chart, certain activities that are not part of a reportable segment are included in the All Other category. The All Other category consists of material corporate level activities that are: (a) infrequent in nature; and (b) based on decisions outside the control of the management of our reportable segments. By recording these types of activities to the All Other category, we believe the financial results of our three reportable segments reflect the decisions and strategies that are executed within the reportable segments and provide greater comparability across time periods.
	Segment	Description	Activities/Items
	Single-family Guarantee	The Single-family Guarantee segment reflects results from our single-family credit guarantee activities. In our Single-family Guarantee segment, we purchase and guarantee single-family mortgage loans originated by our seller/servicers in the primary mortgage market and manage our seriously delinquent loans. In most instances, we use the mortgage securitization process to package the mortgage loans into guaranteed mortgage-related securities. We guarantee the payment of principal and interest on the mortgage-related securities in exchange for management and guarantee fees. Segment Earnings for this segment consist primarily of management and guarantee fee revenues, including amortization of upfront fees, less credit-related expenses, administrative expenses, allocated funding costs, and amounts related to net float benefits or expenses.	•	Management and guarantee fees on PCs, including those retained by us, and single-family mortgage loans in the mortgage investments portfolio, inclusive of up-front credit delivery and buy-down fees
			•	Recognition and remittance to Treasury of guarantee fees resulting from the 10 basis point legislated increase
			•	Adjustments for the price performance of our PCs relative to comparable Fannie Mae securities
			•	Costs and recoveries of risk transfer transactions
			•	Credit losses on all single-family assets
			•	Guarantee buy-downs
			•	Expected net float income or expense on the single-family credit guarantee portfolio
			•	Tax expense/benefit and changes in the deferred tax asset valuation allowance (if any)
			•	Allocated debt costs, administrative expenses and taxes
			•	Representation and warranty settlements
	Investments	The Investments segment reflects results from three primary activities: (a) managing the company’s mortgage-related investments portfolio, excluding Multifamily segment investments and single-family seriously delinquent loans; (b) managing the treasury function for the entire company, including funding and liquidity; and (c) managing interest-rate risk for the entire company. In our Investments segment, we invest principally in mortgage-related securities and single-family performing mortgage loans. Segment Earnings for this segment consist primarily of the returns on these investments, less the related funding, hedging, and administrative expenses.	•	Investments in mortgage-related securities and single-family performing mortgage loans
			•	All other traded instruments / securities, excluding CMBS and multifamily housing revenue bonds
			•	Debt issuances
			•	Interest rate risk management returns
			•	Guarantee buy-ups, net of execution gains / losses
			•	Cash and liquidity management
			•	Tax expense/benefit and changes in the deferred tax asset valuation allowance (if any)
			•	Allocated administrative expenses and taxes
			•	Non-agency mortgage-related securities settlements
	Multifamily	The Multifamily segment reflects results from our investment (both purchases and sales), securitization, and guarantee activities in multifamily mortgage loans and securities. Our primary business model is to purchase multifamily mortgage loans for aggregation and then securitization through issuance of multifamily K Certificates. To a lesser extent, we provide guarantees of the payment of principal and interest on tax-exempt multifamily pass-through certificates backed by multifamily housing revenue bonds. In addition, we guarantee the payment of principal and interest on tax-exempt multifamily housing revenue bonds secured by low- and moderate-income multifamily mortgage loans. Segment Earnings for this segment consist primarily of returns on assets related to multifamily investment activities and management and guarantee fee income, less credit-related expenses, administrative expenses, and allocated funding costs.	•	Multifamily mortgage loans held-for-sale and associated securitization activities
			•	Investments in CMBS, multifamily housing revenue bonds, and multifamily mortgage loans held-for-investment
			•	Allocated debt costs, administrative expenses and taxes
			•	Other guarantee commitments on multifamily housing revenue bonds
			•	Other Structured Securities of multifamily housing revenue bonds
			•	Tax expense/benefit and changes in the deferred tax asset valuation allowance (if any)
	All Other	The All Other category consists of material corporate-level activities that are: (a) infrequent in nature; and (b) based on decisions outside the control of the management of our reportable segments.	•	Tax settlements, as applicable
			•	Legal settlements, as applicable
			•	Tax expense/benefit and changes in the deferred tax asset valuation allowance (if any), including the release of the deferred tax asset valuation allowance
			•	Termination of our pension plan
	Segment Earnings
	The financial performance of our Single-family Guarantee segment is measured based on its contribution to GAAP net income (loss). Our Investments segment and Multifamily segment are measured based on each segment's contribution to GAAP comprehensive income (loss), which consists of the sum of its contribution to: (a) GAAP net income (loss); and (b) GAAP total other comprehensive income (loss), net of taxes. Taxes for the reportable segments are generally calculated by applying our corporate annual effective tax rate to each segment's pre-tax income.
	The sum of Segment Earnings for each segment and the All Other category equals GAAP net income (loss). Likewise, the sum of comprehensive income (loss) for each segment and the All Other category equals GAAP comprehensive income (loss). However, the accounting principles we apply to present certain financial statement line items in Segment Earnings for our reportable segments, in particular Segment Earnings management and guarantee income and net interest income, differ significantly from those applied in preparing the comparable line items in our consolidated financial statements prepared in accordance with GAAP. Accordingly, the results of such line items differ significantly from, and should not be used as a substitute for, the comparable line items as determined in accordance with GAAP. For reconciliations of the Segment Earnings line items to the comparable line items in our consolidated financial statements prepared in accordance with GAAP, see “Table 13.2 — Segment Earnings and Reconciliation to GAAP Results.”
	In 2014, we revised our inter-segment allocations between the Multifamily and the Investments segments for the Multifamily segment's investment securities and held-for-sale loans. As a result of this change, the Multifamily segment reflects the entire change in fair value of these assets in its financial results, and the Investments segment transfers the change in fair value of the derivatives associated with the Multifamily segment's investments securities and held-for-sale loans to the Multifamily segment. The purpose of this change is to better reflect the operations of the Multifamily segment on a stand-alone basis. Prior period results have been revised to conform with the current period presentation.
	Many of the reclassifications, adjustments and allocations described below relate to the amendments to the accounting guidance for transfers of financial assets and consolidation of VIEs, which we adopted effective January 1, 2010. These amendments require us to consolidate our single-family PC trusts and certain Other Guarantee Transactions, which makes it difficult to view the results of the three operating segments from a GAAP perspective. For example, as a result of the amendments, the net guarantee fee earned on mortgage loans held by our consolidated trusts is included in net interest income on our GAAP consolidated statements of comprehensive income. Through the reclassifications described below, we move the net guarantee fees earned on mortgage loans into Segment Earnings management and guarantee income.
	Credit Guarantee Activity-Related Reclassifications
	In preparing certain line items within Segment Earnings, we make various reclassifications to earnings determined under GAAP related to our credit-guarantee activities, including those described below. All credit guarantee-related income and costs are included in Segment Earnings management and guarantee income.
	•	Net guarantee fee is reclassified in Segment Earnings from net interest income to management and guarantee income.
	•	Implied management and guarantee fee related to unsecuritized mortgage loans held in the mortgage investments portfolio is reclassified in Segment Earnings from net interest income to management and guarantee income.
	•	The portion of the amount reversed for accrued but uncollected interest upon placing loans on a non-accrual status that relates to guarantee fees is reclassified in Segment Earnings from net interest income to management and guarantee income. The remaining portion of the allowance for lost interest is reclassified in Segment Earnings from net interest income to provision for credit losses.
	Investment Activity-Related Reclassifications
	In preparing certain line items within Segment Earnings, we make various reclassifications to earnings determined under GAAP related to our investment activities, including those described below. Through these reclassifications, we move certain items into or out of net interest income so that, on a Segment Earnings basis, net interest income reflects how we measure the effective yield earned on securities held in our mortgage investments portfolio and our cash and other investments portfolio.
	We use derivatives extensively in our investment activity. The reclassifications described below allow us to reflect, in Segment Earnings net interest income, the costs associated with this use of derivatives.
	•	The accrual of periodic cash settlements of all derivatives is reclassified in Segment Earnings from derivative gains (losses) into net interest income to fully reflect the periodic cost associated with the protection provided by these contracts.
	•	Up-front cash paid or received upon the purchase or writing of swaptions and other option contracts is reclassified in Segment Earnings prospectively on a straight-line basis from derivative gains (losses) into net interest income over the contractual life of the instrument to fully reflect the periodic cost associated with the protection provided by these contracts.
	Amortization related to certain items is not relevant to how we measure the effective yield earned on the securities held in our investments portfolios. Therefore, as described below, we reclassify these items in Segment Earnings from net interest income to non-interest income.
	•	Amortization related to derivative commitment basis adjustments associated with mortgage-related and non-mortgage-related securities.
	•	Amortization related to accretion of other-than-temporary impairments on available-for-sale securities held.
	•	Amortization related to premiums and discounts associated with PCs and Other Guarantee Transactions issued by our consolidated trusts that we previously held and subsequently transferred to third parties. The amortization is related to deferred gains (losses) on transfers of these securities.
	Segment Adjustments
	In presenting Segment Earnings management and guarantee income and net interest income, we make adjustments to better reflect how management measures and assesses the performance of each segment and the company as a whole. These adjustments relate to amounts that are not reflected in net income (loss) as determined in accordance with GAAP. These adjustments are reversed through the segment adjustments line item within Segment Earnings, so that Segment Earnings (loss) for each segment equals GAAP net income (loss) for each segment. Segment adjustments consist of the following:
	•	We adjust our Segment Earnings management and guarantee income for the Single-family Guarantee segment to include the amortization of buy-down fees and credit delivery fees recorded in periods prior to the January 1, 2010 adoption of accounting guidance for the transfers of financial assets and the consolidation of VIEs. As of December 31, 2014, the unamortized balance of buy-down fees was $0.3 billion and the unamortized balance of credit delivery fees was $0.7 billion. We consider such fees to be part of the effective rate of the guarantee fee on guaranteed mortgage loans. These adjustments are necessary to better reflect the realization of revenue associated with guarantee contracts over the life of the underlying loans.
	•	We adjust our Segment Earnings net interest income for the Investments segment to include the amortization of cash premiums and discounts, as well as buy-up fees, on the consolidated Freddie Mac mortgage-related securities we purchase as investments. As of December 31, 2014, the unamortized balance of such premiums and discounts, net was $3.5 billion and the unamortized balance of buy-up fees was $0.4 billion. These adjustments are necessary to reflect the effective yield realized on investments in consolidated Freddie Mac mortgage-related securities purchased at a premium or discount or with buy-up fees.
	Segment Allocations
	The results of each reportable segment include directly attributable revenues and expenses. Administrative expenses that are not directly attributable to a segment are allocated to our segments using various methodologies, depending on the nature of the expense (i.e., semi-direct versus indirect). Net interest income for each segment includes allocated debt funding and hedging costs related to certain assets of each segment. The Investments segment manages the funding and interest rate risk for all business segments. In connection with this activity, the Investments segment transfers a cost to the other segments. The actual costs may vary relative to these intra-company transfers. In addition, the financial statement volatility associated with the use of derivatives to hedge certain assets outside the Investments segment is not fully allocated to other segments. These allocations do not include the effects of dividends paid on our senior preferred stock. The release of the deferred tax asset valuation allowance, termination of our pension plan, and legal and tax settlements, as applicable, are allocated to the All Other category.
	The table below presents Segment Earnings by segment.
	Table 13.1 — Summary of Segment Earnings and Comprehensive Income (Loss)
		Year Ended December 31,
	2014			2013			2012
	(in millions)
Segment Earnings (loss), net of taxes:
Single-family Guarantee	$	1,547		$	5,796		$	(164	)
Investments	4,520			15,930			7,367
Multifamily	1,636			3,050			2,991
All Other	(13		)	23,892			788
Total Segment Earnings, net of taxes	7,690			48,668			10,982
Net income	$	7,690		$	48,668		$	10,982
Comprehensive income (loss) of segments:
Single-family Guarantee	$	1,537		$	5,845		$	(227	)
Investments	6,471			20,287			11,397
Multifamily	1,459			1,455			4,081
All Other	(41		)	24,013			788
Comprehensive income of segments	9,426			51,600			16,039
Comprehensive income	$	9,426		$	51,600		$	16,039
The table below presents detailed reconciliations between our GAAP financial statements and Segment Earnings by financial statement line item for our reportable segments and All Other.
Table 13.2 — Segment Earnings and Reconciliation to GAAP Results
	Year Ended December 31, 2014
													Total Segment			Reconciliation to Consolidated Statements of									Total per
													Earnings (Loss),			Comprehensive Income									Consolidated
													Net of Tax												Statements of
																									Comprehensive
	Single-family			Investments			Multifamily			All						Reclassifications			Segment			Total			Income
	Guarantee									Other									Adjustments			Reconciling
																						Items
	(in millions)
Net interest income	$	(111	)	$	2,966		$	948		$	—		$	3,803		$	9,825		$	635		$	10,460		$	14,263
(Provision) benefit for credit losses	(982		)	—			55			—			(927		)	869			—			869			(58		)
Non-interest income (loss):
Management and guarantee income(1)	5,172			—			254			—			5,426			(4,794		)	(303		)	(5,097		)	329
Net impairment of available-for-sale securities recognized in earnings	—			(140		)	—			—			(140		)	(798		)	—			(798		)	(938		)
Derivative gains (losses)	7			(5,158		)	335			—			(4,816		)	(3,475		)	—			(3,475		)	(8,291		)
Gains (losses) on trading securities	—			(276		)	58			—			(218		)	—			—			—			(218		)
Gains (losses) on mortgage loans	(139		)	—			870			—			731			—			—			—			731
Other non-interest income	844			8,881			176			—			9,901			(1,627		)	—			(1,627		)	8,274
Non-interest expense:
Administrative expense	(1,170		)	(437		)	(274		)	—			(1,881		)	—			—			—			(1,881		)
REO operations income (expense)	(205		)	—			9			—			(196		)	—			—			—			(196		)
Temporary Payroll Tax Cut Continuation Act of 2011 expense	(775		)	—			—			—			(775		)	—			—			—			(775		)
Other non-interest expense	(191		)	(6		)	(23		)	(18		)	(238		)	—			—			—			(238		)
Segment adjustments	(303		)	635			—			—			332			—			(332		)	(332		)	—
Income tax (expense) benefit	(600		)	(1,945		)	(772		)	5			(3,312		)	—			—			—			(3,312		)
Net income (loss)	1,547			4,520			1,636			(13		)	7,690			—			—			—			7,690
Changes in unrealized gains (losses) related to available-for-sale securities	—			1,759			(175		)	—			1,584			—			—			—			1,584
Changes in unrealized gains (losses) related to cash flow hedge relationships	—			197			—			—			197			—			—			—			197
Changes in defined benefit plans	(10		)	(5		)	(2		)	(28		)	(45		)	—			—			—			(45		)
Total other comprehensive income (loss), net of taxes	(10		)	1,951			(177		)	(28		)	1,736			—			—			—			1,736
Comprehensive income (loss)	$	1,537		$	6,471		$	1,459		$	(41	)	$	9,426		$	—		$	—		$	—		$	9,426
	Year Ended December 31, 2013
													Total Segment			Reconciliation to Consolidated Statements of									Total per
													Earnings (Loss),			Comprehensive Income									Consolidated
													Net of Tax												Statements of
																									Comprehensive
	Single-family			Investments			Multifamily			All						Reclassifications			Segment			Total			Income
	Guarantee									Other									Adjustments			Reconciling
																						Items
	(in millions)
Net interest income	$	320		$	3,525		$	1,186		$	—		$	5,031		$	10,400		$	1,037		$	11,437		$	16,468
Benefit for credit losses	1,409			—			218			—			1,627			838			—			838			2,465
Non-interest income (loss):
Management and guarantee income(1)	4,930			—			206			—			5,136			(4,171		)	(694		)	(4,865		)	271
Net impairment of available-for-sale securities recognized in earnings	—			(974		)	(15		)	—			(989		)	(521		)	—			(521		)	(1,510		)
Derivative gains (losses)	(3		)	5,543			1,281			—			6,821			(4,189		)	—			(4,189		)	2,632
Gains (losses) on trading securities	—			(1,466		)	(132		)	—			(1,598		)	—			—			—			(1,598		)
Gains (losses) on mortgage loans	—			—			(336		)	—			(336		)	—			—			—			(336		)
Other non-interest income	1,165			8,902			1,350			—			11,417			(2,357		)	—			(2,357		)	9,060
Non-interest expense:
Administrative expense	(1,025		)	(523		)	(257		)	—			(1,805		)	—			—			—			(1,805		)
REO operations income (expense)	124			—			16			—			140			—			—			—			140
Temporary Payroll Tax Cut Continuation Act of 2011 expense	(533		)	—			—			—			(533		)	—			—			—			(533		)
Other non-interest expense (income)	(179		)	349			(24		)	(37		)	109			—			—			—			109
Segment adjustments	(694		)	1,037			—			—			343			—			(343		)	(343		)	—
Income tax (expense) benefit	282			(463		)	(443		)	23,929			23,305			—			—			—			23,305
Net income (loss)	5,796			15,930			3,050			23,892			48,668			—			—			—			48,668
Changes in unrealized gains (losses) related to available-for-sale securities	—			4,010			(1,604		)	—			2,406			—			—			—			2,406
Changes in unrealized gains (losses) related to cash flow hedge relationships	—			316			—			—			316			—			—			—			316
Changes in defined benefit plans	49			31			9			121			210			—			—			—			210
Total other comprehensive income (loss), net of taxes	49			4,357			(1,595		)	121			2,932			—			—			—			2,932
Comprehensive income	$	5,845		$	20,287		$	1,455		$	24,013		$	51,600		$	—		$	—		$	—		$	51,600
	Year Ended December 31, 2012
													Total Segment			Reconciliation to Consolidated Statements of									Total per
													Earnings (Loss),			Comprehensive Income									Consolidated
													Net of Tax												Statements of
																									Comprehensive
	Single-family			Investments			Multifamily			All						Reclassifications			Segment			Total			Income
	Guarantee									Other									Adjustments			Reconciling
																						Items
	(in millions)
Net interest income	$	(147	)	$	5,726		$	1,291		$	—		$	6,870		$	9,942		$	799		$	10,741		$	17,611
Benefit (provision) for credit losses	(3,168		)	—			123			—			(3,045		)	1,155			—			1,155			(1,890		)
Non-interest income (loss):
Management and guarantee income(1)	4,389			—			151			—			4,540			(3,507		)	(832		)	(4,339		)	201
Net impairment of available-for-sale securities recognized in earnings	—			(1,831		)	(123		)	—			(1,954		)	(214		)	—			(214		)	(2,168		)
Derivative gains (losses)	—			1,034			943			—			1,977			(4,425		)	—			(4,425		)	(2,448		)
Gains (losses) on trading securities	—			(1,794		)	120			—			(1,674		)	—			—			—			(1,674		)
Gains (losses) on mortgage loans	—			—			1,010			—			1,010			—			—			—			1,010
Other non-interest income	931			2,719			297			—			3,947			(2,951		)	—			(2,951		)	996
Non-interest expense:
Administrative expense	(890		)	(430		)	(241		)	—			(1,561		)	—			—			—			(1,561		)
REO operations income (expense)	(62		)	—			3			—			(59		)	—			—			—			(59		)
Temporary Payroll Tax Cut Continuation Act of 2011 expense	(108		)	—			—			—			(108		)	—			—			—			(108		)
Other non-interest expense	(285		)	(1		)	(129		)	(50		)	(465		)	—			—			—			(465		)
Segment adjustments	(832		)	799			—			—			(33		)	—			33			33			—
Income tax (expense) benefit	8			1,145			(454		)	838			1,537			—			—			—			1,537
Net income (loss)	(164		)	7,367			2,991			788			10,982			—			—			—			10,982
Changes in unrealized gains (losses) related to available-for-sale securities	—			3,666			1,103			—			4,769			—			—			—			4,769
Changes in unrealized gains (losses) related to cash flow hedge relationships	—			414			—			—			414			—			—			—			414
Changes in defined benefit plans	(63		)	(50		)	(13		)	—			(126		)	—			—			—			(126		)
Total other comprehensive income (loss), net of taxes	(63		)	4,030			1,090			—			5,057			—			—			—			5,057
Comprehensive income (loss)	$	(227	)	$	11,397		$	4,081		$	788		$	16,039		$	—		$	—		$	—		$	16,039
-1	Management and guarantee income is included in other income on our GAAP consolidated statements of comprehensive income.

Financial_Guarantees

Financial Guarantees	12 Months Ended
	Dec. 31, 2014
Guarantees [Abstract]
FINANCIAL GUARANTEES	NOTE 14: FINANCIAL GUARANTEES
	We provide financial guarantees to securitization trusts that issue mortgage-related securities backed by single-family mortgage loans, which we consolidate. During the years ended December 31, 2014 and 2013, we issued approximately $257.2 billion and $425.6 billion, respectively, in UPB of Freddie Mac mortgage-related securities backed by single-family mortgage loans (excluding those backed by HFA bonds). For guarantees to consolidated securitization trusts, our exposure to these guarantees is generally the UPB of the loans recorded on our consolidated balance sheets.
	We also provide guarantees to non-consolidated securitization trusts that issue mortgage-related securities as well as in other guarantee commitments. If we are exposed to incremental credit risk by providing these guarantees, we charge a management and guarantee fee and recognize a guarantee asset, guarantee obligation, and a reserve for guarantee losses, as necessary.
	The table below presents our maximum potential exposure, our recognized liability, and the maximum remaining term of our financial guarantees that are not consolidated on our balance sheets.
	Table 14.1 — Financial Guarantees
		December 31, 2014					31-Dec-13
		Maximum		Recognized		Maximum	Maximum		Recognized		Maximum
		Exposure(1)		Liability(2)		Remaining	Exposure(1)		Liability(2)		Remaining
						Term					Term
		(dollars in millions, terms in years)
	Non-consolidated Freddie Mac securities	$	87,529	$	861	39	$	71,809	$	731	40
	Other guarantee commitments	26,147		772		39	29,160		791		36
	Derivative instruments	21,336		154		31	9,856		239		32
	-1	The maximum exposure represents the contractual amounts that could be lost if counterparties or borrowers defaulted, without consideration of possible recoveries under credit enhancement arrangements, such as recourse provisions, third-party insurance contracts, or from collateral held or pledged. The maximum exposure disclosed above is not representative of the actual loss we are likely to incur, based on our historical loss experience and after consideration of proceeds from related collateral liquidation. The maximum exposure for our liquidity guarantees is not mutually exclusive of our default guarantees on the same securities; therefore, these amounts are included within the maximum exposure of non-consolidated Freddie Mac securities and other guarantee commitments.
	-2	For non-consolidated Freddie Mac securities and other guarantee commitments, this amount represents the guarantee obligation on our consolidated balance sheets. This amount excludes our reserve for guarantee losses, which totaled $126 million and $111 million as of December 31, 2014 and 2013, respectively, and is included within other liabilities on our consolidated balance sheets.
	Non-Consolidated Freddie Mac Securities
	We issue three types of mortgage-related securities: (a) PCs; (b) REMICs and Other Structured Securities; and (c) Other Guarantee Transactions. We guarantee the payment of principal and interest to the trusts which issue these securities, which are backed by pools of mortgage-related assets, irrespective of the cash flows received from the borrowers.
	Our single-family securities issued in resecuritizations of our PCs and other previously issued REMICs and Other Structured Securities are not consolidated unless we hold substantially all of the beneficial interests of the trust and are therefore considered the primary beneficiary of the trust. Our resecuritizations of PCs and other previously issued REMICs and Structured Securities do not give rise to any additional exposure to credit loss as we already consolidate the underlying collateral. The securities issued in these resecuritizations consist of single-class and multiclass securities backed by PCs, REMICs, interest-only strips, and principal-only strips. Since these resecuritizations do not increase our credit-risk, no guarantee asset or guarantee obligation is recognized for these transactions and they are excluded from the table above.
	During 2014 and 2013, we issued approximately $18.5 billion and $23.7 billion, respectively, in UPB of Other Guarantee Transactions, all of which were backed by multifamily mortgage loans, for which a guarantee asset and guarantee obligation were recognized.
	For many of the loans underlying our non-consolidated guarantees, there are credit protections from third parties, including subordination, covering a portion of our exposure. See “NOTE 4: MORTGAGE LOANS AND LOAN LOSS RESERVES” for information about credit protections on loans we guarantee.
	Other Guarantee Commitments
	We provide long-term standby commitments to certain of our customers, which obligate us to purchase seriously delinquent loans that are covered by those agreements. During 2014 and 2013, we issued and guaranteed $2.6 billion and $9.9 billion, respectively, in UPB of long-term standby commitments. These long-term standby commitments totaled $16.5 billion and $19.2 billion in UPB at December 31, 2014 and December 31, 2013, respectively. Periodically, certain of our customers seek to terminate long-term standby commitments and simultaneously enter into guarantor swap transactions to obtain our PCs backed by many of the same mortgage loans.
	We also had other guarantee commitments on multifamily housing revenue bonds that were issued by HFAs of $9.3 billion and $9.1 billion in UPB at December 31, 2014 and December 31, 2013, respectively. In addition, as of December 31, 2014 and December 31, 2013, we had issued guarantees under the TCLFP on securities backed by HFA bonds with UPB of $0.4 billion and $0.9 billion, respectively.
	Derivative Instruments
	Derivative instruments include written options, written swaptions, interest-rate swap guarantees, and short-term default guarantee commitments accounted for as credit derivatives. See “NOTE 9: DERIVATIVES” for further discussion of these derivative guarantees.
	We guarantee the performance of interest-rate swap contracts in two circumstances. First, in connection with certain other guarantee commitments, we guarantee that a multifamily borrower will perform under an interest-rate swap contract linked to the borrower’s ARM. And second, in connection with our issuance of certain REMICs and Other Structured Securities, which are backed by tax-exempt bonds, we guarantee that the sponsor of the transaction will perform under the interest-rate swap contract linked to the senior variable-rate certificates that we issued.
	We also have issued certain REMICs and Other Structured Securities with stated final maturities that are shorter than the stated maturity of the underlying mortgage loans. If the underlying mortgage loans to these securities have not been purchased by a third party or fully matured as of the stated final maturity date of such securities, we will sponsor an auction of the underlying assets. To the extent that purchase or auction proceeds are insufficient to cover unpaid principal amounts due to investors in such REMICs and Other Structured Securities, we are obligated to fund such principal. Our maximum exposure on these derivative guarantees represents the outstanding UPB of the REMICs and Other Structured Securities subject to stated final maturities.
	Other Indemnifications
	In connection with certain business transactions, we may provide indemnification to counterparties for claims arising out of breaches of certain obligations (e.g., those arising from representations and warranties) in contracts entered into in the normal course of business. Our assessment is that the risk of any material loss from such a claim for indemnification is remote and there are no significant probable and estimable losses associated with these contracts. In addition, we provided indemnification for litigation defense costs to certain former officers who are subject to ongoing litigation. See “NOTE 17: LEGAL CONTINGENCIES” for further information on ongoing litigation. The recognized liabilities on our consolidated balance sheets related to indemnifications were not significant at December 31, 2014 and 2013.
	As part of the guarantee arrangements pertaining to multifamily housing revenue bonds, we provided commitments to advance funds, commonly referred to as “liquidity guarantees.” These guarantees require us to advance funds to enable others to repurchase any tendered tax-exempt and related taxable bonds that are unable to be remarketed. Any such advances are treated as loans and are secured by a pledge to us of the repurchased securities until the securities are remarketed. No advances under these liquidity guarantees were outstanding at December 31, 2014 and 2013.

Concentration_of_Credit_and_Ot

Concentration of Credit and Other Risks	12 Months Ended
	Dec. 31, 2014
Risks and Uncertainties [Abstract]
CONCENTRATION OF CREDIT AND OTHER RISKS	NOTE 15: CONCENTRATION OF CREDIT AND OTHER RISKS
	Single-Family Credit Guarantee Portfolio
	The table below summarizes the concentration by year of origination and geographic area of the approximately $1.7 trillion UPB of our single-family credit guarantee portfolio at both December 31, 2014 and 2013. See “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES,” "NOTE 4: MORTGAGE LOANS AND LOAN LOSS RESERVES,” and “NOTE 7: INVESTMENTS IN SECURITIES” for more information about credit risk associated with loans and mortgage-related securities that we hold or guarantee.
	Table 15.1 — Concentration of Credit Risk — Single-Family Credit Guarantee Portfolio
		31-Dec-14					31-Dec-13						Percent of Credit Losses(1) Twelve Months Ended
		Percentage  of		Serious			Percentage  of			Serious			31-Dec-14		31-Dec-13
		Portfolio(1)		Delinquency			Portfolio(1)			Delinquency
				Rate						Rate
	Year of Origination
	2014	12	%	0.02	%		N/A			N/A			—	%	N/A
	2013	16		0.06			16	%		0.01	%		—		—	%
	2012	14		0.09			16			0.04			—		—
	2011	6		0.26			8			0.18			—		—
	2010	6		0.46			7			0.39			1		1
	2009	6		0.92			7			0.88			2		2
	Subtotal - New single-family book	60		0.24			54			0.24			3		3
	HARP and other relief refinance loans(2)	20		0.75			21			0.64			8		7
	2005 to 2008 Legacy single-family book	13		7.59			16			8.77			81		81
	Pre-2005 Legacy single-family book	7		3.1			9			3.24			8		9
	Total	100	%	1.88	%		100	%		2.39	%		100	%	100	%
	Region(3)
	West	29	%	1.23	%		28	%		1.73	%		13	%	24	%
	Northeast	26		2.81			26			3.23			26		15
	North Central	17		1.48			18			1.81			22		23
	Southeast	16		2.4			16			3.42			35		35
	Southwest	12		1.16			12			1.36			4		3
	Total	100	%	1.88	%		100	%		2.39	%		100	%	100	%
	State
	Arizona, California, Florida, and Nevada(4)	26	%	1.91	%		26	%		3.01	%		36	%	47	%
	Illinois, Michigan, and Ohio(5)	10		1.7			11			2.11			17		19
	New York and New Jersey(6)	9		4.62			9			5.11			11		3
	All other	55		1.53			54			1.85			36		31
	Total	100	%	1.88	%		100	%		2.39	%		100	%	100	%
	-1	Within these columns, "—" represents less than 0.5%.
	-2	HARP and other relief refinance loans are presented separately rather than in the year that the refinancing occurred (from 2009 to 2014). All other refinance loans are presented in the year that the refinancing occurred.
	-3	Region designation: West (AK, AZ, CA, GU, HI, ID, MT, NV, OR, UT, WA); Northeast (CT, DE, DC, MA, ME, MD, NH, NJ, NY, PA, RI, VT, VA, WV); North Central (IL, IN, IA, MI, MN, ND, OH, SD, WI); Southeast (AL, FL, GA, KY, MS, NC, PR, SC, TN, VI); Southwest (AR, CO, KS, LA, MO, NE, NM, OK, TX, WY).
	-4	Represents the four states that had the largest cumulative declines in home prices during the housing crisis that began in 2006, as measured using Freddie Mac’s home price index.
	-5	Represents selected states in the North Central region that have experienced adverse economic conditions since 2006.
	-6	Represents two states with a judicial foreclosure process in which there are a significant number of seriously delinquent loans within our single-family credit guarantee portfolio.
	Credit Performance of Certain Higher Risk Single-Family Loan Categories
	Participants in the mortgage market often characterize single-family loans based upon their overall credit quality at the time of origination, generally considering them to be prime or subprime. Many mortgage market participants classify single-family loans with credit characteristics that range between their prime and subprime categories as Alt-A because these loans have a combination of characteristics of each category, may be underwritten with lower or alternative income or asset documentation requirements compared to a full documentation mortgage loan, or both. However, there is no universally accepted definition of subprime or Alt-A. Although we discontinued new purchases of mortgage loans with lower documentation standards for assets or income beginning March 1, 2009, we continued to purchase certain amounts of these mortgages in cases where the loan was either: (a) purchased pursuant to a previously issued other guarantee commitment; (b) part of our relief refinance initiative; or (c) in another refinance mortgage initiative and the pre-existing mortgage (including Alt-A loans) was originated under less than full documentation standards. In the event we purchase a refinance mortgage and the original loan had been previously identified as Alt-A, such refinance loan may no longer be categorized or reported as Alt-A in the table below because the new refinance loan replacing the original loan would not be identified by the seller/servicer as an Alt-A loan. As a result, our reported Alt-A balances may be lower than would otherwise be the case had such refinancing not occurred.
	Although we do not categorize single-family mortgage loans we purchase or guarantee as prime or subprime, we recognize that there are a number of mortgage loan types with certain characteristics that indicate a higher degree of credit risk. For example, a borrower’s credit score is a useful measure for assessing the credit quality of the borrower. Statistically, borrowers with higher credit scores are more likely to repay or have the ability to refinance than those with lower scores.
	Presented below is a summary of the serious delinquency rates of certain higher-risk categories (based on characteristics of the loan at origination) of single-family loans in our single-family credit guarantee portfolio based on UPB. The table includes a presentation of each higher-risk category in isolation. A single loan may fall within more than one category (for example, an interest-only loan may also have an original LTV ratio greater than 90%). Loans with a combination of these attributes will have an even higher risk of delinquency than those with an individual attribute.
	Table 15.2 — Certain Higher-Risk Categories in the Single-Family Credit Guarantee Portfolio(1)
		Percentage of Portfolio(2)					Serious Delinquency Rate
		31-Dec-14		31-Dec-13			31-Dec-14			31-Dec-13
	Interest-only	2	%	2	%		9.36	%		12.51	%
	Option ARM(3)	—		—			9.87			12.3
	Alt-A	3		3			8.53			10.06
	Original LTV ratio greater than 90%(4)	16		16			2.58			3.22
	Lower credit scores at origination (less than 620)	3		3			8.57			9.99
	-1	Excludes loans underlying certain Other Guarantee Transactions for which data was not available.
	-2	Within these columns, "—" represents less than 0.5%.
	-3	For reporting purposes, loans within the option ARM category continue to be reported in that category following modification, even though the modified loan no longer provides for optional payment provisions.
	-4	Includes HARP loans, which we are required to purchase as part of our participation in the MHA Program.
	The percentage of borrowers in our single-family credit guarantee portfolio, based on UPB, with estimated current LTV ratios greater than 100% was 6% and 10% at December 31, 2014 and 2013, respectively. An increase in the estimated current LTV ratio of a loan indicates that the borrower’s equity in the home has declined, and can negatively affect the borrower’s ability to refinance (outside of HARP) or to sell the property for an amount at or above the balance of the outstanding mortgage loan. The serious delinquency rate for single-family loans with estimated current LTV ratios greater than 100% was 9.06% and 9.94% as of December 31, 2014 and 2013, respectively. Loans in our 2005-2008 Legacy single-family book have been more affected by declines in home prices that have occurred since 2006 than loans originated in other years. Our 2005-2008 Legacy single-family book comprised approximately 13% of our single-family credit guarantee portfolio, based on UPB at December 31, 2014, and these loans accounted for approximately 81% of our credit losses during 2014.
	We categorize our investments in non-agency mortgage-related securities as subprime, option ARM, or Alt-A if the securities were identified as such based on information provided to us when we entered into these transactions. We have not identified option ARM, CMBS, obligations of states and political subdivisions, and manufactured housing securities as either subprime or Alt-A securities. See “NOTE 7: INVESTMENTS IN SECURITIES” for further information on these categories and other concentrations in our investments in securities.
	Multifamily Mortgage Portfolio
	The table below summarizes the concentration of multifamily mortgages in our multifamily mortgage portfolio by certain attributes based on UPB. Information presented for multifamily mortgage loans includes certain categories based on loan or borrower characteristics present at origination. The table includes a presentation of each category in isolation. A single loan may fall within more than one category (for example, a loan with an original LTV ratio greater than 80% may also have an original DSCR below 1.10).
	Table 15.3 — Concentration of Credit Risk — Multifamily Mortgage Portfolio
		31-Dec-14						31-Dec-13
		UPB			Delinquency			UPB				Delinquency
					Rate(1)							Rate(1)
		(dollars in billions)
State(2)
California	$	23.2		—	%		$	22.4			0.03	%
Texas	18.3			0.06			16.7				0.02
New York	12.1			—			11.4				0.12
Florida	10			—			9.3				0.28
Virginia	7.3			—			7				0.37
Maryland	7.2			—			6.7				—
All other states	65.2			0.07			59.3				0.08
Total	$	143.3		0.04	%		$	132.8			0.09	%
Region(3)
Northeast	$	39		—	%		$	37.5			0.1	%
West	36.3			—			33.8				0.07
Southwest	29.1			0.07			26.2				0.05
Southeast	26.7			0.09			24.1				0.16
North Central	12.2			0.06			11.2				0.07
Total	$	143.3		0.04	%		$	132.8			0.09	%
Other Categories(4)
Original LTV ratio greater than 80%	$	6.1		0.04	%		$	5.6			0.19	%
Original DSCR below 1.10	2.1			—			2.2				—
-1	Based on mortgages two monthly payments or more delinquent or in foreclosure.
-2	States presented have the highest aggregate UPB at December 31, 2014.
-3	See endnote (3) to “Table 15.1 — Concentration of Credit Risk — Single-Family Credit Guarantee Portfolio” for a description of these regions.
-4	These categories are not mutually exclusive and a loan in one category may also be included within another category.
The amount of a borrower’s equity in the underlying property is one indicator of risk for mortgage loans in our multifamily mortgage portfolio. A borrower’s equity in a property decreases as the LTV ratio increases. Higher LTV ratios negatively affect a borrower’s ability to refinance or sell a property for an amount at or above the balance of the outstanding mortgage. The DSCR is another indicator of future credit performance. The DSCR estimates a multifamily borrower’s ability to service its mortgage obligation using the secured property’s cash flow, after deducting non-mortgage expenses from income. The higher the DSCR, the more likely it is that a multifamily borrower will be able to continue servicing its mortgage obligation.
We estimate that the percentage of loans in our multifamily mortgage portfolio with a current LTV ratio greater than 100% was approximately 1% and 2% at December 31, 2014 and 2013, respectively, and our estimate of the current average DSCR for these loans was 1.05 and 0.95, respectively. We estimate that the percentage of loans in our multifamily mortgage portfolio with a current DSCR less than 1.0 was 2% and 3% at December 31, 2014 and 2013, respectively, and the average current LTV ratio of these loans was 91% and 95%, respectively. Our estimates of current DSCRs are based on the latest reported net operating income for these properties. Our estimates of the current LTV ratios are based on either values we receive from a third-party service provider or our internal estimates of property value, for which we may use changes in tax assessments, market vacancy rates, rent growth and comparable property sales in local areas as well as third-party appraisals for a portion of the portfolio. We periodically perform our own valuations or obtain third-party appraisals in cases where a significant deterioration in a borrower’s financial condition has occurred, the borrower has applied for refinancing, or in certain other circumstances where we deem it appropriate to reassess the property value. Although we use the latest reported financial results of our multifamily borrowers to estimate a property’s value, there may be a significant lag in reporting, which could be six months or more, as they complete their financial results in the normal course of business. Our internal estimates of property valuation are derived using techniques that include income capitalization, discounted cash flows, comparable sales, or replacement costs.
Seller/Servicers
We acquire a significant portion of our single-family mortgage purchase volume from several large sellers and we are exposed to the risk that we could lose purchase volume to the extent certain arrangements with these sellers are terminated. Our top 10 single-family sellers provided approximately 50% of our single-family purchase volume during 2014. Wells Fargo Bank, N.A. accounted for 13% of our single-family mortgage purchase volume and was the only single-family seller that comprised 10% or more of our purchase volume during 2014.
We are exposed to institutional credit risk arising from the potential insolvency or non-performance by our sellers and servicers of their obligations to repurchase mortgages or (at our option) indemnify us in the event of: (a) breaches of the representations and warranties they made when they sold the mortgages to us; or (b) failure to comply with our servicing requirements. Our contracts require that a seller/servicer repurchase a mortgage after we issue a repurchase request, unless the seller/servicer avails itself of an appeals process provided for in our contracts, in which case the deadline for repurchase is extended until we decide on the appeal. As of December 31, 2014 and 2013, the UPB of loans subject to our repurchase requests (seller and servicer related) issued to our single-family sellers and servicers was approximately $0.7 billion and $2.2 billion, respectively (these figures include repurchase requests for which appeals were pending). During 2014 and 2013 we recovered amounts that covered losses with respect to $2.0 billion and $5.6 billion, respectively, in UPB of loans subject to our repurchase requests.
During 2014, we entered into settlement agreements with certain counterparties to release specified loans from certain seller repurchase obligations in exchange for one-time cash payments, which totaled approximately $0.4 billion in aggregate. These agreements related to loans with $27.6 billion in aggregate principal amount (as of the dates of the respective agreements) and we recognized a benefit for credit losses of $0.3 billion included within our consolidated statement of comprehensive income during 2014 related to these agreements.
As of December 31, 2014, single-family loans with aggregate UPB of approximately $315.1 billion (representing 19% of our single-family credit guarantee portfolio) had been released from repurchase obligations primarily because either: (a) the mortgages are subject to negotiated agreements; or (b) the seller/servicers were no longer in business and their obligations have been discharged or a settlement amount was determined in bankruptcy or receivership proceedings.
At the direction of FHFA, Freddie Mac and Fannie Mae have revised their representation and warranty framework for conventional loans purchased by the GSEs on or after January 1, 2013. The objective of the revised framework is to clarify lenders’ repurchase exposures and liability on future sales of mortgage loans to Freddie Mac and Fannie Mae. This framework does not affect seller/servicers’ obligations under their contracts with us with respect to loans sold to us prior to January 1, 2013. This framework also does not affect their obligation to service these loans in accordance with our servicing standards. Under this framework, sellers are relieved of certain repurchase obligations for loans that meet specific payment requirements. This includes, subject to certain exclusions, loans with 36 months (12 months for relief refinance mortgages) of consecutive, on-time payments after we purchase them. In May 2014, we announced changes to our representation and warranty framework for loans acquired on and after July 1, 2014. These changes relieve sellers of additional representations and warranties for these loans and provide relief for loans we have fully reviewed in our quality control process and determined to be acceptable. As of December 31, 2014, approximately 36% in UPB of loans in our single-family credit guarantee portfolio were purchased since January 1, 2013 and are subject to our revised representation and warranty framework.
The ultimate amounts of recovery payments we receive from seller/servicers related to their repurchase obligations may be significantly less than the amount of our estimates of potential exposure to losses. Our estimate of probable incurred losses for exposure to seller/servicers for their repurchase obligations is considered in our allowance for loan losses. See “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES — Allowance for Loan Losses and Reserve for Guarantee Losses” for further information.
We are also exposed to the risk that servicers might fail to service mortgages in accordance with our contractual requirements, resulting in increased credit losses. For example, our servicers have an active role in our loss mitigation efforts, including under the servicing alignment initiative and the MHA Program, and therefore, we have exposure to them to the extent a decline in their performance results in a failure to realize the anticipated benefits of our loss mitigation plans. Since we do not have our own servicing operation, if our servicers lack appropriate controls, experience a failure in their controls, or experience an operating disruption in their ability to service mortgage loans, our business and financial results could be adversely affected.
A significant portion of our single-family mortgage loans are serviced by several large servicers. Our top two single-family loan servicers, Wells Fargo Bank, N.A. and JPMorgan Chase Bank, N.A., serviced approximately 22% and 12%, respectively, of our single-family mortgage loans, and were the only servicers that serviced more than 10% of our loans, as of December 31, 2014. In recent years, there has been a shift in our servicing from depository institutions to non-depository specialty servicers that specialize in workouts of problem loans. Some of these non-depository specialty servicers have grown rapidly in recent years and now service a large share of our loans. As of both December 31, 2014 and 2013, approximately 10% of our total single-family credit guarantee portfolio was serviced by our three largest non-depository specialty servicers (including subsidiaries and/or affiliates of Ocwen Financial Corp., or Ocwen) , on a combined basis. Several of these non-depository specialty servicers also service a large share of the loans underlying our investments in non-agency mortgage-related securities. As of December 31, 2014, approximately 43% of our investments in single-family non-agency mortgage-related securities, based on UPB, were serviced by Ocwen, and it was the only non-depository specialty servicer who serviced 10% or more of the UPB underlying our investments in non-agency mortgage-related securities at that date.
Ocwen and its subsidiaries and/or affiliates have recently been the subject of significant adverse regulatory scrutiny, including in New York and California, and Ocwen’s credit rating and servicer rating have been downgraded. In December 2014, the New York State Department of Financial Services (NYDFS) entered into a consent order with Ocwen that provided for, among other items, changes in Ocwen’s board of directors. Ocwen is not permitted to acquire additional mortgage servicing rights until it receives prior approval from the NYDFS, and meets certain conditions set forth in the consent agreement. In January 2015, the California Department of Business Oversight (CDBO) announced that it had entered into a settlement with Ocwen Loan Servicing, LLC related to the company’s failure to provide certain loan information to the regulator. Among other items, the settlement prohibits Ocwen Loan Servicing, LLC from acquiring any additional mortgage servicing rights for loans secured by properties in California until the CDBO determines the firm can fully respond in a timely manner to future requests for information.
As of December 31, 2014, approximately 14% of our investments in single-family non-agency mortgage-related securities, based on UPB, were serviced by JPMorgan Chase Bank, N.A.
We acquire our multifamily mortgage loans from a network of approved sellers. Our top two multifamily sellers, CBRE Capital Markets, Inc. and Berkadia Commercial Mortgage LLC, accounted for 20% and 15%, respectively, of our multifamily new business volume for 2014. Our top ten multifamily sellers represented an aggregate of approximately 84% of our multifamily new business volume for 2014.
A significant portion of our multifamily mortgage loans are serviced by several of our large customers. As of December 31, 2014 our top three multifamily servicers, Wells Fargo Bank, N.A., Berkadia Commercial Mortgage LLC, and CBRE Capital Markets, Inc., each serviced more than 10% of our multifamily mortgage portfolio, excluding K Certificates, and together serviced approximately 39% of this portfolio.
In our multifamily business, we are exposed to the risk that multifamily seller/servicers could come under financial pressure, which could potentially cause degradation in the quality of the servicing they provide us, including their monitoring of each property’s financial performance and physical condition. This could also, in certain cases, reduce the likelihood that we could recover losses through lender repurchases, recourse agreements, or other credit enhancements, where applicable. This risk primarily relates to multifamily loans that we hold on our consolidated balance sheets where we retain all of the related credit risk. We monitor the status of all our multifamily seller/servicers in accordance with our counterparty credit risk management framework.
Mortgage Insurers
We have institutional credit risk relating to the potential insolvency of, or non-performance by, mortgage insurers that insure single-family mortgages we purchase or guarantee. We evaluate the recovery and collectability from insurance policies for mortgage loans that we hold for investment as well as loans underlying our non-consolidated Freddie Mac mortgage-related securities or covered by other guarantee commitments as part of the estimate of our loan loss reserves. See “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES — Allowance for Loan Losses and Reserve for Guarantee Losses” for additional information. As of December 31, 2014, mortgage insurers provided coverage with maximum loss limits of $58.9 billion, for $230.7 billion of UPB, in connection with our single-family credit guarantee portfolio. These amounts are based on gross coverage without regard to netting of coverage that may exist to the extent an affected mortgage is covered under both primary and pool insurance. Our top four mortgage insurer counterparties, Radian Guaranty Inc., United Guaranty Residential Insurance Company, Mortgage Guaranty Insurance Corporation, and Genworth Mortgage Insurance Corporation each accounted for more than 10% and collectively represented approximately 80% of our overall mortgage insurance coverage at December 31, 2014. Of our four largest counterparties, three are rated BB-, and one is rated BBB+, as of December 31, 2014, based on the lower of the S&P or Moody’s rating scales and stated in terms of the S&P equivalent. PMI Mortgage Insurance Co. (PMI), Republic Mortgage Insurance Co. (RMIC), and Triad Guaranty Insurance Corp. (Triad) are no longer rated by either S&P or Moody’s because they are in rehabilitation or under regulatory supervision.
We received proceeds of $1.1 billion and $2.0 billion during 2014 and 2013, respectively, from our primary and pool mortgage insurance policies for recovery of losses on our single-family loans. We had outstanding receivables from mortgage insurers of $0.4 billion and $0.7 billion (excluding deferred payment obligations associated with unpaid claim amounts) as of December 31, 2014 and 2013, respectively. The balance of these receivables, net of associated reserves, was approximately $0.3 billion and $0.5 billion at December 31, 2014 and 2013, respectively.
PMI and Triad are both in rehabilitation, and a substantial portion of their claims are recorded by us as deferred payment obligations. These insurers no longer issue new insurance but continue to pay a portion of their respective claims in cash. In March 2014, PMI began paying valid claims 67% in cash and 33% in deferred payment obligations and made a one-time cash payment to us for claims that were previously settled for 55% in cash. In December 2013, Triad began paying valid claims 75% in cash and 25% in deferred payment obligations and made a one-time cash payment to us for claims that were previously settled for 60% in cash. If, as we currently expect, these insurers do not pay the full amount of their deferred payment obligations in cash, we would lose a portion of the coverage from these insurers. As of December 31, 2014, we had cumulative unpaid deferred payment obligations of $0.4 billion from these insurers. We reserved for all of these unpaid amounts as collectability is uncertain.
RMIC is under regulatory supervision and is no longer issuing new insurance. In June 2014, RMIC announced that it would: (a) resume paying valid claims at 100% of the claim amount without further deferrals, effective with claims settled on or after July 1, 2014, and (b) pay, in full, all deferred payment obligations outstanding as of June 30, 2014. In July 2014, we received RMIC's payment of all deferred payment obligations owed to us. Previously, RMIC had been paying all valid claims 60% in cash and 40% in deferred payment obligations.
It is not clear how the regulators of these companies will administer their respective deferred payment plans in the future, nor when or if those obligations will be paid.
Bond Insurers
Bond insurance is a credit enhancement covering certain of the non-agency mortgage-related securities we hold. Some policies were acquired by the securitization trust that issued the securities we purchase, while others were acquired by us. At December 31, 2014, the maximum principal exposure to credit losses related to such policies was $6.8 billion. At December 31, 2014, our top four bond insurers, Ambac Assurance Corporation (Ambac), National Public Finance Guarantee Corp., Financial Guaranty Insurance Company (FGIC), and MBIA Insurance Corp., each accounted for more than 10% of our overall bond insurance coverage and collectively represented approximately 92% of our total coverage.
In June 2012, a rehabilitation order was signed granting the Superintendent of Financial Services of the State of New York the authority to take possession and/or control of FGIC’s property and assets and to conduct FGIC’s business. In June 2013, FGIC’s plan of rehabilitation was approved under which permitted claims are paid 17% in cash and the remainder in deferred payment obligations.
In March 2010, Ambac established a segregated account for certain Ambac-insured securities, including some of those held by Freddie Mac. Upon the request of the Wisconsin Office of the Commissioner of Insurance, the Wisconsin circuit court put the segregated account into rehabilitation (i.e., a state insolvency proceeding). The Office of the Commissioner of Insurance subsequently filed a plan of rehabilitation with the court. In the third quarter of 2012, Ambac began making partial cash payments of 25% of the permitted amount of each policy claim. In 2013, Ambac began making supplemental payments, equal to all or a portion of the permitted policy claim, with respect to certain specified securities. In June 2014, an amended plan was approved by the court. The amended plan provided for Ambac to increase the amount of cash payments to 45% of the permitted amount of each policy claim, and Ambac made a one-time cash payment to us for claims that were previously settled for 25% in cash.
We expect to receive substantially less than full payment of our claims from Ambac and FGIC as these companies are either insolvent or in rehabilitation. We believe that we will also likely receive substantially less than full payment of our claims from some of our other bond insurers, because we believe they also lack sufficient ability to fully meet all of their expected lifetime claims-paying obligations to us as such claims emerge. We evaluate the expected recovery from primary bond insurance policies as part of our impairment analysis for our investments in securities. See “NOTE 7: INVESTMENTS IN SECURITIES” for further information on our investments in securities covered by bond insurance.
Cash and Other Investments Counterparties
We are exposed to institutional credit risk arising from the potential insolvency or non-performance of counterparties of non-mortgage-related investment agreements and cash equivalent transactions, including those entered into on behalf of our securitization trusts. Our policies require that the issuer be rated as investment grade at the time the financial instrument is purchased. We base the permitted term and dollar limits for each of these transactions on the counterparty's financial strength in order to further mitigate our risk.
Our cash and other investment counterparties are primarily major institutions, Treasury, and the Federal Reserve Bank of New York. As of December 31, 2014 and 2013, including amounts related to our consolidated VIEs, there were $71.4 billion and $85.9 billion, respectively, of: (a) cash and securities purchased under agreements to resell invested with institutional counterparties; (b) Treasury securities classified as cash equivalents; or (c) cash deposited with the Federal Reserve Bank of New York. As of December 31, 2014 these included:
•	$42.2 billion of securities purchased under agreements to resell with 15 counterparties that had short-term S&P ratings of A-1 or above;
•	$1.2 billion of securities purchased under agreements to resell with three counterparties that had short-term S&P ratings of A-2;
•	$8.6 billion of securities purchased under agreements to resell with four counterparties that do not have short-term S&P or other third-party credit ratings, but were evaluated under the company's counterparty credit risk system and were determined to be eligible for these transactions (by providing more than 100% in approved collateral);
•	$4.4 billion of cash equivalents invested in Treasury securities; and
•	$15.0 billion of cash deposited with the Federal Reserve Bank of New York (as a non-interest-bearing deposit).
Non-Agency Mortgage-Related Security Issuers
We are engaged in various loss mitigation efforts concerning certain investments in non-agency mortgage-related securities, including the activities discussed below. The effectiveness of these various loss mitigation efforts is uncertain, in part because our rights as an investor are limited, and any potential recoveries may take significant time to realize. Lawsuits against a number of parties are currently pending. These parties include some of our significant seller/servicers and counterparties, including counterparties to debt funding and derivatives transactions.
In 2011, FHFA, as Conservator for Freddie Mac and Fannie Mae, filed lawsuits against 18 corporate families of financial institutions and related defendants alleging securities laws violations and, in some cases, fraud. These lawsuits sought to recover losses and damages sustained by Freddie Mac and Fannie Mae as a result of their investments in certain non-agency mortgage-related securities issued or sold by, or backed by mortgages originated by, these financial institutions or control persons thereof. As of December 31, 2014, most of these lawsuits have been resolved through settlements. We and FHFA reached settlements with the following parties in these FHFA-filed lawsuits in 2014:
•	Morgan Stanley (February 2014)
•	Societe Generale (February 2014)
•	Credit Suisse Holdings (USA), Inc. (March 2014)
•	Bank of America Corporation (March 2014)
•	Barclays Bank PLC (April 2014)
•	First Horizon National Corporation (April 2014)
•	RBS Securities, Inc. (June 2014; resolved claims against RBS in FHFA's lawsuit against Ally Financial Inc.)
•	Goldman Sachs and Co. (August 2014)
•	HSBC North America Holdings, Inc. (September 2014)
At the direction of our Conservator, we are also working to enforce contractual rights of certain trusts with respect to the non-agency mortgage-related securities we hold, and have directed certain trustees to initiate litigation on behalf of certificate holders against several financial institutions for breach of contract claims. We reached a settlement with WMC Mortgage LLC in March 2014.
During 2014, we recognized $6.1 billion within non-interest income on our consolidated statements of comprehensive income from the settlements discussed above.
We have also been participating with other investors in non-agency mortgage-related securities in certain investor consortiums that seek to enforce certain claims relating to such securities. As discussed below, three settlements have been announced. Each of these settlements resolves certain claims with respect to a number of mortgage securitization trusts, including trusts in which we have investments. If an individual settlement is approved, we would expect to receive a benefit from the settlement for those covered securitizations that we hold at the time settlement proceeds are distributed to the trusts. Each settlement is subject to various conditions, and it is not possible to predict the timing or ultimate outcome of the approval process for any individual settlement, which could take substantial time. The settlements are as follows:
•	In April 2014, Citigroup Inc. announced a settlement to resolve certain claims with respect to a number of mortgage securitization trusts. In December 2014, the trustees of the securitizations filed suit in New York state court seeking approval of the settlement.
•	In November 2013, J.P. Morgan Chase & Co. announced a settlement to resolve certain claims with respect to a number of mortgage securitization trusts. In October 2014, the trustees of the securitizations filed suit in New York state court seeking approval of the settlement.
•	In June 2011, Bank of America Corporation, BAC Home Loans Servicing, LP, Countrywide Financial Corporation and Countrywide Home Loans, Inc. entered into a settlement agreement with The Bank of New York Mellon, as trustee, to resolve certain claims with respect to a number of Countrywide mortgage securitization trusts. In January 2014, a New York state court approved a significant portion of the settlement. An appeal of this decision is pending. There can be no assurance that final court approval of the entire settlement will be obtained.
See "Seller/Servicers" for information about specialty servicers that service mortgage loans underlying our non-agency mortgage-related securities.
Derivative Portfolio
Our use of cleared derivatives, exchange-traded derivatives, and OTC derivatives exposes us to institutional credit risk. The requirement that we post initial and variation margin in connection with exchange-traded derivatives and cleared derivatives exposes us to institutional credit risk in the event that our clearing members or the clearinghouses fail to meet their obligations. However, the use of exchange-traded derivatives and cleared derivatives mitigates our institutional credit risk exposure to individual counterparties because a central counterparty is substituted for individual counterparties, and changes in the value of open exchange-traded contracts and cleared derivatives are settled or collateralized daily via payments made through the clearinghouse. OTC derivatives, however, expose us to institutional credit risk to individual counterparties because transactions are executed and settled between us and each counterparty, exposing us to potential losses if a counterparty fails to meet its contractual obligations.
For a discussion of our derivative counterparties as well as related master netting and collateral agreements, see “NOTE 10: COLLATERAL AND OFFSETTING OF ASSETS AND LIABILITIES.”

Fair_Value_Disclosures

Fair Value Disclosures	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
FAIR VALUE DISCLOSURES	NOTE 16: FAIR VALUE DISCLOSURES
	The accounting guidance for fair value measurements and disclosures defines fair value, establishes a framework for measuring fair value, and sets forth disclosure requirements regarding fair value measurements. This guidance applies whenever other accounting guidance requires or permits assets or liabilities to be measured at fair value. Fair value measurement assumes that the transaction to sell the asset or transfer the liability takes place either in the principal market for the asset or liability, or, in the absence of a principal market, in the most advantageous market for the asset or liability.
	We use fair value measurements for the initial recording of certain assets and liabilities and periodic remeasurement of certain assets and liabilities on a recurring or non-recurring basis.
	Fair Value Measurements
	The accounting guidance for fair value measurements and disclosures establishes a three-level fair value hierarchy that prioritizes the inputs into the valuation techniques used to measure fair value. The fair value hierarchy gives the highest priority, Level 1, to measurements based on quoted prices in active markets for identical assets or liabilities. The next highest priority, Level 2, is given to measurements based on observable inputs other than quoted prices in active markets for identical assets or liabilities. The lowest priority, Level 3, is given to measurements based on unobservable inputs. Assets and liabilities are classified in their entirety within the fair value hierarchy based on the lowest level input that is significant to the fair value measurement.
	Assets and Liabilities on Our Consolidated Balance Sheets Measured at Fair Value on a Recurring Basis
	The table below presents our assets and liabilities measured on our consolidated balance sheets at fair value on a recurring basis subsequent to initial recognition, including instruments where we have elected the fair value option, as of December 31, 2014 and 2013.
	Table 16.1 — Assets and Liabilities on Our Consolidated Balance Sheets Measured at Fair Value on a Recurring Basis
		December 31, 2014
		Level 1			Level 2			Level 3			Netting				Total
											Adjustment(1)
		(in millions)
	Assets:
	Investments in securities:
	Available-for-sale, at fair value:
	Mortgage-related securities:
	Freddie Mac	$	—		$	34,868		$	4,231		$	—			$	39,099
	Fannie Mae	—			11,228			85			—				11,313
	Ginnie Mae	—			195			4			—				199
	CMBS	—			18,348			3,474			—				21,822
	Subprime	—			—			20,589			—				20,589
	Option ARM	—			—			5,649			—				5,649
	Alt-A and other	—			16			5,027			—				5,043
	Obligations of states and political subdivisions	—			—			2,198			—				2,198
	Manufactured housing	—			—			638			—				638
	Total available-for-sale securities, at fair value	—			64,655			41,895			—				106,550
	Trading, at fair value:
	Mortgage-related securities:
	Freddie Mac	—			16,542			927			—				17,469
	Fannie Mae	—			5,867			232			—				6,099
	Ginnie Mae	—			15			1			—				16
	Other	—			167			4			—				171
	Total mortgage-related securities	—			22,591			1,164			—				23,755
	U.S. Treasury securities	6,682			—			—			—				6,682
	Total trading securities, at fair value	6,682			22,591			1,164			—				30,437
	Total investments in securities	6,682			87,246			43,059			—				136,987
	Mortgage loans:
	Held-for-sale, at fair value	—			12,130			—			—				12,130
	Derivative assets, net:
	Interest-rate swaps	—			5,653			—			—				5,653
	Option-based derivatives	5			4,219			—			—				4,224
	Other	—			40			27			—				67
	Subtotal, before netting adjustments	5			9,912			27			—				9,944
	Netting adjustments(1)	—			—			—			(9,122		)		(9,122		)
	Total derivative assets, net	5			9,912			27			(9,122		)		822
	Other assets:
	Guarantee asset, at fair value	—			—			1,626			—				1,626
	All other, at fair value	—			—			5			—				5
	Total other assets	—			—			1,631			—				1,631
	Total assets carried at fair value on a recurring basis	$	6,687		$	109,288		$	44,717		$	(9,122	)		$	151,570
	Liabilities:
	Debt securities of consolidated trusts held by third parties, at fair value	$	—		$	42		$	—		$	—			$	42
	Other debt, at fair value	—			5,820			—			—				5,820
	Derivative liabilities, net:
	Interest-rate swaps	—			13,316			—			—				13,316
	Option-based derivatives	28			99			—			—				127
	Other	—			80			37			—				117
	Subtotal, before netting adjustments	28			13,495			37			—				13,560
	Netting adjustments(1)	—			—			—			(11,597		)		(11,597		)
	Total derivative liabilities, net	28			13,495			37			(11,597		)		1,963
	Total liabilities carried at fair value on a recurring basis	$	28		$	19,357		$	37		$	(11,597	)		$	7,825
		Fair Value at December 31, 2013
		Level 1			Level 2			Level 3			Netting				Total
											Adjustment(1)
	(in millions)
Assets:
Investments in securities:
Available-for-sale, at fair value:
Mortgage-related securities:
Freddie Mac	$	—		$	38,720		$	1,939		$	—			$	40,659
Fannie Mae	—			10,666			131			—				10,797
Ginnie Mae	—			155			12			—				167
CMBS	—			27,229			3,109			—				30,338
Subprime	—			—			27,499			—				27,499
Option ARM	—			—			6,574			—				6,574
Alt-A and other	—			—			8,706			—				8,706
Obligations of states and political subdivisions	—			—			3,495			—				3,495
Manufactured housing	—			—			684			—				684
Total available-for-sale securities, at fair value	—			76,770			52,149			—				128,919
Trading, at fair value:
Mortgage-related securities:
Freddie Mac	—			9,006			343			—				9,349
Fannie Mae	—			6,959			221			—				7,180
Ginnie Mae	—			24			74			—				98
Other	—			133			8			—				141
Total mortgage-related securities	—			16,122			646			—				16,768
U.S. Treasury securities	6,636			—			—			—				6,636
Total trading securities, at fair value	6,636			16,122			646			—				23,404
Total investments in securities	6,636			92,892			52,795			—				152,323
Mortgage loans:
Held-for-sale, at fair value	—			8,727			—			—				8,727
Derivative assets, net:
Interest-rate swaps	—			10,009			10			—				10,019
Option-based derivatives	—			4,112			—			—				4,112
Other	—			99			1			—				100
Subtotal, before netting adjustments	—			14,220			11			—				14,231
Netting adjustments(1)	—			—			—			(13,168		)		(13,168		)
Total derivative assets, net	—			14,220			11			(13,168		)		1,063
Other assets:
Guarantee asset, at fair value	—			—			1,611			—				1,611
All other, at fair value	—			—			9			—				9
Total other assets	—			—			1,620			—				1,620
Total assets carried at fair value on a recurring basis	$	6,636		$	115,839		$	54,426		$	(13,168	)		$	163,733
Liabilities:
Debt securities of consolidated trusts held by third parties, at fair value	$	—		$	59		$	—		$	—			$	59
Other debt, at fair value	—			1,155			1,528			—				2,683
Derivative liabilities, net:
Interest-rate swaps	—			13,022			295			—				13,317
Option-based derivatives	—			201			3			—				204
Other	—			68			38			—				106
Subtotal, before netting adjustments	—			13,291			336			—				13,627
Netting adjustments(1)	—			—			—			(13,447		)		(13,447		)
Total derivative liabilities, net	—			13,291			336			(13,447		)		180
Total liabilities carried at fair value on a recurring basis	$	—		$	14,505		$	1,864		$	(13,447	)		$	2,922
-1	Represents counterparty netting, cash collateral netting and net derivative interest receivable or payable. The net cash collateral posted was $3.2 billion and $871 million, respectively, at December 31, 2014 and 2013. The net interest receivable (payable) of derivative assets and derivative liabilities was $(0.7) billion and $(0.6) billion at December 31, 2014 and 2013, respectively, which was mainly related to interest rate swaps.
Changes in Fair Value Levels
We monitor the availability of observable market data to: (a) assess the appropriate classification of financial instruments within the fair value hierarchy; and (b) transfer assets and liabilities between Level 1, Level 2, and Level 3 accordingly. Observable market data includes, but is not limited to, quoted prices and market transactions. Changes in economic conditions or the volume and level of activity in a market generally will drive changes in availability of observable market data. Changes in availability of observable market data, which also may result in changing the valuation technique used, are generally the cause of transfers between Level 1, 2, or 3.
For the year ended December 31, 2014, our transfers between Level 1 and Level 2 assets and liabilities were less than $1 million. For the year ended December 31, 2013, our transfers between Level 1 and Level 2 were $27 million for assets and $5 million for liabilities.
The table below presents a reconciliation of all assets and liabilities measured on our consolidated balance sheets at fair value on a recurring basis using significant unobservable inputs (Level 3) for the years ended December 31, 2014 and 2013, including transfers into and out of Level 3 assets and liabilities. The table also presents gains and losses due to changes in fair value, including both realized and unrealized gains and losses, recognized in our consolidated statements of comprehensive income for Level 3 assets and liabilities for the years ended December 31, 2014 and 2013. When assets and liabilities are transferred between levels, we recognize the transfer as of the beginning of the period.
Table 16.2 — Assets and Liabilities on Our Consolidated Balance Sheets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs
	Year Ended December 31, 2014
				Realized and unrealized gains (losses)
	Balance,			Included in			Included in			Total				Purchases			Issues		Sales			Settlements,			Transfers		Transfers			Balance,		Unrealized
	January 1,			earnings(1)			other															net			into		out of			December 31,		gains (losses)
	2014						comprehensive																		Level 3(2)		Level 3(2)			2014		still held
							income(1)
	in millions
Assets
Investments in securities:
Available-for-sale, at fair value:
Mortgage-related securities:
Freddie Mac	$	1,939		$	2		$	71		$	73			$	5,742		$	—	$	(3,346	)	$	(138	)	$	3	$	(42	)	$	4,231	$	—
Fannie Mae	131			—			(2		)	(2		)		48			—		(59		)	(29		)	45		(49		)	85		—
Ginnie Mae	12			—			—			—				—			—		(6		)	(3		)	1		—			4		—
CMBS	3,109			—			397			397				—			—		(1		)	(31		)	—		—			3,474		—
Subprime	27,499			(524		)	2,778			2,254				—			—		(7,469		)	(1,695		)	—		—			20,589		(794		)
Option ARM	6,574			(71		)	232			161				—			—		(791		)	(295		)	—		—			5,649		(102		)
Alt-A and other	8,706			111			158			269				—			—		(3,659		)	(272		)	—		(17		)	5,027		(42		)
Obligations of states and political subdivisions	3,495			1			71			72				1			—		(13		)	(1,357		)	—		—			2,198		—
Manufactured housing	684			—			28			28				—			—		—			(74		)	—		—			638		—
Total available-for-sale mortgage-related securities	52,149			(481		)	3,733			3,252				5,791			—		(15,344		)	(3,894		)	49		(108		)	41,895		(938		)
Trading, at fair value:
Mortgage-related securities:
Freddie Mac	343			8			—			8				2,282			95		(1,690		)	(43		)	—		(68		)	927		11
Fannie Mae	221			(45		)	—			(45		)		79			—		—			(14		)	21		(30		)	232		(45		)
Ginnie Mae	74			—			—			—				1			—		(70		)	(4		)	—		—			1		(2		)
Other	8			(1		)	—			(1		)		—			—		—			(3		)	—		—			4		(1		)
Total trading mortgage-related securities	646			(38		)	—			(38		)		2,362			95		(1,760		)	(64		)	21		(98		)	1,164		(37		)
Other assets:
Guarantee asset(3)	1,611			(184		)	—			(184		)		—			427		—			(228		)	—		—			1,626		(263		)
All other, at fair value	9			(4		)	—			(4		)		—			—		—			—			—		—			5		(4		)
Total other assets	1,620			(188		)	—			(188		)		—			427		—			(228		)	—		—			1,631		(267		)
				Realized and unrealized (gains) losses
	Balance,			Included in			Included in			Total				Purchases			Issues		Sales			Settlements,			Transfers		Transfers			Balance,		Unrealized
	January 1,			earnings(1)			other															net			into		out of			December 31,		(gains)
	2014						comprehensive																		Level 3(2)		Level 3(2)			2014		losses
							income(1)																									still held
	(in millions)
Liabilities
Other debt, at fair value	$	1,528		$	(7	)	$	—		$	(7	)		$	—		$	—	$	—		$	(1,521	)	$	—	$	—		$	—	$	—
Net derivatives(4)	325			(94		)	—			(94		)		—			—		—			60			—		(281		)	10		(30		)
	Year Ended December 31, 2013
				Realized and unrealized gains (losses)
	Balance,			Included in			Included in			Total				Purchases			Issues		Sales			Settlements,			Transfers		Transfers			Balance,		Unrealized
	January 1,			earnings(1)			other															net			into		out of			December 31,		gains (losses)
	2013						comprehensive																		Level 3		Level 3			2013		still held
							income(1)
	(in millions)
Assets
Investments in securities:
Available-for-sale, at fair value:
Mortgage-related securities:
Freddie Mac	$	1,802		$	2		$	109		$	111			$	239		$	—	$	(86	)	$	(152	)	$	25	$	—		$	1,939	$	—
Fannie Mae	163			—			(3		)	(3		)		—			—		—			(29		)	—		—			131		—
Ginnie Mae	16			—			—			—				—			—		—			(4		)	—		—			12		—
CMBS	3,429			6			(266		)	(260		)		—			—		(36		)	(24		)	—		—			3,109		—
Subprime	26,457			(1,260		)	6,648			5,388				—			—		(403		)	(3,943		)	—		—			27,499		(1,258		)
Option ARM	5,717			(61		)	1,694			1,633				—			—		(75		)	(701		)	—		—			6,574		(58		)
Alt-A and other	10,904			(128		)	1,341			1,213				—			—		(2,001		)	(1,410		)	—		—			8,706		(179		)
Obligations of states and political subdivisions	5,798			13			(188		)	(175		)		(10		)	—		(533		)	(1,585		)	—		—			3,495		—
Manufactured housing	709			(1		)	62			61				—			—		—			(86		)	—		—			684		(1		)
Total available-for-sale mortgage-related securities	54,995			(1,429		)	9,397			7,968				229			—		(3,134		)	(7,934		)	25		—			52,149		(1,496		)
Trading, at fair value:
Mortgage-related securities:
Freddie Mac	1,165			(50		)	—			(50		)		1,271			269		(1,476		)	(64		)	1		(773		)	343		(53		)
Fannie Mae	312			(42		)	—			(42		)		2			—		(2		)	(25		)	43		(67		)	221		(42		)
Ginnie Mae	92			(1		)	—			(1		)		3			—		—			(15		)	—		(5		)	74		(1		)
Other	21			—			—			—				—			—		—			(3		)	—		(10		)	8		—
Total trading mortgage-related securities	1,590			(93		)	—			(93		)		1,276			269		(1,478		)	(107		)	44		(855		)	646		(96		)
Mortgage Loans
Held-for-sale, at fair value(5)	14,238			—			—			—				—			—		—			—			—		(14,238		)	—		—
Other assets:
Guarantee asset(3)	1,029			4			—			4				—			688		—			(110		)	—		—			1,611		4
All other, at fair value	114			30			—			30				—			—		(135		)	—			—		—			9		7
Total other assets	1,143			34			—			34				—			688		(135		)	(110		)	—		—			1,620		11
				Realized and unrealized (gains) losses
	Balance,			Included in			Included in			Total				Purchases			Issues		Sales			Settlements,			Transfers		Transfers			Balance,		Unrealized
	January 1,			earnings(1)			other															net			into		out of			December 31,		(gains)
	2013						comprehensive																		Level 3		Level 3			2013		losses
							income(1)																									still held
	(in millions)
Liabilities
Other debt, at fair value	$	2,187		$	11		$	—		$	11			$	—		$	1,130	$	—		$	(670	)	$	—	$	(1,130	)	$	1,528	$	4
Net derivatives(4)	47			301			—			301				—			12		—			(35		)	—		—			$	325	274
-1	Changes in fair value for available-for-sale securities are recorded in AOCI, while gains and losses from sales are recorded in other gains (losses) on investment securities recognized in earnings on our consolidated statements of comprehensive income. For mortgage-related securities classified as trading, the realized and unrealized gains (losses) are recorded in other gains (losses) on investment securities recognized in earnings on our consolidated statements of comprehensive income.
-2	Transfers out of Level 3 during the year ended December 31, 2014 consist primarily of certain mortgage-related securities and certain derivatives due to an increased volume and level of activity in the market and availability of price quotes from dealers and third-party pricing services. Transfers into Level 3 during the year ended December 31, 2014 consist primarily of certain mortgage-related securities due to a lack of market activity and relevant price quotes from dealers and third-party pricing services.
-3	Changes in fair value of the guarantee asset are recorded in other income on our consolidated statements of comprehensive income.
-4	Amounts are prior to counterparty netting, cash collateral netting, net trade/settle receivable or payable and net derivative interest receivable or payable.
-5	For held-for-sale mortgage loans with the fair value option elected, gains (losses) on fair value changes and from sales of mortgage loans are recorded in other income on our consolidated statements of comprehensive income.
Assets on Our Consolidated Balance Sheets Measured at Fair Value on a Non-Recurring Basis
We may be required, from time to time, to measure certain assets at fair value on a non-recurring basis after our initial recognition. These adjustments usually result from the application of lower-of-cost-or-fair-value accounting or measurement of impairment based on the fair value of the underlying collateral. These assets include impaired held-for-investment single-family and multifamily mortgage loans and REO, net.
The table below presents assets measured on our consolidated balance sheets at fair value on a non-recurring basis at December 31, 2014 and 2013, respectively.
Table 16.3 — Assets on Our Consolidated Balance Sheets Measured at Fair Value on a Non-Recurring Basis
	December 31,
	2014													2013
	Level 1			Level 2			Level 3			Total				Level 1			Level 2		Level 3			Total
	(in millions)
Assets measured at fair value on a non-recurring basis:
Mortgage loans(1)	$	—		$	80		$	8,962		$	9,042			$	—		$	—	$	515		$	515
REO, net(2)	—			—			1,665			1,665				—			—		1,837			1,837
Total assets measured at fair value on a non-recurring basis	$	—		$	80		$	10,627		$	10,707			$	—		$	—	$	2,352		$	2,352
-1	Includes impaired single-family and multifamily mortgage loans that are classified as held-for-investment and have a related valuation allowance based on the fair value of the underlying collateral and held-for-sale multifamily mortgage loans where the fair value is below cost.
-2	Represents the fair value of foreclosed properties that were measured at fair value subsequent to their initial classification as REO, net. The carrying amount of REO, net was written down to fair value of $1.7 billion, less estimated costs to sell of $109 million (or approximately $1.6 billion) at December 31, 2014. The carrying amount of REO, net was written down to fair value of $1.8 billion, less estimated costs to sell of $118 million (or approximately $1.7 billion) at December 31, 2013.
Valuation Processes and Controls Over Fair Value Measurement
We designed our control processes so that our fair value measurements are appropriate and reliable, that they are based on observable inputs where possible, and that our valuation approaches are consistently applied and the assumptions and inputs are reasonable. Our control processes provide a framework for segregation of duties and oversight of our fair value methodologies, techniques, validation procedures, and results.
Groups within our Finance division, independent of our business functions, execute and validate the valuation processes and are responsible for determining the fair values of the majority of our financial assets and liabilities. In determining fair value, we consider the credit risk of our counterparties in estimating the fair values of our assets and our own credit risk in estimating the fair values of our liabilities. The fair values determined by our Finance division are further verified by an independent group within our Enterprise Risk Management (ERM) division.
The validation procedures performed by ERM are intended to ensure that the prices we receive from third parties are consistent with our observations of market activity, and that fair value measurements developed using internal data reflect the assumptions that a market participant would use in pricing our assets and liabilities. These validation procedures include performing a monthly independent verification of fair value measurements through independent modeling, analytics, and comparisons to other market source data, if available. Where applicable, prices are back-tested by comparing actual settlement prices to our fair value measurements. Analytical procedures include automated checks consisting of prior-period variance analysis, comparisons of actual prices to internally calculated expected prices based on observable market changes, analysis of changes in pricing ranges, relative value comparisons, and comparisons using modeled yields. Thresholds are set for each product category by ERM to identify exceptions that require further analysis. If a price is outside of our established thresholds, we perform additional validation procedures, including supplemental analytics and/or follow up discussions with the third-party provider. If we are unable to validate the reasonableness of a given price, we ultimately do not use that price for fair value measurements in our consolidated financial statements. These reviews are risk-based, cover all product categories, and are executed before we finalize the prices used in preparing our fair value measurements for our financial statements.
In addition to performing the validation procedures noted above, ERM provides independent risk governance over all valuation processes by establishing and maintaining a corporate-wide valuation framework and control policy. ERM also independently reviews key judgments, methodologies, and valuation techniques to ensure compliance with established policies.
Our Valuation & Finance Model Committee (“Valuation Committee”), which includes representation from our business areas, ERM, and Finance divisions, provides senior management’s governance over valuation processes, methodologies, controls and fair value measurements. Identified exceptions are reviewed and resolved through the verification process and reviewed at the Valuation Committee.
Where models are employed to assist in the measurement and verification of fair values, changes made to those models during the period are reviewed and approved according to the corporate model change governance process, with all material changes reviewed at the Valuation Committee. Inputs used by models are regularly updated for changes in the underlying data, assumptions, valuation inputs, and market conditions, and are subject to the valuation controls noted above.
Use of Third-Party Pricing Data in Fair Value Measurement
As discussed in the sections that follow, many of our valuation techniques use, either directly or indirectly, data provided by third-party pricing services or dealers. The techniques used by these pricing services and dealers to develop the prices generally are either: (a) a comparison to transactions involving instruments with similar collateral and risk profiles, adjusted as necessary based on specific characteristics of the asset or liability being valued; or (b) industry-standard modeling, such as a discounted cash flow model. The prices provided by the pricing services and dealers reflect their observations and assumptions related to market activity, including risk premiums and liquidity adjustments. The models and related assumptions used by the pricing services and dealers are owned and managed by them and, in many cases, the significant inputs used in the valuation techniques are not reasonably available to us. However, we have an understanding of the processes and assumptions used to develop the prices based on our ongoing due diligence, which includes discussions with our vendors at least annually and often more frequently. We believe that the procedures executed by the pricing services and dealers, combined with our internal verification and analytical procedures, provide assurance that the prices used in our financial statements comply with the accounting guidance for fair value measurements and disclosures and reflect the assumptions that a market participant would use in pricing our assets and liabilities. The price quotes we receive are non-binding both to us and to our counterparties.
In many cases, we receive prices from third-party pricing services or dealers and use those prices without adjustment. For a large majority of the assets and liabilities we value using pricing services and dealers, we obtain prices from multiple external sources and use the median of the prices to measure fair value. This technique is referred to below as “median of external sources.” The significant inputs used in the fair value measurement of assets and liabilities that are valued using the median of external sources pricing technique are the third-party prices. Significant increases (decreases) in any of the third-party prices in isolation may result in a significantly higher (lower) fair value measurement. In limited circumstances, we may be able to receive pricing information from only a single external source. This technique is referred to below as “single external source.”
In limited circumstances, we receive prices or pricing-related data that we adjust or use as an input to our models or other valuation techniques to measure fair value, as described in “Valuation Techniques for Assets and Liabilities Measured on Our Consolidated Balance Sheets at Fair Value — Derivative Assets, Net and Derivative Liabilities, Net.” In other limited circumstances, we receive prices from a third-party provider and use those prices without adjustment, but the inputs used by the third-party provider to develop the prices are reasonably available to us, as described in “Valuation Techniques for Assets and Liabilities Measured on Our Consolidated Balance Sheets at Fair Value — Mortgage Loans, Held-for-Sale” and “— Other Assets and Other Liabilities.”
Valuation Techniques for Assets and Liabilities Measured on Our Consolidated Balance Sheets at Fair Value
We categorize assets and liabilities that we measure and report on our consolidated balance sheets at fair value within the fair value hierarchy based on the valuation techniques used to derive the fair value and our judgment regarding the observability of the related inputs. The following is a description of the valuation techniques we use for fair value measurement and disclosure; the significant inputs used in those techniques (if applicable); our basis for classifying the measurements as Level 1, Level 2, or Level 3 of the fair value hierarchy; and, for those measurements classified as Level 3 of the hierarchy, a narrative description of the sensitivity of the fair value measurement to changes in significant unobservable inputs and a description of any interrelationships between those unobservable inputs. Although the sensitivities of the unobservable inputs are generally discussed below in isolation, interrelationships exist among the inputs such that a change in one unobservable input typically results in a change to one or more of the other inputs. For example, the most common interrelationship that impacts the majority of our fair value measurements is between future interest rates, prepayment speeds, and probabilities of default. Generally, a change in the assumption used for future interest rates results in a directionally opposite change in the assumption used for prepayment speeds and a directionally similar change in the assumption used for probabilities of default.
Each technique discussed below may not be used in a given reporting period, depending on the composition of our assets and liabilities measured at fair value and relevant market activity during that period.
Investments in Securities
Mortgage-Related Securities
Agency Securities
Agency securities, both trading and available-for-sale, consist of mortgage-related securities issued and guaranteed by Freddie Mac, Fannie Mae, and Ginnie Mae. The valuation techniques for agency securities vary depending on the type of security.
Fixed-rate single-class securities are valued using observable prices for similar securities in the TBA market. The observable TBA prices vary based on agency, term, coupon, and settlement date. In addition, we may adjust the TBA price accordingly based on matrices we receive from external dealers for securities with specific collateral characteristics if we observe those collateral characteristics to be trading at a premium or discount to the TBA price. Significant inputs used in this technique are the TBA prices and the security characteristics mentioned above. These securities have observable market pricing and are classified as Level 2.
Adjustable-rate single-class securities and the majority of multiclass securities are valued using the median of external sources. For certain multiclass securities we are able to receive prices from only a single external source. Adjustable-rate single-class securities and the multiclass securities valued using these techniques generally have observable market prices and are classified as Level 2. However, certain multiclass securities valued using these techniques are classified as Level 3 when there is a low volume or level of activity in the market for those securities.
Certain multiclass securities for which we are not able to obtain external prices due to limited relevant market activity are valued using a discounted cash flow technique. Under this technique, securities are valued by starting with a third-party market price for a similar security within our portfolio. We then use our proprietary prepayment and interest rate models to calculate an OAS for the similar security, which is used to determine the net present value of the projected cash flows for the security to be valued. The significant unobservable input used in the fair value measurement of these securities is the OAS. Significant increases (decreases) in the OAS in isolation would result in a significantly lower (higher) fair value measurement. These securities are classified as Level 3 as significant inputs used in the fair value measurement are unobservable.
Certain complex multiclass securities for which current cash flow information is not readily available are valued using a risk-metric pricing technique. Under this technique, securities are valued by starting with a prior period price and adjusting that price for market changes in certain key risk metrics such as key rate durations. If necessary, our judgment is applied to adjust the price based on specific security characteristics. The significant unobservable inputs used in the fair value measurement of these securities are the key risk metrics. Significant increases (decreases) in key rate durations in isolation would result in a significantly lower (higher) fair value measurement. These securities are classified as Level 3 as significant inputs used in the fair value measurement are unobservable.
Commercial Mortgage-Backed Securities
The majority of our CMBS are valued using the median of external sources. For a small number of CMBS, we are able to receive prices from only a single external source. CMBS valued using these techniques generally have observable market pricing and are classified as Level 2. However, certain CMBS valued using these techniques are classified as Level 3 when there is a low volume or level of activity in the market for those securities.
Subprime, Option ARM, and Alt-A and Other (Mortgage-Related); Obligations of States and Political Subdivisions; and Manufactured Housing
Subprime, option ARM, and Alt-A and other securities consist of non-agency mortgage-related securities backed by subprime, option ARM, and/or Alt-A and other collateral. Obligations of states and political subdivisions consist primarily of housing revenue bonds. Manufactured housing securities consist of non-agency mortgage-related securities backed by loans on manufactured housing properties. These types of securities are all valued based on the median of external sources and are classified as Level 3 due to the low volume and level of activity in the markets for these securities.
U.S. Treasury Securities
U.S. Treasury securities are valued using quoted prices in active markets for identical assets and are classified as Level 1.
Mortgage Loans, Held-for-Sale
Mortgage loans, held-for-sale consist of multifamily mortgage loans with the fair value option elected that are measured at fair value on a recurring basis.
Our multifamily mortgage loans, held-for-sale are primarily valued using market prices from a third-party pricing service that uses a discounted cash flow technique calibrated to the exit price for these loans as reflected in the K Certificate securitization market. Under this technique, the pricing service forecasts cash flows for the various mortgage loans and discounts them at a market rate, including a spread that is based on our recent securitization activity, which we have defined as our principal exit market. These loans are classified as Level 2 given the observable nature of our securitization pricing.
Mortgage Loans, Held-for-Investment
Mortgage loans, held-for-investment consist of single-family and multifamily mortgage loans where the measurement of impairment is based on the fair value of the underlying collateral. These loans are measured at fair value on a non-recurring basis and are classified as Level 3 as significant inputs used in the fair value measurement are unobservable.
Single-family
The collateral is valued using our internal model that uses REO disposition, short sale and third-party sale values, combined with loan level characteristics using the repeat housing sales index to estimate the current fair value of the loan. The inputs used in the fair value measurement are the historical average sales proceeds and the repeat housing sales index. Significant increases (decreases) in the historical average sales proceeds per loan in isolation would result in significantly higher (lower) fair value measurements.
Multifamily
The underlying collateral is primarily valued using either an income capitalization technique or third-party appraisals.
Under the income capitalization technique, the collateral is valued by discounting the present value of future cash flows by applying an overall capitalization rate to the forecasted net operating income. The significant unobservable input used in the fair value measurement of these loans is the capitalization rate, which is determined through analysis of the DSCR. Significant increases (decreases) in the capitalization rate in isolation would result in a significantly lower (higher) fair value measurement.
Under the third-party appraisal technique, we use the prices provided by third-party appraisers without adjustment. The third-party appraisers consider the physical condition of the property and use comparable sales and other market data in determining the appraised value.
Derivative Assets, Net and Derivative Liabilities, Net
Derivative assets and derivative liabilities consist of interest-rate swaps, option-based derivatives, and other derivatives, such as exchange-traded futures and certain forward purchase and sale commitments.
Interest-Rate Swaps
Interest-rate swaps consist of receive-fixed, pay-fixed, and basis swaps. The majority of our interest-rate swaps are valued using a discounted cash flow technique. Under this technique, interest-rate swaps are valued by using the appropriate yield curves to discount the expected cash flows of both the fixed and variable rate components of the swap contracts. The significant inputs used in the fair value measurement of these derivatives are market-based interest rates. These derivatives are classified as Level 2 as the significant inputs used in the fair value measurement are observable in active markets.
Option-Based Derivatives
Option-based derivatives consist of interest rate caps, interest rate floors, call swaptions, and put swaptions. We value the majority of our option-based derivatives using an option-pricing model. Dealer-supplied interest rate volatility matrices are a key input into the model. Within each matrix, prices are provided for a range of option terms, swap terms, and strikes. Our model then interpolates between swaption terms to determine the volatility for each instrument. This volatility is the input to the option-pricing model to establish the price. These derivatives are classified as Level 2 as the significant inputs used are observable in active markets.
Option-based derivatives also include options on exchange-traded futures. See "— Other Derivatives" for more information.
Other Derivatives
Other derivatives consist of exchange-traded futures and certain forward purchase and sale commitments.
Exchange-traded futures are valued using quoted prices in active markets for identical assets or liabilities and are classified as Level 1.
Certain purchase and sale commitments are also considered to be derivatives and are valued using the same techniques we use to value the underlying instruments we are committing to purchase or sell. These instruments generally have observable market pricing and are classified as Level 2. Valuation techniques for commitments to purchase or sell investment securities and to extinguish or issue debt securities of consolidated trusts are further discussed in “Investments in Securities.” Valuation techniques for commitments to purchase single-family mortgage loans are further discussed in “Valuation Techniques for Assets and Liabilities Not Measured on Our Consolidated Balance Sheets at Fair Value, but for Which the Fair Value is Disclosed — Mortgage Loans.”
Other Assets and Other Liabilities
Other assets consist of our guarantee asset related to guarantees issued to unconsolidated securitization trusts and mortgage servicing rights. Other liabilities, from time to time, consist of mortgage servicing rights.
Guarantee Asset
Our guarantee asset is primarily related to our multifamily guarantees. The multifamily guarantee asset is valued using a discounted cash flow technique. Under this technique, the present value of future cash flows related to our management and guarantee fee is discounted based on the current OAS-to-benchmark interest rates for new guarantees, which are driven by changes in our estimates of credit risk and changes in the credit profile of the multifamily guarantee portfolio. The significant unobservable input used in the fair value measurement of the guarantee asset is the OAS-to-benchmark rates. Significant increases (decreases) in the OAS in isolation would result in a significantly lower (higher) fair value measurement.
Our guarantee asset also consists of single family guarantees primarily related to long-term standby commitments, the vast majority of which is valued using the median of external sources. Under this technique, we obtain multiple price quotes from dealers, who provide estimates based on pricing for comparable benchmark securities with specific adjustments to reflect the unique characteristics of this asset class.
The guarantee asset is classified as Level 3 as significant inputs used in the fair value measurement are unobservable.
All Other Assets and Liabilities
All other assets and, from time to time, other liabilities consist primarily of mortgage servicing rights. Mortgage servicing rights are valued using a discounted cash flow technique by a third-party vendor that specializes in valuing and brokering sales of mortgage servicing rights. Under this technique, the cash flows from the mortgage servicing rights are discounted based on estimated prepayment rates, estimated costs to service both performing and non-accrual loans, and estimated servicing income per loan (including ancillary income). The significant unobservable inputs used in the fair value measurement of mortgage servicing rights are the estimates of prepayment rates, costs to service per loan, and servicing income per loan. Significant increases (decreases) in cost to service per loan and prepayment rate in isolation would result in a significantly lower (higher) fair value measurement. Significant increases (decreases) in servicing income per loan in isolation would result in a significantly higher (lower) fair value measurement. Mortgage servicing rights are classified as Level 3 as significant inputs used in the fair value measurement are unobservable.
REO, Net
REO, net consists primarily of single-family REO. REO, net is initially measured at its fair value less costs to sell, and is subsequently measured at the lower of cost or fair value less costs to sell. REO, net is valued using an internal model and is classified as Level 3 as significant inputs used in the fair value measurement are unobservable.
Beginning in the third quarter of 2014, our internal model uses REO disposition prices combined with loan level characteristics using the repeat housing sales index to estimate the current fair value of the REO. This valuation technique is used to measure both the initial value of REO and the valuation of REO at the lower of cost or fair value, as necessary. The significant unobservable inputs used in the fair value measurement of REO, net are the historical sales proceeds per property and the repeat housing sales index. Significant increases (decreases) in the historical sales proceeds per property in isolation would result in significantly higher (lower) fair value measurement.
As of December 31, 2013, our internal model used actual REO disposition prices for the prior three months, calibrated to the most recent month's disposition prices, to determine the average sales proceeds per property at the state level, expressed as a fixed percentage based on the ratio of the disposition price to the UPB of the associated loan. This fixed percentage was then applied to the UPB immediately prior to the acquisition to determine the fair value of the individual property. Certain adjustments, such as state-level adjustments, were made to the estimated fair value, as applicable. The significant unobservable input used in the fair value measurement of REO, net was the historical average sales proceeds per property by state. Significant increases (decreases) in the historical average sales proceeds per property by state in isolation would result in a significantly higher (lower) fair value measurement.
Debt Securities of Consolidated Trusts Held by Third Parties, at Fair Value
We elected the fair value option for interest-only debt securities of consolidated trusts held by third parties. These consist of a multifamily K Certificate where we are the primary beneficiary and certain REMICs. These are valued using either the median of external sources or a single external source (which may be the counterparty to the transaction) and are classified as Level 2 due to market pricing that is observable. See “Fair Value Option — Debt Securities of Consolidated Trusts Held by Third Parties” for additional information.
Other Debt, at Fair Value
We elected the fair value option on our STACR debt notes. Our STACR debt notes are valued using the median of external sources and are classified as Level 2 based on observable market prices. See “Fair Value Option — Other Debt” for additional information.
Quantitative Information about Level 3 Fair Value Measurements for Assets and Liabilities Measured on Our Consolidated Balance Sheets at Fair Value
The table below provides valuation techniques, the range, and the weighted average of significant unobservable inputs for assets and liabilities measured on our consolidated balance sheets at fair value on a recurring basis using unobservable inputs (Level 3) as of December 31, 2014 and 2013.
Table 16.4 — Quantitative Information about Recurring Level 3 Fair Value Measurements
	31-Dec-14
	Total			Level  3			Predominant		Unobservable Inputs
	Fair			Fair			Valuation
	Value			Value			Technique(s)		Type	Range		Weighted
												Average
	(dollars in millions)
Recurring fair value measurements
Assets
Investments in securities
Available-for-sale, at fair value
Mortgage-related securities
Freddie Mac				$	2,980		Discounted cash flows		OAS	(146) - 144 bps		83 bps
				375			Risk metric		Effective duration(1)	0.18 - 7.54 years		3.82 years
				143			Median of external sources		External pricing sources	$103.2 - $104.4		$	103.8
				733			Other
Total Freddie Mac	$	39,099		4,231
Fannie Mae				47			Median of external sources
				29			Discounted cash flows
				9			Other
Total Fannie Mae	11,313			85
Ginnie Mae				4			Discounted cash flows
Total Ginnie Mae	199			4
CMBS				2,726			Risk Metrics		Effective duration(1)	5.84 - 10.65 years		9.59 years
				748			Discounted cash flows		OAS	181 -766 bps		421 bps
Total CMBS	21,822			3,474
Subprime, option ARM, and Alt-A:
Subprime				18,789			Median of external sources		External pricing sources	$71.0 - $76.1		$	73.5
				1,800			Other
Total subprime	20,589			20,589
Option ARM				5,205			Median of external sources		External pricing sources	$65.3 - $70.9		$	67.9
				444			Other
Total option ARM	5,649			5,649
Alt-A and other				4,116			Median of external sources		External pricing sources	$83.0 - $86.2		$	84.5
				911			Other
Total Alt-A and other	5,043			5,027
Obligations of states and political subdivisions				1,992			Median of external sources		External pricing sources	$101.3 - $101.9		$	101.6
				206			Other
Total obligations of states and political subdivisions	2,198			2,198
Manufactured housing				515			Median of external sources		External pricing sources	$89.3 - $92.4		$	91
				123			Single external source		External pricing source	$89.8 - $89.8		$	89.8
Total manufactured housing	638			638
Total available-for-sale mortgage-related securities	106,550			41,895
Trading, at fair value
Mortgage-related securities
Freddie Mac				478			Discounted cash flows		OAS	(219) - 9,748 bps		169 bps
				320			Risk Metrics		Effective duration(1)	1.78 - 2.30 years		2.27 years
				129			Other
Total Freddie Mac	17,469			927
Fannie Mae				207			Discounted cash flows		OAS	(173) - 2,027 bps		204 bps
				25			Other
Total Fannie Mae	6,099			232
Ginnie Mae	16			1
Other				3			Median of external sources
				1			Discounted cash flows
Total other	171			4
Total trading mortgage-related securities	23,755			1,164
Total investments in securities	$	130,305		$	43,059
Other assets:
Guarantee asset, at fair value				$	1,285		Discounted cash flows		OAS	17 - 202 bps		53 bps
				341			Median of external sources		External pricing sources	$10.0 - $21.2		$	16.6
Total guarantee asset, at fair value	$	1,626		1,626
All other, at fair value				5			Other
Total all other, at fair value	5			5
Total other assets	1,631			1,631
Liabilities
Net derivatives				10			Other
Total net derivatives	1,141			10
	December 31, 2013
	Total			Level  3			Predominant		Unobservable Inputs
	Fair			Fair			Valuation
	Value			Value			Technique(s)		Type	Range		Weighted
												Average
	(dollars in millions)
Recurring fair value measurements
Assets
Investments in securities
Available-for-sale, at fair value
Mortgage-related securities
Freddie Mac				$	1,547		Risk metric		Effective duration(1)	2.25 -5.17 years		2.44 years
				133			Single external source		External pricing source	$99.3 - $99.3		$	99.3
				259			Other
Total Freddie Mac	$	40,659		1,939
Fannie Mae				91			Single external source		External pricing source	$110.5 - $110.5		$	110.5
				26			Median of external sources		External pricing sources	$104.1 - $105.3		$	104.7
				14			Other
Total Fannie Mae	10,797			131
Ginnie Mae				6			Median of external sources
				6			Discounted cash flows
Total Ginnie Mae	167			12
CMBS				2,942			Single external source		External pricing source	$90.9 - $90.9		$	90.9
				167			Other
Total CMBS	30,338			3,109
Subprime, option ARM, and Alt-A:
Subprime				25,367			Median of external sources		External pricing sources	$64.5 - $73.8		$	68.7
				2,132			Other
Total subprime	27,499			27,499
Option ARM				4,995			Median of external sources		External pricing sources	$60.8 - $67.0		$	64.4
				705			Discounted cash flows		OAS	461 - 944 bps		729 bps
				874			Other
Total option ARM	6,574			6,574
Alt-A and other				4,028			Single external source		External pricing source	$83.4 - $83.4		$	83.4
				3,503			Median of external sources		External pricing sources	$72.5 - $79.1		$	75.7
				1,175			Other
Total Alt-A and other	8,706			8,706
Obligations of states and political subdivisions				3,067			Median of external sources		External pricing sources	$98.7 - $99.7		$	99.2
				428			Other
Total obligations of states and political subdivisions	3,495			3,495
Manufactured housing				577			Median of external sources		External pricing sources	$86.7 - $92.8		$	89.7
				107			Other
Total manufactured housing	684			684
Total available-for-sale mortgage-related securities	128,919			52,149
Trading, at fair value
Mortgage-related securities
Freddie Mac				297			Discounted cash flows		OAS	(5) - 9,441 bps		364 bps
				46			Other
Total Freddie Mac	9,349			343
Fannie Mae				191			Discounted cash flows		OAS	(2,257) - 2,295 bps		199 bps
				30			Other
Total Fannie Mae	7,180			221
Ginnie Mae				74			Median of external sources
Total Ginnie Mae	98			74
Other				7			Single external source
				1			Other
Total other	141			8
Total trading mortgage-related securities	16,768			646
Total investments in securities	$	145,687		$	52,795
Other assets:
Guarantee asset, at fair value				$	1,163		Discounted cash flows		OAS	16 - 202 bps		53 bps
				448			Median of external sources		External pricing sources	$11.6 - $25.4		$	19.2
Total guarantee asset, at fair value	$	1,611		1,611
All other, at fair value				9			Other
Total all other, at fair value	9			9
Total other assets	1,620			1,620
Liabilities
Other debt, at fair value				1,000			Single external source		External pricing source	$100.0 - $100.0		$	100
				528			Median of external sources		External pricing sources	$100.0 - $100.1		$	100
Total other debt recorded at fair value	2,683			1,528
Net derivatives				283			Single external source		External pricing source	$0.8 - $0.8		$	0.8
				37			Discounted cash flows
				5			Other
Total net derivatives	(883		)	325
-1	Effective duration is used as a proxy to represent the aggregate impact of key rate durations.
The table below provides valuation techniques, the range, and the weighted average of significant unobservable inputs for assets and liabilities measured on our consolidated balance sheets at fair value on a non-recurring basis using unobservable inputs (Level 3) as of December 31, 2014 and 2013.
Table 16.5 — Quantitative Information about Non-Recurring Level 3 Fair Value Measurements
	31-Dec-14
	Total			Level 3			Predominant		Unobservable Inputs
	Fair			Fair			Valuation
	Value			Value			Technique(s)		Type	Range		Weighted
												Average
	(dollars in millions)
Non-recurring fair value measurements
Mortgage loans	$	8,962		$	8,962
							Internal model		Historical sales	$3,000 - $896,519		$162,556
									proceeds
							Internal model		Housing sales index	38 - 294 bps		82 bps
							Third-party appraisal		Property value	$11 million - $44 million		$31 million
							Income capitalization(1)		Capitalization rates	6%- 9%		7%
REO, net(2)	$	1,665		$	1,665
							Internal model		Historical sales	$3,008 - $896,519		$154,165
									proceeds
							Internal model		Housing sales index	38 - 294 bps		82 bps
	31-Dec-13
	Total			Level  3			Predominant		Unobservable Inputs
	Fair			Fair			Valuation
	Value			Value			Technique(s)		Type	Range		Weighted
												Average
	(dollars in millions)
Non-recurring fair value measurements
Mortgage loans	$	515		$	515
							Income capitalization(1)		Capitalization rates	6% - 9%		7%
							Third-party appraisal		Property value	$4 million - $44 million		$27 million
REO, net(2)	$	1,837		$	1,837		Internal model		Historical average sales	$17,500- $318,391		$105,508
									proceeds per property
									by state
-1	The predominant valuation technique used for multifamily mortgage loans. Certain loans in this population are valued using other techniques, and the capitalization rate for those is not represented in the “Range” or “Weighted Average” above.
-2	The national average REO disposition severity ratio for our REO properties was 34.7% and 36.5% for the years ended December 31, 2014 and 2013, respectively.
Fair Value of Financial Instruments
The table below presents the carrying value and estimated fair value of our financial instruments as of December 31, 2014 and 2013.
Table 16.6 — Fair Value of Financial Instruments
	31-Dec-14
				Fair Value
	GAAP Carrying  Amount			Level 1			Level 2			Level 3				Netting Adjustments			Total
	(in millions)
Financial Assets
Cash and cash equivalents	$	10,928		$	10,928		$	—		$	—			$	—		$	10,928
Restricted cash and cash equivalents	8,535			8,535			—			—				—			8,535
Federal funds sold and securities purchased under agreements to resell	51,903			—			51,903			—				—			51,903
Investments in securities:
Available-for-sale, at fair value	106,550			—			64,655			41,895				—			106,550
Trading, at fair value	30,437			6,682			22,591			1,164				—			30,437
Total investments in securities	136,987			6,682			87,246			43,059				—			136,987
Mortgage loans:
Mortgage loans held by consolidated trusts	1,558,094			—			1,387,412			197,896				—			1,585,308
Unsecuritized mortgage loans	142,486			—			22,305			119,157				—			141,462
Total mortgage loans	1,700,580			—			1,409,717			317,053				—			1,726,770
Derivative assets, net	822			5			9,912			27				(9,122		)	822
Guarantee asset	1,626			—			—			1,837				—			1,837
Total financial assets	$	1,911,381		$	26,150		$	1,558,778		$	361,976			$	(9,122	)	$	1,937,782
Financial Liabilities
Debt, net:
Debt securities of consolidated trusts held by third parties	$	1,479,473		$	—		$	1,521,508		$	1,364			$	—		$	1,522,872
Other debt	450,069			—			444,748			13,371				—			458,119
Total debt, net	1,929,542			—			1,966,256			14,735				—			1,980,991
Derivative liabilities, net	1,963			28			13,495			37				(11,597		)	1,963
Guarantee obligation	1,623			—			—			3,127				—			3,127
Total financial liabilities	$	1,933,128		$	28		$	1,979,751		$	17,899			$	(11,597	)	$	1,986,081
	December 31, 2013
				Fair Value
	GAAP Carrying Amount			Level 1			Level 2			Level 3				Netting Adjustments			Total
	(in millions)
Financial Assets
Cash and cash equivalents(1)	$	11,281		$	11,281		$	—		$	—			$	—		$	11,281
Restricted cash and cash equivalents	12,265			12,264			1			—				—			12,265
Federal funds sold and securities purchased under agreements to resell	62,383			—			62,383			—				—			62,383
Investments in securities:
Available-for-sale, at fair value	128,919			—			76,770			52,149				—			128,919
Trading, at fair value	23,404			6,636			16,122			646				—			23,404
Total investments in securities	152,323			6,636			92,892			52,795				—			152,323
Mortgage loans:
Mortgage loans held by consolidated trusts	1,529,905			—			1,258,049			249,693				—			1,507,742
Unsecuritized mortgage loans	154,885			—			16,145			122,065				—			138,210
Total mortgage loans	1,684,790			—			1,274,194			371,758				—			1,645,952
Derivative assets, net	1,063			—			14,220			11				(13,168		)	1,063
Guarantee asset	1,611			—			—			1,879				—			1,879
Total financial assets	$	1,925,716		$	30,181		$	1,443,690		$	426,443			$	(13,168	)	$	1,887,146
Financial Liabilities
Debt, net:
Debt securities of consolidated trusts held by third parties(2)	$	1,433,984		$	—		$	1,434,208		$	2,690			$	—		$	1,436,898
Other debt	506,767			—			499,756			13,089				—			512,845
Total debt, net	1,940,751			—			1,933,964			15,779				—			1,949,743
Derivative liabilities, net	180			—			13,291			336				(13,447		)	180
Guarantee obligation	1,522			—			—			3,067				—			3,067
Total financial liabilities	$	1,942,453		$	—		$	1,947,255		$	19,182			$	(13,447	)	$	1,952,990
-1	Includes a reclassification of $3.9 billion to the classification of previously disclosed amounts related to cash and cash equivalents between level 1 and level 2. This reclassification reflects a change in methodology and is not material to the financial statements.
-2	Includes a reclassification of $1.7 billion to the classification of previously disclosed amounts related to debt securities of consolidated trusts held by third parties between level 2 and level 3. This reclassification reflects a correction of an error and is not material to the financial statements.
Valuation Techniques for Assets and Liabilities Not Measured on Our Consolidated Balance Sheets at Fair Value, but for Which the Fair Value is Disclosed
The following is a description of the valuation techniques we use for items not measured on our consolidated balance sheets at fair value, but for which the fair value is disclosed, the significant inputs used in those techniques (if applicable), and our basis for classifying the measurements as Level 1, Level 2, or Level 3 of the valuation hierarchy. Each technique discussed below may not be used in a given reporting period, depending on the composition of our assets and liabilities measured at fair value and relevant market activity during that period.
Cash and Cash Equivalents (including Restricted Cash and Cash Equivalents)
Cash and cash equivalents (including restricted cash and cash equivalents) largely consist of highly liquid investment securities with an original maturity of three months or less used for cash management purposes, as well as cash held at financial institutions and cash collateral posted by our derivative counterparties. Given that these assets are short-term in nature with limited market value volatility, the carrying amount on our GAAP consolidated balance sheets is deemed to be a reasonable approximation of fair value. Cash and restricted cash are classified as Level 1.
Federal Funds Sold and Securities Purchased Under Agreements to Resell
Federal funds sold and securities purchased under agreements to resell principally consist of short-term contractual agreements such as reverse repurchase agreements involving U.S. Treasury and agency securities and federal funds sold. Given that these assets are short-term in nature, the carrying amount on our GAAP consolidated balance sheets is deemed to be a reasonable approximation of fair value. Federal funds sold and securities purchased under agreements to resell are classified as Level 2 because these assets have observable market pricing, but quoted prices for identical assets are not available.
Mortgage Loans
Single-family and multifamily mortgage loans classified as held-for-investment are recorded at amortized cost. Certain held-for-investment single-family and multifamily mortgage loans are recorded at the fair value of the underlying collateral upon impairment. Multifamily held-for-sale mortgage loans are recorded at fair value due to the election of the fair value option.
Single-Family Loans
Determination of Principal Market
In determining the fair value of single-family mortgage loans, valuation outcomes can vary widely based on management judgments and decisions used in determining: (a) the principal market; (b) modeling assumptions, including default, severity, home prices, and risk premiums; and (c) inputs used to determine variables including risk premiums, credit costs, security pricing, and implied management and guarantee fees. Our principal markets include the GSE securitization market and the whole loan market. To determine the principal market, we considered the market with the greatest volume and level of activity and our ability to access that market. In the absence of a market with active trading, we determined the market that would maximize the amount we would receive upon sale. We determined that the principal market is the whole loan market for loans that: (a) are four or more months delinquent; (b) are in foreclosure; (c) have completed a loan modification but have not been current for at least 6 consecutive months; (d) have completed a loan modification and have a current LTV ratio greater than 125%; or (e) have been modified through a process that included forbearance on a portion of the outstanding balance. The total UPB of loans where the whole loan market is the principal market was approximately $72.0 billion and $101.2 billion as of December 31, 2014 and 2013, respectively. We determined that the principal market for all other loans, regardless of whether the loan is currently securitized or whether the loan is eligible for purchase under current underwriting standards, is the GSE securitization market. The total UPB of loans where the GSE securitization market is the principal market was approximately $1.6 trillion and $1.5 trillion as of December 31, 2014 and 2013, respectively.
Whole Loan Market as Principal Market
Loans where we determine that the principal market is the whole loan market are valued using the median of external sources. Under the median of external sources technique, prices for single-family loans are obtained from multiple dealers. These dealers reference market activity for deeply delinquent and modified loans, where available, and use internal models and their judgment to determine default rates, severity rates, home prices, and risk premiums. Single-family mortgage loans valued using this technique are classified as Level 3 due to the low volume and level of activity in this market.
GSE Securitization Market as Principal Market
Loans where we determine that the principal market is the GSE securitization market are valued using the build-up technique. Under the build-up technique, the fair value of single-family mortgage loans is based on the estimate of the price we would receive if we were to securitize the loans. These loans are valued by starting with benchmark security pricing for actively traded mortgage-related securities with similar characteristics, adjusting for the value of our management and guarantee fee, which is the compensation we receive for performing our management and guarantee activities, and our credit obligation related to performing our guarantee.
The security price is based on benchmark security pricing for similar actively traded mortgage-related securities, adjusted as necessary based on security characteristics. This security pricing process is consistent with our approach for valuing similar securities retained in our investment portfolio or issued as debt to third parties. See “Valuation Techniques for Assets and Liabilities Measured on Our Consolidated Balance Sheets at Fair Value — Investments in Securities.”
The management and guarantee fee is valued by estimating the present value of the cash flows related to our management and guarantee fee. The management and guarantee fees for the majority of our loans are valued using third-party dealer prices on hypothetical interest-only securities based on collateral characteristics from our single-family credit guarantee portfolio. For loans where third-party market data is not readily available, we use a discounted cash flow approach, leveraging the dealer prices received for the majority of our loans and including only those cash flows related to our management and guarantee fee.
The credit obligation related to performing our guarantee is valued by estimating the fair value of the related credit and other costs (such as general and administrative expenses) and benefits (such as credit enhancements) inherent in our guarantee obligation. For loans that qualify for purchase under current underwriting standards, we use the delivery and guarantee fees that we charge under our current market pricing as a market observation. For loans that do not qualify for purchase based on current underwriting standards, we use our internal credit models, which incorporate factors such as loan characteristics, loan performance status information, expected losses, and risk premiums.
Single-family mortgage loans that qualify for purchase under current underwriting standards are classified as Level 2 as the significant inputs used for the valuation of these loans, such as security pricing, our externally published credit pricing matrices, and third-party prices used in valuing the management and guarantee fee, are observable, while the unobservable inputs, such as general and administrative expenses and credit enhancements, are not significant to the fair value measurement. Single-family mortgage loans that do not qualify for purchase under current underwriting standards are classified as Level 3 as the credit cost is based on our internal credit models which use unobservable inputs that are significant to the fair value measurement.
HARP Loans
For loans that have been refinanced under HARP, we value our guarantee obligation using the delivery and guarantee fees currently charged by us under that initiative. HARP loans valued using this technique are classified as Level 2, as the fees charged by us are observable. If, subsequent to delivery, the refinanced loan no longer qualifies for purchase based on current underwriting standards (such as becoming past due or being modified), the fair value of the guarantee obligation is then measured using: (a) our internal credit models; or (b) the median of external sources, if the loan’s principal market has changed to the whole loan market. HARP loans valued using either of these techniques are classified as Level 3 as significant inputs are unobservable. The majority of our HARP loans are classified as Level 2.
The total compensation that we receive for the delivery of a HARP loan reflects the pricing that we are willing to offer because HARP is a part of a broader government program intended to provide assistance to homeowners and prevent foreclosures. When HARP ends (currently scheduled for December 31, 2015), the beneficial pricing afforded to HARP loans will no longer be reflected in our delivery and guarantee fee pricing structure. If these benefits were not reflected in the pricing for these loans, the fair value of our mortgage loans would have decreased by $19.1 billion and $18.5 billion as of December 31, 2014 and 2013, respectively. The total fair value of the loans in our portfolio that reflects the pricing afforded to HARP loans as of December 31, 2014 and 2013 is $119.8 billion and $145.0 billion, respectively.
Multifamily Loans
For a discussion of the techniques used to determine the fair value of held-for-sale and impaired held-for-investment multifamily mortgage loans, see “Valuation Techniques for Assets and Liabilities Measured on Our Consolidated Balance Sheets at Fair Value — Mortgage Loans, Held-for-Sale” and “— Mortgage Loans, Held-for-Investment,” respectively. Non-impaired multifamily mortgage loans are primarily valued using market prices from a third-party pricing service that uses a discounted cash-flow technique. Under this technique, the pricing service forecasts cash flows for the various mortgage loans and discounts them at a market rate, including a spread that is based on pricing data obtained from purchases and sales of similar mortgage loans, adjusted based on the mortgage's current LTV ratio and DSCR. The significant unobservable inputs used in the fair value measurement of these loans are the current LTV ratio and DSCR. These loans are classified as Level 3 as significant inputs used in the fair value measurement are unobservable.
Total Debt, Net
Total debt, net represents debt securities of consolidated trusts held by third parties and other debt that we issued to finance our assets. On our consolidated GAAP balance sheets, total debt, net, excluding debt securities for which the fair value option has been elected, is reported at amortized cost, which is net of deferred items, including premiums, discounts, and hedging-related basis adjustments.
For debt securities of consolidated trusts, the valuation techniques we use are similar to the techniques we use to value our investments in agency securities for GAAP purposes. See “Valuation Techniques for Assets and Liabilities Measured on Our Consolidated Balance Sheets at Fair Value — Investments in Securities — Mortgage-Related Securities — Agency Securities” for additional information regarding the valuation techniques we use.
Other debt includes short-term zero-coupon discount notes, callable debt, and non-callable debt. Short-term zero-coupon discount notes are valued using a yield analysis technique. Under this technique, the debt instruments are valued using published yield matrices which are based on the days to maturity of the debt and converted into a price. Significant inputs used in this technique are the published yield matrices. Short-term zero-coupon discount notes are classified as Level 2 as the significant inputs used are observable in active markets. Other debt securities, including both callable and non-callable debt, are valued using a single external source or median of external sources. These debt securities generally have observable market pricing and are classified as Level 2. However, certain other debt securities are classified as Level 3 when there is a low volume or level of activity in the market for those types of debt securities.
Total debt, net for which we have elected the fair value option includes certain debt securities of consolidated trusts held by third parties and certain other debt. We report these items at fair value on our GAAP consolidated balance sheets. See “Valuation Techniques for Assets and Liabilities Measured on Our Consolidated Balance Sheets at Fair Value — Debt Securities of Consolidated Trusts Held by Third Parties, at Fair Value” and “— Other Debt, at Fair Value” for additional information.
Guarantee Obligation
Our guarantee obligation is classified as Level 3 as significant inputs used in the fair value measurement are unobservable. The technique for estimating the fair value of our guarantee obligation is described in the “Mortgage Loans — Single-Family Loans” section above.
Fair Value Option
We elected the fair value option for certain types of investments in securities, multifamily held-for-sale mortgage loans, and certain debt.
Investments in Securities
We elected the fair value option for certain mortgage-related securities to better reflect the natural offset these securities provide to fair value changes recorded historically on our guarantee asset at the time of our election. In addition, upon adoption of the accounting guidance for the fair value option, we elected this option for securities within the scope of the accounting guidance for investments in beneficial interests in securitized financial assets to better reflect any valuation changes that would occur subsequent to impairment write-downs previously recorded on these instruments. Related interest income continues to be reported as interest income in our consolidated statements of comprehensive income. See “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES — Investments in Securities” for additional information about the measurement and recognition of interest income on investments in securities. For information regarding the net unrealized gains (losses) on trading securities, which include gains (losses) for other items that are not selected for the fair value option, see Gains (losses) on trading securities within “Table 13.2 — Segment Earnings and Reconciliation to GAAP Results."
Multifamily Held-For-Sale Mortgage Loans
We elected the fair value option for multifamily mortgage loans that were purchased for securitization. These multifamily mortgage loans are classified as held-for-sale mortgage loans on our consolidated balance sheets to reflect our intent to sell in the future. Related interest income continues to be reported as interest income in our consolidated statements of comprehensive income. See “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES — Mortgage Loans” for additional information about the measurement and recognition of interest income on our mortgage loans.
Debt Securities of Consolidated Trusts Held by Third Parties
We elected the fair value option for certain debt securities of consolidated trusts held by third parties. These consist of a multifamily K Certificate where we are in a first loss position and certain REMIC interest-only mortgage-related debt securities. We elected the fair value option on these debt instruments as they contain embedded derivatives that require bifurcation. Fair value changes for debt securities of consolidated trusts held by third parties are recorded in other income in our consolidated statements of comprehensive income. Related interest expense continues to be reported as interest expense in our consolidated statements of comprehensive income. See “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES — Debt Securities Issued” for additional information about the measurement and recognition of interest expense on debt securities issued.
Other Debt
We elected the fair value option on our STACR debt notes to better reflect the economic offset that naturally results from the debt due to changes in interest rates. Fair value changes for debt for which we have elected the fair value option are recorded in other income in our consolidated statements of comprehensive income. Related interest expense continues to be reported as interest expense in our consolidated statements of comprehensive income. See “NOTE 1: SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES — Debt Securities Issued” for additional information about the measurement and recognition of interest expense on debt securities issued.
The table below presents the fair value and UPB related to certain items for which we have elected the fair value option at December 31, 2014 and 2013.
Table 16.7 — Difference between Fair Value and Unpaid Principal Balance for Certain Financial Instruments with Fair Value Option Elected
	December 31,
	2014						2013
	Multifamily			Other Debt -			Multifamily			Other Debt -
	Held-For-Sale			Long Term			Held-For-Sale			Long Term
	Mortgage Loans						Mortgage Loans
	(in millions)
Fair value	$	12,130		$	5,820		$	8,727		$	2,683
Unpaid principal balance	11,872			5,896			8,721			2,635
Difference	$	258		$	(76	)	$	6		$	48
Changes in Fair Value under the Fair Value Option Election
We recorded gains (losses) of $0.9 billion, $(0.3) billion, and $1.0 billion for the years ended December 31, 2014, 2013, and 2012, respectively, from the change in fair value on multifamily held-for-sale mortgage loans recorded at fair value in other income in our consolidated statements of comprehensive income.
Gains (losses) on debt securities with the fair value option elected were $144 million, $(37) million, and $16 million for the years ended December 31, 2014, 2013, and 2012, respectively, and were recorded in other income in our consolidated statements of comprehensive income.
Changes in fair value attributable to instrument-specific credit risk were not material for the years ended December 31, 2014, 2013, or 2012 for any assets or liabilities for which we elected the fair value option.

Legal_Contingencies

Legal Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
LEGAL CONTINGENCIES	NOTE 17: LEGAL CONTINGENCIES
	We are involved as a party in a variety of legal and regulatory proceedings arising from time to time in the ordinary course of business including, among other things, contractual disputes, personal injury claims, employment-related litigation and other legal proceedings incidental to our business. We are frequently involved, directly or indirectly, in litigation involving mortgage foreclosures. From time to time, we are also involved in proceedings arising from our termination of a seller/servicer’s eligibility to sell mortgages to, and/or service mortgages for, us. In these cases, the former seller/servicer sometimes seeks damages against us for wrongful termination under a variety of legal theories. In addition, we are sometimes sued in connection with the origination or servicing of mortgages. These suits typically involve claims alleging wrongful actions of seller/servicers. Our contracts with our seller/servicers generally provide for indemnification of Freddie Mac against liability arising from seller/servicers' wrongful actions with respect to mortgages sold to or serviced for Freddie Mac.
	Litigation and claims resolution are subject to many uncertainties and are not susceptible to accurate prediction. In accordance with the accounting guidance for contingencies, we reserve for litigation claims and assessments asserted or threatened against us when a loss is probable (as defined in such guidance) and the amount of the loss can be reasonably estimated.
	During 2014, we paid approximately $15 million for the advancement of legal fees and expenses of former officers pursuant to our indemnification obligations to them. These fees and expenses related to certain of the matters described below, and are being partially offset by insurance payments. This figure does not include certain administrative support costs and certain costs related to document production and storage.
	Putative Securities Class Action Lawsuit: Ohio Public Employees Retirement System (“OPERS”) vs. Freddie Mac, Syron, et al.
	This putative securities class action lawsuit was filed against Freddie Mac and certain former officers on January 18, 2008 in the U.S. District Court for the Northern District of Ohio purportedly on behalf of a class of purchasers of Freddie Mac stock from August 1, 2006 through November 20, 2007. FHFA later intervened as Conservator, and the plaintiff amended its complaint on several occasions. The plaintiff alleged, among other things, that the defendants violated federal securities laws by making false and misleading statements concerning our business, risk management, and the procedures we put into place to protect the company from problems in the mortgage industry. The plaintiff sought unspecified damages and interest, and reasonable costs and expenses, including attorney and expert fees.
	Defendants filed motions to dismiss the second and third amended complaints, which the Court initially denied. On April 13, 2013, the judge who had presided over the case since 2008 recused himself, and the case was reassigned to a new judge. On August 23, 2013, the new judge granted defendants' motion to vacate the previous judge's orders denying defendants' motions to dismiss. Defendants filed new motions to dismiss the complaint on October 8, 2013. On October 31, 2014, the Court granted defendants’ motions and dismissed the case in its entirety against all defendants, with prejudice. On November 25, 2014, plaintiff filed a notice of appeal in the U.S. Court of Appeals for the Sixth Circuit.
	At present, it is not possible for us to predict the probable outcome of this lawsuit or any potential effect on our business, financial condition, liquidity, or results of operations. In addition, we are unable to reasonably estimate the possible loss or range of possible loss in the event of an adverse judgment in the foregoing matter due to the following factors, among others: the inherent uncertainty of the appellate process; the inherent uncertainty of pre-trial litigation in the event the case is ultimately remanded to the District Court in whole or in part; and the fact that the District Court has not yet ruled upon motions for class certification or summary judgment. In particular, absent resolution of the appellate process, the certification of a class, the identification of a class period, and the identification of the alleged statement or statements that survive dispositive motions, we cannot reasonably estimate any possible loss or range of possible loss.
	Related Third Party Litigation
	On December 16, 2011, the SEC announced that it had charged three former executives of Freddie Mac with securities laws violations. These executives are former Chairman of the Board and Chief Executive Officer Richard F. Syron, former Executive Vice President and Chief Business Officer Patricia L. Cook, and former Executive Vice President for the single-family guarantee business Donald J. Bisenius.
	On July 6, 2011, a lawsuit styled Liberty Mutual Insurance Company, Peerless Insurance Company, Employers Insurance Company of Wausau, Safeco Corporation and Liberty Life Assurance Company of Boston vs. Goldman, Sachs & Co. was filed in the U.S. District Court for Massachusetts. The case was subsequently transferred to the U.S. District Court for the Southern District of New York. The defendants in the case were underwriters of the company’s November 2007 public offering of preferred stock. The plaintiffs generally alleged that the underwriters made materially misleading statements and omissions in connection with the offering. The case was voluntarily dismissed, with prejudice, on December 8, 2014. Freddie Mac was not named as a defendant in the lawsuit.
	Litigation Related to the Taylor, Bean & Whitaker (TBW) Bankruptcy
	On August 24, 2009, TBW, which had been one of our single-family seller/servicers, filed for bankruptcy in the U.S. Bankruptcy Court for the Middle District of Florida. We entered into a settlement with TBW and the TBW creditors' committee regarding the TBW bankruptcy in 2011. However, we continue to be involved in litigation with other parties relating to the TBW bankruptcy, as described below.
	On or about May 14, 2010, certain underwriters at Lloyds, London and London Market Insurance Companies brought an adversary proceeding in the U.S. Bankruptcy Court for the Middle District of Florida against TBW, Freddie Mac and other parties seeking a declaration rescinding $90 million of mortgage bankers bonds providing fidelity and errors and omissions insurance coverage. Several excess insurers on the bonds thereafter filed similar claims in that action. Freddie Mac has filed a proof of loss under the bonds. The underwriters moved for partial summary judgment against Freddie Mac in April 2013. The Court denied this motion on March 27, 2014, and the underwriters subsequently appealed the denial of the motion to the U.S. District Court. Numerous additional motions for summary judgment have been filed by the parties, including by Freddie Mac. These motions are pending. Discovery is proceeding. At present, it is not possible for us to predict the probable outcome of this lawsuit.
	On December 29, 2014, Freddie Mac filed an action in the U.S. District Court for the Southern District of New York against certain underwriters at Lloyds, London and several other insurance carriers seeking coverage for $111 million in losses under Freddie Mac’s primary and excess financial institution bonds. The losses resulted from fraud perpetrated by senior officers and employees of TBW. At present, it is not possible for us to predict the probable outcome of this lawsuit.
	On September 15, 2014, Freddie Mac filed a lawsuit in the Circuit Court of the 11th Judicial Circuit in Miami-Dade County, Florida against Deloitte & Touche LLP (Deloitte) for negligent misrepresentation / false information negligently supplied for the guidance of others. The complaint alleges, among other items, that Deloitte, as TBW’s independent auditor, made and supplied false information during the course of its professional audits of TBW, as a result of which Freddie Mac incurred damages in excess of $1.3 billion. Freddie Mac seeks damages and interest, as well as costs. On October 8, 2014, Deloitte removed the case from state court to the U.S. District Court for the Southern District of Florida. Discovery is proceeding. At present, it is not possible for us to predict the probable outcome of this lawsuit.
	IRS Litigation
	In 2010 and 2011, we received Statutory Notices from the IRS assessing a total of $3.0 billion of additional income taxes and penalties for the 1998 to 2007 tax years. We filed a petition with the U.S. Tax Court on October 22, 2010 in response to the Statutory Notices for the 1998 to 2005 tax years and, in 2012, paid the tax assessed in the Statutory Notices for the years 2006 and 2007 of $36 million. In the fourth quarter of 2012 we reached an agreement in principle with the IRS for all years, including 2006 and 2007, to favorably resolve the matters in dispute and reduced the previously unrecognized tax benefits to zero. We are currently working with the IRS to finalize the stipulation of settled issues and closing agreement for the years 1998 through 2010 related to our tax accounting method for certain hedging transactions, and expect that a final decision can be entered within the next 12 months.
	LIBOR Lawsuit
	On March 14, 2013, Freddie Mac filed a lawsuit in the U.S. District Court for the Eastern District of Virginia against the British Bankers Association and the 16 U.S. Dollar LIBOR panel banks and a number of their affiliates. The case was subsequently transferred to the U.S. District Court for the Southern District of New York. The complaint alleges, among other things, that the defendants fraudulently and collusively depressed LIBOR, a benchmark interest rate indexed to trillions of dollars of financial products, and asserts claims for antitrust violations, breach of contract, tortious interference with contract and fraud. Freddie Mac filed an amended complaint on July 22, 2013, and a second amended complaint on October 6, 2014. The defendants have moved to dismiss the second amended complaint; Freddie Mac has opposed this motion.
	Litigation Concerning the Purchase Agreement
	Since July 2013, a number of lawsuits have been filed against us concerning the August 2012 amendment to the Purchase Agreement, which created the net worth sweep dividend provisions of the senior preferred stock. The plaintiffs in the lawsuits allege that they are holders of common stock and/or junior preferred stock issued by Freddie Mac and Fannie Mae. (For purposes of this discussion, junior preferred stock refers to the various series of preferred stock of Freddie Mac and Fannie Mae other than the senior preferred stock issued to Treasury.) It is possible that similar lawsuits will be filed in the future. The lawsuits against us are described below.
	Litigation in the U.S. District Court for the District of Columbia
	In re Fannie Mae/Freddie Mac Senior Preferred Stock Purchase Agreement Class Action Litigations. This case is the result of the consolidation of three putative class action lawsuits: Cacciapelle and Bareiss vs. Federal National Mortgage Association, Federal Home Loan Mortgage Corporation and FHFA, filed on July 29, 2013; American European Insurance Company vs. Federal National Mortgage Association, Federal Home Loan Mortgage Corporation and FHFA, filed on July 30, 2013; and Marneu Holdings, Co. vs. FHFA, Treasury, Federal National Mortgage Association and Federal Home Loan Mortgage Corporation, filed on September 18, 2013. (The Marneu case was also filed as a shareholder derivative lawsuit.) A consolidated amended complaint was filed on December 3, 2013. In the consolidated amended complaint, plaintiffs allege, among other items, that the August 2012 amendment to the Purchase Agreement breached Freddie Mac's and Fannie Mae's respective contracts with the holders of junior preferred stock and common stock and the covenant of good faith and fair dealing inherent in such contracts. Plaintiffs sought unspecified damages, equitable and injunctive relief, and costs and expenses, including attorney and expert fees.
	The Cacciapelle and American European Insurance Company lawsuits were filed purportedly on behalf of a class of purchasers of junior preferred stock issued by Freddie Mac or Fannie Mae who held stock prior to, and as of, August 17, 2012. The Marneu lawsuit was filed purportedly on behalf of a class of purchasers of junior preferred stock and purchasers of common stock issued by Freddie Mac or Fannie Mae over a not-yet-defined period of time.
	Arrowood Indemnity Company vs. Federal National Mortgage Association, Federal Home Loan Mortgage Corporation, FHFA and Treasury. This case was filed on September 20, 2013. The allegations and demands made by plaintiffs in this case were generally similar to those made by the plaintiffs in the In re Fannie Mae/Freddie Mac Senior Preferred Stock Purchase Agreement Class Action Litigations case described above. Plaintiffs in the Arrowood lawsuit also requested that, if injunctive relief were not granted, the Arrowood plaintiffs be awarded damages against the defendants in an amount to be determined including, but not limited to, the aggregate par value of their junior preferred stock, the total of which they stated to be $42,297,500.
	American European Insurance Company, Cacciapalle and Miller vs. Treasury and FHFA. This case was filed as a shareholder derivative lawsuit, purportedly on behalf of Freddie Mac as a “nominal” defendant, on July 30, 2014. The complaint alleged that, through the August 2012 amendment to the Purchase Agreement, Treasury and FHFA breached their respective fiduciary duties to Freddie Mac, causing Freddie Mac to suffer damages. The plaintiffs asked that Freddie Mac be awarded compensatory damages and disgorgement, as well as attorneys’ fees, costs and other expenses.
	FHFA, joined by Freddie Mac and Fannie Mae, moved to dismiss the In re Fannie Mae/Freddie Mac Senior Preferred Stock Purchase Agreement Class Action Litigations case and the other related cases on January 17, 2014. Treasury filed a motion to dismiss the same day. On September 30, 2014, the District Court granted the motions and dismissed the plaintiffs’ claims. On October 15, 2014, plaintiffs in the In re Fannie Mae/Freddie Mac Senior Preferred Stock Purchase Agreement Class Action Litigations case filed a notice of appeal of the District Court’s decision. The scope of this appeal includes the American European Insurance Company shareholder derivative lawsuit. On October 9, 2014, Arrowood filed a notice of appeal of the District Court’s decision.
	Litigation in the U.S. Court of Federal Claims
	Reid and Fisher vs. the United States of America and Federal Home Loan Mortgage Corporation. This case was filed as a derivative lawsuit, purportedly on behalf of Freddie Mac as a “nominal” defendant, on February 26, 2014. The complaint alleges, among other items, that the net worth sweep dividend provisions of the senior preferred stock constitute an unlawful taking of private property for public use without just compensation. The plaintiffs ask that Freddie Mac be awarded just compensation for the U.S. government’s alleged taking of its property, attorneys’ fees, costs and other expenses.
	Rafter, Rattien and Pershing Square Capital Management vs. the United States of America, Federal National Mortgage Association and Federal Home Loan Mortgage Corporation. This case was filed as a shareholder derivative lawsuit, purportedly on behalf of Freddie Mac as a “nominal” defendant, on August 14, 2014. The complaint alleges that: (a) the net worth sweep dividend provisions of the senior preferred stock constitute an unlawful taking of private property for public use without just compensation; and (b) the U.S government breached an implied-in-fact contract with Freddie Mac. The plaintiffs ask that they be awarded just compensation for the U.S. government’s alleged taking of their property, attorneys’ fees, costs and expenses, and that Freddie Mac be awarded damages or other appropriate relief for the alleged breach of contract.
	At present, it is not possible for us to predict the probable outcome of the lawsuits discussed above in the U.S. District Court for the District of Columbia and the U.S. Court of Federal Claims (including the outcome of any appeal) or any potential effect on our business, financial condition, liquidity, or results of operations. In addition, we are unable to reasonably estimate the possible loss or range of possible loss in the event of an adverse judgment in the foregoing matters due to a number of factors, including the inherent uncertainty of pre-trial litigation. In addition, with respect to the In re Fannie Mae/Freddie Mac Senior Preferred Stock Purchase Agreement Class Action Litigations case, the plaintiffs have not demanded a stated amount of damages they believe are due, and the Court has not certified a class.
	Since October 2013, we have received a number of letters from purported holders of common stock and/or junior preferred stock. The purported shareholders made various demands in these letters, including that Freddie Mac take action to terminate the August 2012 amendment to the Purchase Agreement and commence legal action against the U.S. government to recover all losses sustained by Freddie Mac as a result of such amendment. FHFA (as Conservator) has generally informed the purported shareholders that the Conservator does not intend to authorize Freddie Mac or its directors or officers to take the various actions that such shareholders demand. All of the purported shareholders subsequently filed shareholder derivative lawsuits against Freddie Mac. These cases are among those described above. It is possible we could receive additional demand letters from purported shareholders, which could ultimately lead to additional lawsuits against us.

Regulatory_Capital

Regulatory Capital	12 Months Ended
	Dec. 31, 2014
Mortgage Banking [Abstract]
REGULATORY CAPITAL	NOTE 18: REGULATORY CAPITAL
	On October 9, 2008, FHFA announced that it was suspending capital classification of us during conservatorship in light of the Purchase Agreement. FHFA continues to monitor our capital levels, but the existing statutory and FHFA-directed regulatory capital requirements are not binding during conservatorship. We continue to provide quarterly submissions to FHFA on minimum capital.
	Our regulatory minimum capital is a leverage-based measure that is generally calculated based on GAAP and reflects a 2.50% capital requirement for on-balance sheet assets and a 0.45% capital requirement for off-balance sheet obligations. Based upon our adoption of amendments to the accounting guidance for transfers of financial assets and consolidation of VIEs, we determined that, under the new consolidation guidance, we are the primary beneficiary of trusts that issue our single-family PCs and certain Other Guarantee Transactions and, therefore, effective January 1, 2010, we consolidated on our balance sheet the assets and liabilities of these trusts. Pursuant to regulatory guidance from FHFA, our minimum capital requirement was not affected by adoption of these amendments. Specifically, upon adoption of these amendments, FHFA directed us, for purposes of minimum capital, to continue reporting single-family PCs and certain Other Guarantee Transactions held by third parties using a 0.45% capital requirement. FHFA reserves the authority under the GSE Act to raise the minimum capital requirement for any of our assets or activities.
	Regulatory Capital Standards
	The GSE Act established minimum, critical, and risk-based capital standards for us. However, per guidance received from FHFA, we no longer are required to submit risk-based capital reports to FHFA.
	Prior to our entry into conservatorship, those standards determined the amounts of core capital that we were to maintain to meet regulatory capital requirements. Core capital consisted of the par value of outstanding common stock (common stock issued less common stock held in treasury), the par value of outstanding non-cumulative, perpetual preferred stock, additional paid-in capital and retained earnings (accumulated deficit), as determined in accordance with GAAP.
	Minimum Capital
	The minimum capital standard required us to hold an amount of core capital that was generally equal to the sum of 2.50% of aggregate on-balance sheet assets and approximately 0.45% of the sum of our PCs held by third parties and other aggregate off-balance sheet obligations.
	Critical Capital
	The critical capital standard required us to hold an amount of core capital that was generally equal to the sum of 1.25% of aggregate on-balance sheet assets and approximately 0.25% of the sum of our PCs held by third parties and other aggregate off-balance sheet obligations.
	Performance Against Regulatory Capital Standards
	The table below summarizes our minimum capital requirements and deficits and net worth.
	Table 18.1 — Net Worth and Minimum Capital
		31-Dec-14			31-Dec-13
		(in millions)
	GAAP net worth	$	2,651		$	12,835
	Core capital (deficit)(1)(2)	$	(71,415	)	$	(59,495	)
	Less: Minimum capital requirement(1)	20,090			21,404
	Minimum capital surplus (deficit)(1)	$	(91,505	)	$	(80,899	)
	-1	Core capital and minimum capital figures for December 31, 2014 are estimates. FHFA is the authoritative source for our regulatory capital.
	-2	Core capital excludes certain components of GAAP total equity (i.e., AOCI and the liquidation preference of the senior preferred stock) as these items do not meet the statutory definition of core capital.
	Following our entry into conservatorship and consistent with the objectives of conservatorship, we have focused our risk and capital management on, among other things, maintaining a positive balance of GAAP equity in order to reduce the likelihood that we will need to make additional draws on the Purchase Agreement with Treasury. The Purchase Agreement provides that, if FHFA determines as of quarter end that our liabilities have exceeded our assets under GAAP, Treasury will contribute funds to us in an amount at least equal to the difference between such liabilities and assets.
	Under the GSE Act, FHFA must place us into receivership if FHFA determines in writing that our assets are and have been less than our obligations for a period of 60 days. FHFA has notified us that the measurement period for any mandatory receivership determination with respect to our assets and obligations would commence no earlier than the SEC public filing deadline for our quarterly or annual financial statements and would continue for 60 calendar days after that date. FHFA has advised us that, if, during that 60-day period, we receive funds from Treasury in an amount at least equal to the deficiency amount under the Purchase Agreement, the Director of FHFA will not make a mandatory receivership determination. If funding has been requested under the Purchase Agreement to address a deficit in our net worth, and Treasury is unable to provide us with such funding within the 60-day period specified by FHFA, FHFA would be required to place us into receivership if our assets remain less than our obligations during that 60-day period.
	At December 31, 2014, our assets exceeded our liabilities under GAAP; therefore no draw is being requested from Treasury under the Purchase Agreement. As of December 31, 2014, our aggregate funding received from Treasury under the Purchase Agreement was $71.3 billion. This aggregate funding amount does not include the initial $1 billion liquidation preference of senior preferred stock that we issued to Treasury in September 2008 as an initial commitment fee and for which no cash was received. We paid quarterly dividends of $10.4 billion, $4.5 billion, $1.9 billion, and $2.8 billion on the senior preferred stock in cash in March 2014, June 2014, September 2014, and December 31, 2014, respectively, at the direction of the Conservator.
	Subordinated Debt Commitment
	In October 2000, we announced our adoption of a series of commitments designed to enhance market discipline, liquidity and capital. In September 2005, we entered into a written agreement with FHFA that updated those commitments and set forth a process for implementing them. FHFA, as Conservator of Freddie Mac, has suspended the requirements in the September 2005 agreement with respect to issuance, maintenance and reporting and disclosure of Freddie Mac subordinated debt during the term of conservatorship and thereafter until directed otherwise.

Selected_Financial_Statement_L

Selected Financial Statement Line Items	12 Months Ended
	Dec. 31, 2014
Selected Financial Statement Data [Abstract]
Selected Financial Statement Line Items	NOTE 19: SELECTED FINANCIAL STATEMENT LINE ITEMS
	The table below presents the significant components of other income (loss) on our consolidated statements of comprehensive income.
	Table 19.1 — Significant Components of Other Income (Loss) on Our Consolidated Statements of Comprehensive Income
		Year Ended December 31,
		2014		2013			2012
		(in millions)
	Other income (loss):
	Non-agency mortgage-related securities settlements(1)	$	6,084	$	5,501		$	—
	Gains (losses) on mortgage loans	731		(336		)	1,010
	Other	1,229		1,485			1,180
	Total other income (loss)	$	8,044	$	6,650		$	2,190
	-1	Settlement agreements primarily related to lawsuits regarding our investments in certain non-agency mortgage-related securities is a significant component of other income in 2014 and 2013. For more information, see “NOTE 15: CONCENTRATION OF CREDIT AND OTHER RISKS — Non-Agency Mortgage-Related Security Issuers.”
	The table below presents the significant components of other assets and other liabilities on our consolidated balance sheets.
	Table 19.2 — Significant Components of Other Assets and Other Liabilities on Our Consolidated Balance Sheets
		31-Dec-14		31-Dec-13
		(in millions)
	Other assets:
	Accounts and other receivables(1)	$	3,899	$	4,367
	Current income tax receivable	1,048		1,316
	Guarantee asset	1,626		1,611
	All other	1,121		1,245
	Total other assets	$	7,694	$	8,539
	Other liabilities:
	Servicer liabilities	$	1,847	$	2,277
	Guarantee obligation	1,623		1,522
	Accounts payable and accrued expenses	803		886
	All other	785		807
	Total other liabilities	$	5,058	$	5,492
	-1	Primarily consists of servicer receivables and other non-interest receivables.
	END OF CONSOLIDATED FINANCIAL STATEMENTS AND ACCOMPANYING NOTES

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Segment Reporting	We have three reportable segments, which are based on the type of business activities each performs — Single-family Guarantee, Investments, and Multifamily. Our Single-family Guarantee segment reflects results from our single-family credit guarantee activities. In our Single-family Guarantee segment, we purchase and guarantee single-family mortgage loans originated by our seller/servicers in the primary mortgage market and we manage our seriously delinquent loans. In most instances, we use the mortgage securitization process to package the loans into guaranteed mortgage-related securities. We guarantee the payment of principal and interest on the mortgage-related securities in exchange for management and guarantee fees. Our Investments segment reflects results from three primary activities: (a) managing the company’s mortgage-related investments portfolio, excluding Multifamily segment investments and single-family seriously delinquent loans; (b) managing the treasury function for the entire company, including funding and liquidity; and (c) managing interest-rate risk for the entire company. In our Investments segment, we invest principally in mortgage-related securities and single-family performing mortgage loans. Our Multifamily segment reflects results from our investment (both purchases and sales), securitization, and guarantee activities in multifamily mortgage loans and securities. In our Multifamily segment, our primary business model is to purchase multifamily mortgage loans for aggregation and then securitization through issuance of multifamily K Certificates. See “NOTE 13: SEGMENT REPORTING” for additional information.
Basis of Presentation	Basis of Presentation
	The accompanying consolidated financial statements have been prepared in accordance with GAAP and include our accounts as well as the accounts of other entities in which we have a controlling financial interest. All intercompany balances and transactions have been eliminated.
	Our current accounting policies are described below. We are operating under the basis that we will realize assets and satisfy liabilities in the normal course of business as a going concern and in accordance with the delegation of authority from FHFA to our Board of Directors and management. Certain amounts in prior periods’ consolidated financial statements have been reclassified to conform to the current presentation.
	We evaluate the materiality of identified errors in the financial statements using both an income statement, or “rollover,” and a balance sheet, or “iron curtain,” approach, based on relevant quantitative and qualitative factors. Net income includes certain adjustments to correct immaterial errors related to previously reported periods.
Reclassification	Beginning in the first quarter of 2014, we reclassified net discounts paid on retirements of other debt and net premiums received from issuance of debt securities of consolidated trusts and other debt from cash flows from operating activities to cash flows from financing activities on our consolidated statements of cash flows. This reclassification resulted in a decrease of $2.0 billion and $3.2 billion to net cash provided by operating activities, and an increase of $2.0 billion and $3.2 billion to net cash used in financing activities for 2013 and 2012, respectively.
Use of Estimates	Use of Estimates
	The preparation of financial statements requires us to make estimates and assumptions that affect: (a) the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements; and (b) the reported amounts of revenues and expenses and gains and losses during the reporting period. Management has made significant estimates in preparing the financial statements for establishing the allowance for loan losses and reserve for guarantee losses, valuing financial instruments and other assets and liabilities, assessing impairments on investments, and assessing our ability to realize net deferred tax assets. Actual results could be different from these estimates.
Consolidation and Equity Method of Accounting	Consolidation and Equity Method of Accounting
	The consolidated financial statements include our accounts and those of our subsidiaries. We consolidate entities in which we have a controlling financial interest. All intercompany transactions have been eliminated in consolidation.
	For each entity with which we are involved, we determine whether the entity should be consolidated in our financial statements. The method for determining whether a controlling financial interest exists varies depending on whether the entity is a VIE or non-VIE. A VIE is an entity: (a) that has a total equity investment at risk that is not sufficient to finance its activities without additional subordinated financial support provided by another party; (b) where the group of equity holders does not have: (i) the power, through voting rights or similar rights, to direct the activities of an entity that most significantly impact the entity’s economic performance; (ii) the obligation to absorb the entity’s expected losses; or (iii) the right to receive the entity’s expected residual returns; or (c) where the voting rights of some investors are disproportionate to their obligation to absorb expected losses or their right to expected residual returns (or both) and substantially all of the entity’s activities are conducted on behalf of an investor that has disproportionately few voting rights
	For entities that are not VIEs, the usual condition of a controlling financial interest is ownership of a majority voting interest in an entity. We use the equity method of accounting for entities over which we have the ability to exercise significant influence, but not control.
Consolidation, Variable Interest Entity, Policy [Policy Text Block]	PC Trusts
	We are the primary beneficiary of securitization trusts that issue our single-family PCs and therefore consolidate the assets and liabilities of these trusts at either their: (a) carrying value, if the underlying assets are contributed by us to the trust; or (b) fair value, for those securitization trusts established for our guarantor swap program. Mortgage loans underlying our issued single-family PCs are recognized on our consolidated balance sheets as mortgage loans held-for-investment by consolidated trusts, at amortized cost. The corresponding single-family PCs held by third parties are recognized on our consolidated balance sheets as debt securities of consolidated trusts held by third parties. Refer to “Mortgage Loans” and “Debt Securities Issued” below for further information on the subsequent accounting treatment of these assets and liabilities, respectively.
	REMICs and Other Structured Securities
	Our single-family REMICs and Other Structured Securities use resecuritization trusts and represent beneficial interests in groups of PCs and other types of mortgage-related assets. We create these securities primarily by using PCs or previously issued REMICs and Other Structured Securities as collateral. Similar to our PCs, we guarantee the payment of principal and interest to the holders of the tranches of our REMICs and Other Structured Securities. However, for REMICs and Other Structured Securities where we have already guaranteed the underlying assets, there is no incremental exposure to credit loss assumed by us.
	With respect to the resecuritization trusts used for our single-family REMICs and Other Structured Securities whose underlying assets are PCs or previously issued REMICs and Other Structured Securities, we do not have rights to receive benefits or obligations to absorb losses that could potentially be significant to the trusts because we have already provided a guarantee on the underlying assets. Additionally, our involvement with these trusts does not provide us with any power that would enable us to direct the significant economic activities of these entities. Although we may be exposed to prepayment risk through our ownership of the securities issued by these trusts, we do not have the ability through our involvement with the trust to affect the economic risks to which we are exposed. As a result, we are not the primary beneficiary of, and therefore do not consolidate, the resecuritization trusts used for REMICs and Other Structured Securities whose underlying assets are PCs or previously issued REMICs and Other Structured Securities, unless we hold substantially all of the outstanding beneficial interests that have been issued by the trust.
	We consolidate VIEs in which we hold a controlling financial interest and are therefore deemed to be the primary beneficiary. An enterprise has a controlling financial interest in, and thus is deemed to be the primary beneficiary of, a VIE if it has both: (a) the power to direct the activities of the VIE that most significantly impact its economic performance; and (b) exposure to losses or benefits of the VIE that could potentially be significant to the VIE. We perform ongoing assessments to determine if we are the primary beneficiary of the VIEs with which we are involved and, as such, conclusions may change over time as the nature and extent of our involvement changes.
	We use securitization trusts, which are VIEs, in our securities issuance process. We are the primary beneficiary of trusts that issue our single-family PCs and certain Other Guarantee Transactions. See “NOTE 3: VARIABLE INTEREST ENTITIES” for more information. When we transfer assets into a VIE that we consolidate at the time of the transfer (or shortly thereafter), we recognize the assets and liabilities of the VIE at the amounts that they would have been recognized if they had not been transferred, and no gain or loss is recognized on these transfers. For all other VIEs that we consolidate, we recognize the assets and liabilities of the VIE at fair value, and we recognize a gain or loss for the difference between: (a) the sum of the fair value of the consideration paid, the fair value of any noncontrolling interests held by third parties and the reported amount of any previously held interests; and (b) the net amount, measured on a fair value basis, of the assets and liabilities consolidated.
	Our multifamily Other Structured Securities use securitization trusts that meet the definition of a VIE. Our multifamily Other Structured Securities typically involve our acquisition of tax-exempt multifamily housing revenue bonds, placement of those bonds in a securitization trust, and issuance of tax-exempt senior certificates as well as subordinate certificates that provide structural credit protection. The housing revenue bonds are collateralized by low- and moderate-income multifamily housing developments. We guarantee the principal and interest on the senior certificates and, because the underlying collateral is not already guaranteed by us, we receive a management and guarantee fee.
	Our involvement with the securitization trusts used for our multifamily Other Structured Securities whose underlying assets are multifamily housing revenue bonds does not provide us with power that would enable us to direct the significant economic activities of these entities. As a result, we are not the primary beneficiary of, and therefore do not consolidate, these entities.
	Other Guarantee Transactions
	Other Guarantee Transactions are mortgage-related securities that we issue to third parties in exchange for non-Freddie Mac mortgage-related securities. Other Guarantee Transactions typically involve us purchasing either the senior tranches from a non-Freddie Mac senior-subordinated securitization or single-class pass-through securities, placing the acquired assets into a securitization trust, providing a guarantee of the principal and interest of the acquired assets and issuing securities backed by these assets. To the extent that we are deemed to be the primary beneficiary of such a securitization trust, we recognize the mortgage loans underlying the Other Guarantee Transaction as mortgage loans held-for-investment, at amortized cost. Correspondingly, we recognize the issued securities held by third parties as debt securities of consolidated trusts. However, to the extent we are not deemed to be the primary beneficiary of such a securitization trust, we initially recognize a guarantee asset and a guarantee obligation at fair value to the extent a management and guarantee fee is charged. We do not receive transaction fees, apart from our management and guarantee fee, for these transactions.
	Our primary Other Guarantee Transactions are issuances of multifamily K Certificates. In substantially all of these transactions, we guarantee only the most senior tranches of the securities and our initial involvement with the trusts that issue the K Certificates does not provide us with any power that would enable us to direct the significant economic activities of these entities. As a result, we are not the primary beneficiary of, and therefore do not consolidate, these trusts when K Certificates are initially issued. To the extent that our involvement with the trusts changes, we evaluate whether we have become the primary beneficiary.
Fair Value Measurements	Fair Value Measurements
	Consistent with the accounting guidance for fair value measurements and disclosures, we use a three-level fair value hierarchy that prioritizes the inputs to the valuation techniques used to measure the fair value of assets and liabilities, giving highest priority to quoted prices in active markets and lowest priority to unobservable inputs. Fair value represents the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements under this hierarchy are distinguished among three levels: quoted market prices, observable inputs, and unobservable inputs. We use quoted market prices and valuation techniques that seek to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs. Our inputs are based on the assumptions a market participant would use in valuing the asset or liability. Assets and liabilities are classified in their entirety within the fair value hierarchy based on the lowest level input that is significant to the fair value measurement. When assets and liabilities are transferred between levels, we recognize the transfer as of the beginning of the period. See “NOTE 16: FAIR VALUE DISCLOSURES” for additional information regarding the fair value measurements and the hierarchy.
Securitization Activities through Issuances of Freddie Mac Mortgage-Related Securities	Purchases and Sales of Freddie Mac Mortgage-Related Securities
	PCs
	When we purchase PCs that have been issued by consolidated PC trusts, we extinguish the outstanding debt securities of the related consolidated trust. We recognize a gain (loss) on extinguishment of the debt securities to the extent the amount paid to redeem the debt differs from its carrying value, adjusted for any related purchase commitments accounted for as derivatives.
	When we sell PCs that have been issued by consolidated PC trusts, we recognize a liability to the third-party beneficial interest holders of the related consolidated trust as debt securities of consolidated trusts held by third parties. That is, our sale of PCs issued by consolidated PC trusts is accounted for as the issuance of debt.
	Single-Class REMICs and Other Structured Securities
	The collateral for our single-class REMICs and Other Structured Securities includes PCs and previously issued single-class REMICs and Other Structured Securities. We do not consolidate these resecuritization trusts as we are not deemed to be the primary beneficiary of the trusts. Our single-class REMICs and Other Structured Securities pass through all of the cash flows of the underlying PCs directly to the holders of the securities and are deemed to be substantially the same as the underlying PCs. As a result, when we purchase single-class REMICs and Other Structured Securities, we extinguish a pro rata portion of the outstanding debt securities of the related PC trust on our consolidated balance sheets.
	When we sell single-class REMICs and Other Structured Securities, we recognize a liability to the third-party beneficial interest holders of the related consolidated PC trust as debt securities of consolidated trusts held by third parties. That is, our sale of single-class REMICs and Other Structured Securities is accounted for as the issuance of debt.
	Multiclass REMICs and Other Structured Securities
	The collateral for our single-family multiclass REMICs and Other Structured Securities includes PCs and previously issued REMICs and Other Structured Securities. We do not consolidate most of these resecuritization trusts as we are not deemed to be the primary beneficiary of the trusts unless we hold substantially all of the outstanding beneficial interests that have been issued by the trust. In our single-family multiclass REMICs and Other Structured Securities, the cash flows of the underlying PCs are divided (e.g., stripped and/or time tranched). Due primarily to this division of cash flows, these securities are not deemed to be substantially the same as the underlying PCs. As a result, when we purchase single-family multiclass REMICs and Other Structured Securities, we record these securities as investments in debt securities rather than as the extinguishment of debt since we are investing in the debt securities of a non-consolidated entity. See “Investments in Securities” for further information regarding our accounting for investments in multiclass REMICs and Other Structured Securities.
	We recognize, as assets, both the investment in single-family multiclass REMICs and Other Structured Securities and the mortgage loans backing the PCs held by the trusts which underlie the single-family multiclass REMICs and Other Structured Securities. Additionally, we recognize, as liabilities, the unsecured debt issued to third parties to fund the purchase of the single-family multiclass REMICs and Other Structured Securities as well as the debt issued to third parties of the PC trusts we consolidate which underlie the single-family multiclass REMICs and Other Structured Securities. This results in recognition of interest income from both assets and interest expense from both liabilities.
	The collateral for our multifamily multiclass Other Structured Securities typically includes multifamily housing revenue bonds which are collateralized by low- and moderate-income multifamily housing developments. We do not consolidate the securitization trusts that issue these securities as we are not deemed to be the primary beneficiary of the trusts. When we purchase multifamily multiclass Other Structured Securities, we record them as investments in debt securities. See “Investments in Securities” for further information regarding our accounting for investments in multiclass REMICs and Other Structured Securities.
	When we sell multiclass REMICs and Other Structured Securities in which we are not the primary beneficiary of the resecuritization trust, we account for the transfer in accordance with the accounting guidance for transfers of financial assets. To the extent the transfer of multiclass REMICs and Other Structured Securities qualifies as a sale, we de-recognize all assets sold and recognize all assets obtained and liabilities incurred. Any gain (loss) on the sale of multiclass REMICs and Other Structured Securities is reflected in our consolidated statements of comprehensive income as a component of other gains (losses) on investment securities recognized in earnings. To the extent the transfer of multiclass REMICs and Other Structured Securities does not qualify as a sale, we account for the transfer as a financing transaction and recognize a liability for the proceeds received from third parties in the transfer.
	Securitization Activities through Issuances of Freddie Mac Mortgage-Related Securities
	Overview
	When we securitize mortgages that we purchase, we issue mortgage-related securities such as PCs that can be sold to investors or held by us. We issue mortgage-related securities in the form of PCs, REMICs and Other Structured Securities, and Other Guarantee Transactions. Guarantor swaps are transactions where financial institutions exchange mortgage loans for PCs backed by these mortgage loans. Multilender swaps are similar to guarantor swaps, except that the formed PC pools include loans that are contributed by more than one party. We issue PCs through various swap-based exchanges significantly more often than through cash-based transfers. We issue REMICs and Other Structured Securities in transactions in which securities dealers or investors sell us mortgage-related assets in exchange for REMICs and Other Structured Securities. We also issue Other Guarantee Transactions to third parties in exchange for non-Freddie Mac mortgage-related securities.
	PCs
	Our PCs are pass-through debt securities that represent undivided beneficial interests in a pool of mortgages held by a securitization trust. For our fixed-rate PCs, we guarantee the timely payment of interest and principal. For our ARM PCs, we guarantee the timely payment of the weighted average coupon interest rate for the underlying mortgage loans. We do not guarantee the timely payment of principal for ARM PCs; however, we do guarantee the full and final payment of principal.
	In return for providing our guarantee of the payment of principal and interest, we earn a management and guarantee fee that is paid to us over the life of an issued PC, representing a portion of the interest collected on the underlying loans.
Revenue Recognition, Multiple-deliverable Arrangements, Description [Policy Text Block]	We receive a transaction fee from third parties for issuing our single-family REMICs and Other Structured Securities whose underlying assets are PCs or previously issued REMICs and Other Structured Securities. We defer the portion of the transaction fee that is equal to the estimated value of our future administrative responsibilities for these issued REMICs and Other Structured Securities. These responsibilities include ongoing trustee services, administration of pass-through amounts, paying agent services, tax reporting, and other required services. We estimate the value of these future responsibilities based on quotes from third-party vendors who perform each type of service and, where quotes are not available, based on our estimates of what those vendors would charge. The remaining portion of the transaction fee relates to compensation earned in connection with structuring-related services we rendered to third parties and is allocated between REMICs and Other Structured Securities we retain, if any, and the REMICs and Other Structured Securities acquired by third parties, based on the relative fair value of the securities. The portion of the fee allocated to any REMICs and Other Structured Securities we retain is deferred as a carrying value adjustment and is amortized into interest income using the effective interest method over the contractual lives of these securities. The fee allocated to REMICs and Other Structured Securities acquired by third parties is recognized immediately in earnings as other income.
Other Guarantee Commitments	Other Guarantee Commitments
	In certain circumstances, we also provide a guarantee of mortgage-related assets held by third parties, in exchange for a guarantee fee, without securitizing those assets. For example, we provide long-term standby commitments to certain of our single-family customers, which obligate us to purchase seriously delinquent loans that are covered by those commitments. We also provide guarantee commitments on multifamily housing revenue bonds that were issued by HFAs as well as guarantees under the TCLFP on securities backed by HFA bonds.
Cash and Cash Equivalents	Cash and Cash Equivalents
	Highly liquid investment securities that have an original maturity of three months or less are accounted for as cash equivalents. In addition, cash collateral that we have the right to use for general corporate purposes and that we obtain from counterparties to derivative contracts is recorded as cash and cash equivalents.
Restricted Cash and Cash Equivalents	Restricted Cash and Cash Equivalents
	Cash collateral accepted from counterparties that we do not have the right to use for general corporate purposes is recorded as restricted cash in our consolidated balance sheets. Restricted cash includes cash remittances received on the underlying assets of our consolidated trusts, which are deposited into a separate custodial account. We invest the cash held in the custodial account in short-term investments and are entitled to the interest income earned on these short-term investments, which is recorded as interest income, other on our consolidated statements of comprehensive income.
Mortgage Loans	Mortgage Loans
	Upon acquisition, we classify a loan as either held-for-sale or held-for-investment. Mortgage loans that we have the ability and intent to hold for the foreseeable future are classified as held-for-investment. Loans we acquire and which we intend to securitize using an entity we will consolidate will be classified as held-for-investment both prior to and subsequent to their securitization, in accordance with our intent and ability to hold such loans for the foreseeable future.
	Held-for-investment mortgage loans are reported in our consolidated balance sheets at their outstanding UPB, net of deferred fees and other cost basis adjustments (including unamortized premiums and discounts, delivery fees and other pricing adjustments). These deferred items are amortized into interest income over the contractual lives of the loans using the effective interest method. We recognize interest income on an accrual basis except when we believe the collection of principal and interest in full is not reasonably assured. If the collection of principal and interest in full is not reasonably assured, we cease the accrual of interest income and any interest income accrued but uncollected is reversed.
	Mortgage loans not classified as held-for-investment are classified as held-for-sale. Held-for-sale loans are reported at lower-of-cost-or-fair-value on our consolidated balance sheets. Any excess of a held-for-sale loan’s cost over its fair value is recognized as a valuation allowance in other income on our consolidated statements of comprehensive income, with changes in this valuation allowance also being recorded in other income. Premiums, discounts, and other cost basis adjustments recognized upon acquisition on single-family loans classified as held-for-sale are deferred and not amortized. We elected the fair value option for multifamily mortgage loans held for sale that we intend to securitize and sell to investors. See “NOTE 16: FAIR VALUE DISCLOSURES — Fair Value Option — Multifamily Held-For-Sale Mortgage Loans” and “NOTE 16: FAIR VALUE DISCLOSURES — Fair Value Option — Changes in Fair Value under the Fair Value Option Election.” Thus, these multifamily mortgage loans are measured at fair value on a recurring basis, with subsequent gains or losses related to changes in fair value reported in other income in our consolidated statements of comprehensive income.
	Cash flows related to mortgage loans originally classified as held-for-investment are classified as either investing activities (e.g., principal repayments) or operating activities (e.g., interest payments received from borrowers included within net income (loss)). Cash flows related to mortgage loans originally classified as held-for-sale are classified in operating activities.
Non-Accrual Loans	Non-Accrual Loans
	We place mortgage loans on non-accrual status when we believe collectability of principal and interest in full is not reasonably assured, which generally occurs when a loan is three monthly payments past due, unless the loan is well secured and in the process of collection based upon an individual loan assessment. A loan is considered past due if a full payment of principal and interest is not received within one month of its due date. When a loan is placed on non-accrual status, any interest income accrued but uncollected is reversed. Thereafter, interest income is recognized only upon receipt of cash payments.
	A non-accrual mortgage loan may be returned to accrual status when the collectability of principal and interest in full is reasonably assured. For single-family loans, we determine that collectability is reasonably assured when we have received payment of principal and interest such that the loan becomes less than three monthly payments past due. For multifamily loans, the collectability of principal and interest is considered reasonably assured based on a quantitative and qualitative analysis of the factors specific to the loan being assessed. Upon a loan’s return to accrual status, all previously reversed interest income is recognized and amortization of any basis adjustments into interest income is resumed.
Allowance for Loan Losses and Reserve for Guarantee Losses	Allowance for Loan Losses and Reserve for Guarantee Losses
	The allowance for loan losses and the reserve for guarantee losses represent estimates of probable incurred credit losses. The allowance for loan losses pertains to all single-family and multifamily loans classified as held-for-investment on our consolidated balance sheets whereas the reserve for guarantee losses relates to single-family and multifamily loans underlying our non-consolidated Freddie Mac mortgage-related securities and other guarantee commitments. Total held-for-investment mortgage loans, net are shown net of the allowance for loan losses on our consolidated balance sheets. The reserve for guarantee losses is included within other liabilities on our consolidated balance sheets. Collectively, we refer to our allowance for loan losses and our reserve for guarantee losses as our loan loss reserves. We recognize probable incurred losses by recording a charge to the provision for credit losses in our consolidated statements of comprehensive income. Determining the appropriateness of the loan loss reserves is a complex process that is subject to numerous estimates and assumptions requiring significant judgment about matters that involve a high degree of subjectivity.
	We estimate credit losses related to homogeneous pools of loans in accordance with the accounting guidance for contingencies. Accordingly, we maintain an allowance for loan losses on mortgage loans held-for-investment when it is probable that a loss has been incurred and the amount of the loss can be reasonably estimated. Loans that we evaluate for individual impairment are measured in accordance with the accounting guidance for receivables. For more information, refer to “Impaired Loans” below.
	For both the single-family and multifamily portfolios, we charge off (in full or in part) our recorded investment in a loan in the period it is determined that the loan (or a portion thereof) is uncollectible, which generally occurs at final disposition of the loan through foreclosure or other loss event. However, if losses are evident prior to final disposition, earlier recognition of a charge-off is required by our policies. A charge-off is also recorded if we realize a specific credit loss upon the modification of a loan in a TDR. We do not have any established threshold in terms of days past due beyond which we partially or fully charge-off loans.
	Single-Family Loans
	We determine single-family loan loss reserves both on a collective and individual basis. For further discussion on individually impaired single-family loans, refer to “Impaired Loans” below.
	We estimate loan loss reserves on homogeneous pools of single-family loans using a statistically based model that evaluates a variety of factors affecting collectability. The homogeneous pools of single-family mortgage loans are determined based on common underlying characteristics, including estimated current LTV ratios, trends in home prices, loan product type, and geographic region. In determining the loan loss reserves for single-family loans at the balance sheet date, we evaluate key inputs and factors including, but not limited to:
	•	estimated current LTV ratios and historical trends in home prices;
	•	loan product type;
	•	delinquency/default status and history;
	•	actual and estimated rates of collateral loss severity for similar loans;
	•	geographic location;
	•	loan age;
	•	sourcing channel;
	•	occupancy type;
	•	UPB at origination;
	•	expected ability to partially mitigate losses through loan modification or other alternatives to foreclosure;
	•	expected proceeds from mortgage insurance contracts that are contractually attached to a loan or other credit enhancements that were entered into contemporaneously with and in contemplation of a guarantee or loan purchase transaction;
	•	expected repurchases of mortgage loans by seller/servicers;
	•	counterparty credit of mortgage insurers and seller/servicers;
	•	pre-foreclosure real estate taxes and insurance;
	•	estimated selling costs should the underlying property ultimately be sold; and
	•	trends in the timing of foreclosures.
	For additional information on estimated current LTV ratios and single-family loan loss reserves, see “NOTE 4: MORTGAGE LOANS AND LOAN LOSS RESERVES — Credit Quality of Mortgage Loans.”
	We rely upon third-parties to provide primary servicing for the performing and non-performing loan portfolios. At loan delivery, the seller provides us with the loan data, which includes loan characteristics and underwriting information. Each month, the servicers provide us with monthly loan level servicing data, including delinquency and loss information.
	Certain loan servicing data is reported to us on a real-time basis, such as loan pay-offs and foreclosure events. However, certain monthly servicing data, including delinquency status, is delivered on a one-month delay. For example, December loan delinquency data delivered to us at the end of December or beginning of January reflects the loan delinquency status related to the December 1 payment cycle. We incorporate the delinquency status data into our allowance for loan loss calculation generally without adjustment for the one-month delay.
	Our single-family loan loss reserve default models are estimated based on 12 months of actual loan performance data, including loan status and delinquency data reported by our servicers. The loan performance data provides a loan level history of delinquency, foreclosures, foreclosure alternatives and modifications. Our single-family loan loss reserve severity is based on the repeat housing sales index and actual REO dispositions, short sale and third-party values that incorporates the most recent: (a) six months of sales experience realized on our distressed property dispositions; and (b) twelve months of pre-foreclosure expenses on our distressed properties including REO, short sales, and third-party sales. Our single-family loan loss severity estimate also captures current business area practices and expectations about recoveries from mortgage insurance or due to seller/servicer repurchases. We use historical trends in home prices in our single-family loan loss reserve process, primarily through the use of estimated current total LTV ratios in our default models and through the use of recent home price sales experience in our severity estimate. However, we do not use a forecast of trends in home prices in our single-family loan loss reserve process. See endnote (1) to “Table 4.2 — Recorded Investment of Held-for-Investment Mortgage Loans, by LTV Ratio” for more information about the repeat housing sales index.
	Our loan loss reserves reflect our best current estimates of incurred losses. Our loan loss reserve estimate includes projections related to loss mitigation activities, including loan modifications for troubled borrowers, and projections of recoveries through repurchases by seller/servicers of defaulted loans due to failure to follow contractual underwriting requirements at the time of the loan origination. These projections are based on our recent historical experience and current business practices and require significant management judgment. We monitor our projections of recoveries through seller/servicer repurchases to ensure that these projections are reasonable and consistent with our assessment of the credit capacity of our seller/servicer counterparties. For loans where foreclosure is probable, impairment is measured based upon an estimate of the fair value of the underlying collateral less estimated disposition costs. Our estimate also considers the effect of historical home price changes on borrower behavior.
	Our reserve estimate also reflects our best projection of defaults we believe are likely to occur as a result of loss events that have occurred through December 31, 2014 and 2013, respectively. However, fluctuations in the U.S. housing market, the uncertainty in other macroeconomic factors, and variations in success rates of modification efforts under HAMP and other loan workout programs, make estimating loss events inherently imprecise.
	We validate and update our models and factors to capture changes in actual loss experience, as well as the effects of changes in underwriting practices and in our loss mitigation strategies. We also consider macroeconomic and other factors that impact the quality of the loans underlying our portfolio including regional housing trends, applicable home price indices, unemployment and employment dislocation trends, the effects of changes in government policies and programs, consumer credit statistics, and the extent of third-party insurance. We consider our assessment of these factors in determining our loan loss reserves.
	We apply proceeds from primary mortgage insurance that is contractually attached to a loan and from other credit enhancements, including repurchase recoveries, entered into contemporaneously with and in contemplation of a guarantee or loan purchase transaction, as a recovery of our recorded investment in a charged-off loan, up to the amount of loss recognized as a charge-off. Proceeds received in excess of our recorded investment in charged-off loans are recorded as a decrease to REO operations expense in our consolidated statements of comprehensive income. We record receivables for proceeds from primary mortgage insurance and other credit enhancements, including repurchase recoveries, when the proceeds are estimable and collectability is reasonably assured. We generally accrue receivables for primary mortgage insurance, pool insurance, and most other types of credit enhancements at the time of final disposition of the loan as we have a history of collection of these types of recoveries and the amounts are estimable based on the contractual terms of the agreements. However, due to the uncertainty of the timing and amount of collections of repurchase recoveries, we generally do not accrue receivables for repurchase recoveries and instead record repurchase recoveries received on a cash basis.
	Multifamily Loans
	For multifamily loans identified as impaired, we individually determine the loan loss reserves. Refer to “Impaired Loans” below for further discussion on individually impaired multifamily loans. Multifamily loans evaluated collectively for impairment are aggregated into book year vintages and measured by benchmarking published historical commercial mortgage data to those vintages based upon available economic data related to multifamily real estate, including apartment vacancy and rental rates.
Impaired Loans	Impaired Loans
	We consider a loan to be impaired when it is probable, based on current information, that we will not receive all amounts due (including both principal and interest) in accordance with the contractual terms of the original loan agreement. Delays in the timing of our expected receipt of these amounts that are more than insignificant are considered in making this assessment.
	Single-Family Loans
	Individually impaired single-family loans primarily include loans that have undergone a TDR. These loans are measured individually for impairment as discussed below in "Troubled Debt Restructurings." If we determine that foreclosure on the underlying collateral is probable, we measure impairment based upon the fair value of the collateral, as reduced by estimated disposition costs and adjusted for estimated proceeds from insurance and similar sources.
	Multifamily Loans
	Multifamily impaired loans include TDRs, loans three monthly payments or more past due, and loans that are deemed impaired based on management judgment. Factors considered by management in determining whether a loan is impaired include, but are not limited to, the underlying property’s operating performance as represented by its current DSCR, available credit enhancements, estimated current LTV ratio, management of the underlying property, and the property’s geographic location.
	Multifamily loans are generally measured individually for impairment based on the fair value of the underlying collateral, as reduced by estimated disposition costs, as the repayment of these loans is generally provided from the cash flows of the underlying collateral and any associated credit-enhancement. Except for cases of fraud and certain other types of borrower defaults, most multifamily loans are non-recourse to the borrower. As a result, the cash flows of the underlying property (including any associated credit enhancements) serve as the source of funds for repayment of the loan. Interest income recognition on multifamily impaired loans is subject to our non-accrual policy as discussed in “Mortgage Loans — Non-Accrual Loans.”
Troubled Debt Restructurings	Troubled Debt Restructurings
	Single-family and multifamily loans which experience a modification to their contractual terms which results in a concession being granted to a borrower experiencing financial difficulties are considered TDRs. A concession is deemed granted when, as a result of the restructuring, we do not expect to collect all amounts due, including interest accrued, at the original contractual interest rate. As appropriate, we also consider other qualitative factors in determining whether a concession is deemed granted, including whether the borrower’s modified interest rate is consistent with that of a non-troubled borrower. We do not consider restructurings that result in a delay in payment that is insignificant to be a concession. We generally consider a delay in monthly amortizing payments of three months or less to be insignificant. We generally consider all other delays to be more than insignificant. A concession typically includes one or more of the following being granted to the borrower: (a) a trial period where the expected permanent modification will change our expectation of collecting all amounts due at the original contract rate; (b) a delay in payment that is more than insignificant; (c) a reduction in the contractual interest rate; (d) interest forbearance for a period of time that is not insignificant or forgiveness of accrued but uncollected interest amounts; (e) principal forbearance that is more than insignificant or a reduction in the principal amount of the loan; and (f) discharge of the borrower’s obligation in Chapter 7 bankruptcy.
	Impairment of a loan having undergone a TDR is generally measured as the excess of our recorded investment in the loan over the present value of the expected future cash flows, discounted at the loan’s original effective interest rate for fixed-rate loans or at the loan’s effective interest rate prior to the restructuring for ARM loans. Our expectation of future cash flows incorporates, among other items, an estimated probability of default which is based on a number of market factors as well as the characteristics of the loan, such as past due status. Subsequent to the restructuring date, interest income is recognized at the modified interest rate, subject to our non-accrual policy as discussed in “Mortgage Loans — Non-Accrual Loans” above, with all other changes in the present value of expected future cash flows being recognized as a component of the provision for credit losses in our consolidated statements of comprehensive income.
Investments in Securities	Investments in Securities
	Investments in securities consist primarily of mortgage-related securities. We classify securities as “available-for-sale” or “trading.” As of December 31, 2014 and 2013, we did not classify any securities as “held-to-maturity,” although we may elect to do so in the future. Securities classified as available-for-sale and trading are reported at fair value with changes in fair value included in AOCI and other gains (losses) on investment securities recognized in earnings, respectively. See “NOTE 16: FAIR VALUE DISCLOSURES” for more information on how we determine the fair value of securities.
	We elected the fair value option for certain available-for-sale mortgage-related securities, including investments in securities that: (a) can contractually be prepaid or otherwise settled in such a way that we may not recover substantially all of our initial recorded investment; or (b) are not of high credit quality at the acquisition date and are identified as within the scope of the accounting guidance for investments in beneficial interests in securitized financial assets. These securities are classified as trading securities. By electing the fair value option for these instruments, we reflect valuation changes through our consolidated statements of comprehensive income in the period they occur. For additional information on our election of the fair value option, see “NOTE 16: FAIR VALUE DISCLOSURES.”
	We record purchases and sales of securities that are exempt from the accounting guidance for derivatives and hedge accounting on a trade date basis. Securities underlying forward purchases and sales contracts that are not exempt from the requirements of derivatives and hedge accounting are recorded on the expected settlement date with a corresponding commitment recorded on the trade date.
	For most of our investments in securities, interest income is recognized using the effective interest method. Deferred items, including premiums, discounts, and other basis adjustments, are amortized into interest income over the contractual lives of the securities.
	For certain investments in securities, interest income is recognized using the prospective effective interest method. We specifically apply this accounting to beneficial interests in securitized financial assets that: (a) can contractually be prepaid or otherwise settled in such a way that we may not recover substantially all of our recorded investment; (b) are not of high credit quality at the acquisition date; or (c) have been determined to be other-than-temporarily impaired. We recognize as interest income (over the life of these securities) the excess of all estimated cash flows attributable to these interests over their book value using the effective interest method. We update our estimates of expected cash flows periodically and recognize changes in the calculated effective interest rate on a prospective basis.
	We evaluate available-for-sale securities in an unrealized loss position as of the end of each quarter for other-than-temporary impairment. An unrealized loss exists when the fair value of an individual security is less than its amortized cost basis. As discussed further below, certain other-than-temporary impairment losses are recognized in earnings.
	If we intend to sell the security or believe it is more likely than not that we will be required to sell the security prior to recovery of its amortized cost basis, the security’s entire decline in fair value is deemed to be other-than-temporary and is recorded within our consolidated statements of comprehensive income as net impairment of available-for-sale securities recognized in earnings. If we do not intend to sell the security and we believe it is not more likely than not that we will be required to sell prior to recovery of the security’s unrealized loss, we recognize only the credit component of other-than-temporary impairment in earnings and the amounts attributable to all other factors are recorded in AOCI. The credit component represents the amount by which the present value of cash flows expected to be collected from the security is less than the amortized cost basis of the security. The present value of expected future cash flows represents our estimate of future contractual cash flows that we expect to collect, discounted at the original effective interest rate or the effective interest rate determined based on significantly improved cash flows subsequent to initial impairment.
	The evaluation of whether unrealized losses on available-for-sale securities are other-than-temporary requires significant management judgments and assumptions and consideration of numerous factors. We perform an evaluation on a security-by-security basis considering all available information. The relative importance of this information varies based on the facts and circumstances surrounding each security, as well as the economic environment at the time of assessment. For information regarding important factors, judgments and assumptions, see “NOTE 7: INVESTMENTS IN SECURITIES — Impairment Recognition on Investments in Securities.”
	Gains and losses on the sale of securities are included in other gains (losses) on investment securities recognized in earnings, including those gains (losses) reclassified into earnings from AOCI. We use the specific identification method for determining the cost basis of a security in computing the gain or loss.
	For securities classified as trading or available-for-sale, we classify the cash flows as investing activities because we hold these securities for investment purposes. In cases where the transfer of available-for-sale securities represents a secured borrowing, we classify the related cash flows as financing activities.
Repurchase and Resale Agreements and Dollar Roll Transactions	Repurchase and Resale Agreements and Dollar Roll Transactions
	We enter into repurchase and resale agreements primarily as an investor or to finance certain of our security positions. Such transactions are accounted for as secured financings because the transferor does not relinquish control over the transferred assets.
	We also engage in dollar roll transactions whereby we enter into an agreement to sell and subsequently repurchase (or purchase and subsequently resell) agency securities. When these transactions involve securities issued by consolidated entities, they are treated as issuances and extinguishments of debt. When these transactions involve securities issued by entities we do not consolidate, they are treated as purchases and sales as the security initially transferred is not required to be the same or substantially the same as the security subsequently returned.
Debt Securities Issued	Debt Securities Issued
	Debt securities that we issue are classified on our consolidated balance sheets as either debt securities of consolidated trusts held by third parties or other debt. The debt securities of our consolidated trusts are prepayable without penalty at any time. Other debt represents short-term and long-term debt securities that we issue to third parties to fund our general business activities.
	Both debt of our consolidated trusts and other debt, except for certain debt for which we elected the fair value option, are reported at amortized cost. Deferred items, including premiums, discounts, and hedging-related basis adjustments are reported as a component of total debt, net. Issuance costs are reported as a component of other assets. These items are amortized and reported through interest expense using the effective interest method over the contractual life of the related indebtedness. Amortization of premiums, discounts, and issuance costs begins at the time of debt issuance. Amortization of hedging-related basis adjustments begins upon the discontinuation of the related hedge relationship.
	We elected the fair value option on certain debt securities of consolidated trusts held by third parties and certain other debt. The change in fair value for debt recorded at fair value is reported as other income in our consolidated statements of comprehensive income. For debt where we have elected the fair value option, upfront costs and fees are recognized in earnings as incurred and not deferred. For additional information on our election of the fair value option, see “NOTE 16: FAIR VALUE DISCLOSURES.”
	When we repurchase or call outstanding debt securities, we recognize a gain or loss related to the difference between the amount paid to redeem the debt security and the carrying value in earnings as a component of gains (losses) on retirement of other debt. Contemporaneous transfers of cash between us and a creditor in connection with the issuance of a new debt security and satisfaction of an existing debt security are accounted for as either an extinguishment or a modification of an existing debt security. If the debt securities have substantially different terms, the transaction is accounted for as an extinguishment of the existing debt security. The issuance of a new debt security is recorded at fair value, fees paid to the creditor are expensed as incurred and fees paid to third parties are deferred and amortized into interest expense over the life of the new debt security using the effective interest method. If the terms of the existing debt security and the new debt security are not substantially different, the transaction is accounted for as a modification of the existing debt. Fees paid to the creditor are deferred and amortized into interest expense over the life of the modified unsecured debt security using the effective interest method and fees paid to third parties are expensed as incurred.
	Cash flows related to debt securities issued by our consolidated trusts are classified as either financing activities (e.g., repayment of principal to PC holders) or operating activities (e.g., interest payments to PC holders included within net income (loss)). Other than interest paid, cash flows related to other debt are classified as financing activities. Interest paid on other debt is classified as operating activities.
Derivatives	Derivatives
	Derivatives are reported at their fair value on our consolidated balance sheets. Derivatives in a net asset position, including net derivative interest receivable or payable, are reported as derivative assets, net. Similarly, derivatives in a net liability position, including net derivative interest receivable or payable, are reported as derivative liabilities, net. We offset fair value amounts recognized for the right to reclaim cash collateral or the obligation to return cash collateral against fair value amounts recognized for derivative instruments executed with the same counterparty under a master netting agreement. Changes in fair value and interest accruals on derivatives are recorded as derivative gains (losses) in our consolidated statements of comprehensive income. Non-cash collateral held is not recognized on our consolidated balance sheets as we do not obtain effective control over the collateral, and non-cash collateral posted is not de-recognized from our consolidated balance sheets as we do not relinquish effective control over the collateral. Therefore, non-cash collateral held or posted is not presented as an offset against derivative assets or derivative liabilities on our consolidated balance sheets.
	We evaluate whether financial instruments that we purchase or issue contain embedded derivatives. We elected to measure newly acquired or issued financial instruments that contain embedded derivatives at fair value, with changes in fair value recorded in our consolidated statements of comprehensive income.
	At December 31, 2014 and 2013, we did not have any derivatives in hedge accounting relationships; however, there are amounts recorded in AOCI related to discontinued cash flow hedges which are recognized in earnings when the originally forecasted transactions affect earnings. If it becomes probable the originally forecasted transaction will not occur, the associated deferred gain or loss in AOCI would be reclassified to earnings immediately.
	In the consolidated statements of cash flows, cash flows related to the acquisition and termination of derivatives, other than forward commitments, are generally classified in investing activities. Cash flows related to forward commitments are classified within the section of the consolidated statements of cash flows in accordance with the cash flows of the financial instruments to which they relate.
REO	REO
	REO is initially recorded at fair value less costs to sell and is subsequently carried at the lower of cost or fair value less costs to sell. When we acquire REO, losses arise when the recorded investment in the loan (including accrued interest) exceeds the fair value of the foreclosed property, net of estimated costs to sell and expected recoveries through credit enhancements. Losses are charged off against the allowance for loan losses at the time of REO acquisition. REO gains arise and are recognized immediately in earnings when the fair value of the foreclosed property less costs to sell plus expected recoveries through credit enhancements exceeds the recorded investment in the loan (including all amounts due from the borrower).
	Amounts we expect to receive from third-party insurance (primary mortgage insurance and pool insurance) and most other credit enhancements are recorded as receivables when REO is acquired. The receivable is adjusted when the actual claim is filed and is reported as a component of other assets on our consolidated balance sheets. We do not record receivables for repurchase recoveries. We record these on a cash basis due to uncertainty of the timing and amount of collections.
	Material development and improvement costs relating to REO are capitalized. Operating expenses specifically identifiable with an REO property are included in REO operations income (expense) in our consolidated statements of comprehensive income; all other expenses are recognized within other administrative expenses in our consolidated statements of comprehensive income. Declines in the fair value of REO are provided for and charged to REO operations income (expense). Any gains and losses from REO dispositions are included in REO operations income (expense).
Income Taxes	Income Taxes
	We use the asset and liability method of accounting for income taxes for financial reporting purposes. Under this method, deferred tax assets and liabilities are recognized based upon the expected future tax consequences of existing temporary differences between the financial reporting and the tax reporting basis of assets and liabilities using enacted statutory tax rates as well as tax net operating loss and tax credit carryforwards. To the extent tax laws change, deferred tax assets and liabilities are adjusted, when necessary, in the period that the tax change is enacted. Valuation allowances are recorded to reduce net deferred tax assets when it is more likely than not that all or part of our tax benefits will not be realized. The realization of these net deferred tax assets is dependent upon the generation of sufficient taxable income from current operations and from unrecognized tax benefits.
	Income tax benefit (expense) includes: (a) deferred tax benefit (expense), which represents the net change in the deferred tax asset or liability balance during the year plus any change in a valuation allowance; and (b) current tax benefit (expense), which represents the amount of tax currently payable to or receivable from a tax authority including any related interest and penalties plus amounts accrued for unrecognized tax benefits (also including any related interest and penalties). Income tax benefit (expense) excludes the tax effects related to adjustments recorded to equity, such as unrealized gains and losses related to available-for-sale securities.
	Regarding tax positions taken or expected to be taken (and any associated interest and penalties), we recognize a tax position so long as it is more likely than not that it will be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. We measure the tax position at the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement. See “NOTE 12: INCOME TAXES” for additional information.
Earnings Per Common Share	Earnings Per Common Share
	The August 2012 amendment to the Purchase Agreement changed the manner in which the dividend on the senior preferred stock is determined. For each quarter from January 1, 2013 through and including December 31, 2017, the dividend payment will be the amount, if any, by which our Net Worth Amount at the end of the immediately preceding fiscal quarter, less the applicable Capital Reserve Amount, exceeds zero. See "NOTE 11: STOCKHOLDERS' EQUITY — Senior Preferred Stock" for additional information regarding the Capital Reserve Amount. For each quarter beginning January 1, 2018, the dividend payment will be the amount, if any, by which our Net Worth Amount at the end of the immediately preceding fiscal quarter exceeds zero. The dividend is presented in the period in which it is determinable for the senior preferred stock as a reduction to net income (loss) available to common stockholders and net income (loss) per common share. The dividend is declared and paid in the following period and recorded as a reduction to equity in the period declared.
	We have participating securities related to options and restricted stock units with dividend equivalent rights that receive dividends as declared on an equal basis with common shares but are not obligated to participate in undistributed net losses. These participating securities consist of: (a) vested options to purchase common stock; and (b) vested and unvested restricted stock units that earn dividend equivalents at the same rate when and as declared on common stock. Consequently, in accordance with accounting guidance, we use the “two-class” method of computing earnings per common share. The “two-class” method is an earnings allocation formula that determines earnings per share for common stock and participating securities based on dividends declared and participation rights in undistributed earnings.
	Basic earnings per common share is computed as net income attributable to common stockholders divided by the weighted average common shares outstanding for the period. The weighted average common shares outstanding for the period includes the weighted average number of shares that are associated with the warrant for our common stock issued to Treasury pursuant to the Purchase Agreement. These shares are included since the warrant is unconditionally exercisable by the holder at a minimal cost. See “NOTE 2: CONSERVATORSHIP AND RELATED MATTERS” for further information.
	Diluted earnings per common share is computed as net income attributable to common stockholders divided by the weighted average common shares outstanding during the period adjusted for the dilutive effect of common equivalent shares outstanding. For periods with net income attributable to common stockholders, the calculation includes the effect of the following common stock equivalent shares outstanding: (a) weighted average shares related to stock options if the average market price during the period exceeds the exercise price; and (b) the weighted-average of unvested restricted stock units. During periods in which a net loss attributable to common stockholders has been incurred, potential common equivalent shares outstanding are not included in the calculation because it would have an antidilutive effect. See “NOTE 11: STOCKHOLDERS’ EQUITY — Stock-Based Compensation” for additional information on our earnings-per-share calculation.
Comprehensive Income	Comprehensive Income
	Comprehensive income includes all changes in equity during a period, except those resulting from investments by stockholders. We define comprehensive income as consisting of net income (loss) plus after-tax changes in: (a) the unrealized gains and losses on available-for-sale securities; (b) the effective portion of derivatives accounted for as cash flow hedge relationships; and (c) defined benefit plans.
Recently Adopted or Issued Accounting Guidance	Recent Accounting Guidance
	The following table provides a brief description of recent accounting pronouncements that could affect our financial statements.
	Standard	Description	Date of Adoption	Effect on the financial statements
	Recently Adopted Accounting Guidance
	ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects (Topic 323)	The amendment permits entities to elect to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met.	1-Jan-14	The adoption of this amendment did not have a material impact on our consolidated financial statements.
	ASU 2011-04, Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs (Topic 820)	This amendment provided: (a) clarification about the application of existing fair value measurement and disclosure requirements; and (b) changes to the guidance for measuring fair value and disclosing information about fair value measurements.	1-Jan-12	The adoption of this amendment did not have a material impact on our consolidated financial statements.
	ASU 2011-03, Reconsideration of Effective Control for Repurchase Agreements (Topic 860)	This amendment removed the criterion related to collateral maintenance from the transferor’s assessment of effective control. It focuses the assessment of effective control on the transferor’s rights and obligations with respect to the transferred financial assets and not whether the transferor has the practical ability to perform in accordance with those rights or obligations.	1-Jan-12	The adoption of this amendment did not have a material impact on our consolidated financial statements.
	Recently Issued Accounting Guidance, Not Yet Adopted Within our Consolidated Financial Statements
	ASU 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (Topic 310)	The amendment clarifies that a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either: (a) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure; or (b) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement.	1-Jan-15	We do not expect that the adoption of this amendment will have a material impact on our consolidated financial statements.
	ASU 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures (Topic 860)	The amendment requires repurchase-to-maturity transactions to be accounted for as secured borrowings and requires separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty.	1-Jan-15	We do not expect that the adoption of this amendment will have a material impact on our consolidated financial statements.
	ASU 2014-09, Revenue from Contracts with Customers (Topic 606)	The amendment requires entities to recognize revenue to depict the transfer of promised goods or services to customers in amounts that reflect the consideration to which the entity expects to be entitled in exchange for those goods or services.	1-Jan-17	We are evaluating the impact that the adoption of this amendment will have on our consolidated financial statements
	ASU 2014-14, Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure (Topic 310)	The amendment requires that a mortgage loan be de-recognized and a separate receivable be recognized upon foreclosure if certain conditions are met. If those conditions are met and such a receivable is recognized, the receivable should be measured based on the amount of principal and interest related to the loan expected to be recovered from the guarantor.	1-Jan-15	We do not expect that the adoption of this amendment will have a material impact on our consolidated financial statements.

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Table - Variable Interests in VIEs for Which We are not the Primary Beneficiary	Table 3.1 — Variable Interests in VIEs for which We are not the Primary Beneficiary
		31-Dec-14
		Mortgage-Related						Unsecuritized
		Security Trusts						Multifamily
		Freddie  Mac			Non-Freddie Mac			Loans (3)			Other(2)
		Securities(1)			Securities(2)
		(in millions)
	Assets and Liabilities Recorded on our Consolidated Balance Sheets
	Assets:
	Restricted cash and cash equivalents	$	—		$	—		$	—		$	3
	Investments in securities:
	Available-for-sale, at fair value	39,099			65,253			—			—
	Trading, at fair value	17,469			6,282			—			—
	Mortgage loans:
	Held-for-investment, unsecuritized	—			—			40,753			—
	Held-for-sale	—			—			12,368			—
	Accrued interest receivable	236			165			221			7
	Other assets	914			2			369			495
	Liabilities:
	Derivative liabilities, net	—			—			—			(30		)
	Other liabilities	(1,005		)	—			(10		)	(560		)
	Maximum Exposure to Loss	$	87,529		$	69,206		$	53,711		$	10,419
	Total Assets of Non-Consolidated VIEs(4)	$	103,253		$	390,515		$	95,874		$	22,855
		December 31, 2013
		Mortgage-Related						Unsecuritized
		Security Trusts						Multifamily
		Freddie Mac			Non-Freddie Mac			Loans(3)			Other(2)
		Securities(1)			Securities(2)
		(in millions)
	Assets and Liabilities Recorded on our Consolidated Balance Sheets
	Assets:
	Restricted cash and cash equivalents	$	6		$	—		$	8		$	58
	Investments in securities:
	Available-for-sale, at fair value	40,659			84,765			—			—
	Trading, at fair value	9,349			7,414			—			—
	Mortgage loans:
	Held-for-investment, unsecuritized	—			—			50,306			—
	Held-for-sale	—			—			8,727			—
	Accrued interest receivable	232			226			261			7
	Other assets	833			14			407			477
	Liabilities:
	Derivative liabilities, net	(3		)	—			—			(35		)
	Other liabilities	(875		)	(2		)	(12		)	(558		)
	Maximum Exposure to Loss	$	72,072		$	92,559		$	59,710		$	10,415
	Total Assets of Non-Consolidated VIEs(4)	$	84,731		$	506,699		$	105,120		$	23,707
	-1	Freddie Mac securities include our variable interests in single-family multiclass REMICs and Other Structured Securities, multifamily PCs, multifamily Other Structured Securities, and Other Guarantee Transactions that we do not consolidate. Our maximum exposure to loss includes guaranteed UPB of assets held by the non-consolidated VIEs related to multifamily PCs, multifamily Other Structured Securities, and Other Guarantee Transactions. Our maximum exposure to loss on Freddie Mac securities excludes investments in single-family multiclass REMICs and Other Structured Securities, because we already consolidate the collateral of these trusts on our consolidated balance sheets.
	-2	Our maximum exposure to loss for non-Freddie Mac security trusts and certain other VIEs is computed as the carrying amount if the security is classified as trading or the amortized cost if the security is classified as available-for-sale for our investments recorded on our consolidated balance sheets.
	-3	Our maximum exposure to loss includes accrued interest receivable associated with these loans.
	-4	Except for unsecuritized multifamily loans, this represents the UPB of assets held by non-consolidated VIEs using the most current information available. For unsecuritized multifamily loans, this represents the fair value of the property serving as collateral for the loan.

Mortgage_Loans_and_Loan_Loss_R1

Mortgage Loans and Loan Loss Reserves (Tables)	12 Months Ended
	Dec. 31, 2014
Mortgage Loans on Real Estate [Abstract]
Table - Mortgage Loans	Table 4.1 — Mortgage Loans
		31-Dec-14									31-Dec-13
		Unsecuritized			Held By			Total			Unsecuritized			Held By			Total
					Consolidated									Consolidated
					Trusts									Trusts
		(in millions)
	Single-family:
	Fixed-rate
	Amortizing	$	105,560		$	1,431,872		$	1,537,432		$	113,597		$	1,402,841		$	1,516,438
	Interest-only	939			3,298			4,237			1,476			4,826			6,302
	Total fixed-rate	106,499			1,435,170			1,541,669			115,073			1,407,667			1,522,740
	Adjustable-rate
	Amortizing	1,353			68,632			69,985			1,935			65,429			67,364
	Interest-only	3,191			20,373			23,564			4,576			23,841			28,417
	Total adjustable-rate	4,544			89,005			93,549			6,511			89,270			95,781
	Other Guarantee Transactions	—			7,042			7,042			—			8,431			8,431
	FHA/VA and other governmental	473			3,139			3,612			553			3,354			3,907
	Total single-family	111,516			1,534,356			1,645,872			122,137			1,508,722			1,630,859
	Multifamily:
	Fixed-rate	43,632			524			44,156			50,701			444			51,145
	Adjustable-rate	9,321			—			9,321			8,467			—			8,467
	Other governmental	3			—			3			3			—			3
	Total multifamily	52,956			524			53,480			59,171			444			59,615
	Total UPB of mortgage loans	164,472			1,534,880			1,699,352			181,308			1,509,166			1,690,474
	Deferred fees, unamortized premiums, discounts and other cost basis adjustments	(3,366		)	26,098			22,732			(4,817		)	23,745			18,928
	Fair value adjustments on loans held-for sale	257			—			257			6			—			6
	Allowance for loan losses on mortgage loans held-for-investment	(18,877		)	(2,884		)	(21,761		)	(21,612		)	(3,006		)	(24,618		)
	Total mortgage loans, net	$	142,486		$	1,558,094		$	1,700,580		$	154,885		$	1,529,905		$	1,684,790
	Mortgage loans, net:
	Held-for-investment	$	130,118		$	1,558,094		$	1,688,212		$	146,158		$	1,529,905		$	1,676,063
	Held-for-sale	12,368			—			12,368			8,727			—			8,727
	Total mortgage loans, net	$	142,486		$	1,558,094		$	1,700,580		$	154,885		$	1,529,905		$	1,684,790
Table - Recorded Investment of Held-For-Invstment Mortgage Loans, by LTV Ratio	Table 4.2 — Recorded Investment of Held-For-Investment Mortgage Loans, by LTV Ratio
		As of December 31, 2014												As of December 31, 2013
		Estimated Current LTV Ratio(1)												Estimated Current LTV Ratio(1)
		≤ 80			> 80 to 100			> 100(2)			Total			≤ 80			> 80 to 100			> 100(2)			Total
		(in millions)
	Single-family loans:
	20 and 30-year or more, amortizing fixed-rate(3)	$	911,071		$	258,126		$	85,398		$	1,254,595		$	819,509		$	269,110		$	124,491		$	1,213,110
	15-year amortizing fixed-rate(3)	265,098			14,101			3,338			282,537			270,211			19,658			5,748			295,617
	Adjustable-rate	60,463			6,701			709			67,873			56,208			6,714			1,578			64,500
	Alt-A, interest-only, and option ARM	28,935			18,232			16,448			63,615			29,927			21,564			25,089			76,580
	Total single-family loans	$	1,265,567		$	297,160		$	105,893		1,668,620			$	1,175,855		$	317,046		$	156,906		1,649,807
	Multifamily loans										41,353												50,874
	Total recorded investment of held-for-investment loans										$	1,709,973											$	1,700,681
	-1	The current LTV ratios are management estimates, which are updated on a monthly basis. Market values are estimated by adjusting the value of the property at origination based on changes in the market value of homes in the same geographic area since that time. Changes in market value are derived from our internal index which measures price changes for repeat sales and refinancing activity on the same properties using Freddie Mac and Fannie Mae single-family mortgage acquisitions, including foreclosure sales. Estimates of the current LTV ratio include the credit-enhanced portion of the loan and exclude any secondary financing by third parties.
	-2	The serious delinquency rate for the total of single-family held-for-investment mortgage loans with estimated current LTV ratios in excess of 100% was 9.01% and 9.89% as of December 31, 2014 and 2013, respectively.
	-3	The majority of our loan modifications result in new terms that include fixed interest rates after modification. As of December 31, 2014 and 2013, we have categorized UPB of approximately $42.3 billion and $43.8 billion, respectively, of modified loans as fixed-rate loans (instead of as adjustable rate loans), even though the modified loans have rate adjustment provisions. In these cases, while the terms of the modified loans provide for the interest rate to adjust in the future, such future rates are determined at the time of modification rather than at a subsequent date.
Table - Detail of Loan Loss Reserves	Table 4.3 — Detail of Loan Loss Reserves
		Year Ended December 31,
		2014												2013
		Allowance for Loan Losses						Reserve  for						Allowance for Loan Losses						Reserve  for
								Guarantee												Guarantee
		Unsecuritized			Held By			Losses			Total			Unsecuritized			Held By			Losses			Total
					Consolidated												Consolidated
					Trusts												Trusts
		(in millions)
	Single-family:
	Beginning balance	$	21,487		$	3,006		$	85		$	24,578		$	25,449		$	4,918		$	141		$	30,508
	Provision (benefit) for credit losses	(864		)	947			30			113			(3,995		)	1,790			(42		)	(2,247		)
	Charge-offs	(4,510		)	(376		)	(6		)	(4,892		)	(8,181		)	(804		)	(10		)	(8,995		)
	Recoveries	998			260			—			1,258			3,810			503			—			4,313
	Transfers, net(1)	1,689			(953		)	—			736			4,404			(3,401		)	(4		)	999
	Ending balance	$	18,800		$	2,884		$	109		$	21,793		$	21,487		$	3,006		$	85		$	24,578
	Multifamily:
	Beginning balance	$	125		$	—		$	26		$	151		$	339		$	1		$	42		$	382
	Provision (benefit) for credit losses	(46		)	—			(9		)	(55		)	(208		)	(1		)	(9		)	(218		)
	Charge-offs	(3		)	—			—			(3		)	(7		)	—			—			(7		)
	Recoveries	1			—			—			1			1			—			—			1
	Transfers, net(1)	—			—			—			—			—			—			(7		)	(7		)
	Ending balance	$	77		$	—		$	17		$	94		$	125		$	—		$	26		$	151
	Total:
	Beginning balance	$	21,612		$	3,006		$	111		$	24,729		$	25,788		$	4,919		$	183		$	30,890
	Provision (benefit) for credit losses	(910		)	947			21			58			(4,203		)	1,789			(51		)	(2,465		)
	Charge-offs	(4,513		)	(376		)	(6		)	(4,895		)	(8,188		)	(804		)	(10		)	(9,002		)
	Recoveries	999			260			—			1,259			3,811			503			—			4,314
	Transfers, net(1)	1,689			(953		)	—			736			4,404			(3,401		)	(11		)	992
	Ending balance	$	18,877		$	2,884		$	126		$	21,887		$	21,612		$	3,006		$	111		$	24,729
	Ratio of total loan loss reserves (excluding TDR concessions) to net charge-offs for single-family loans(2)										2.5												1.9
	Ratio of total loan loss reserves to net charge-offs for single-family loans(2)										5.2												3.5
	-1	For the years ended December 31, 2014 and 2013, consists of: (a) approximately $1.0 billion and $3.4 billion, respectively, of reclassified single-family reserves related to our removal of loans previously held by consolidated trusts, net of reclassifications for single-family loans subsequently resecuritized after such removal; and (b) approximately $0.7 billion and $1.0 billion, respectively, attributable to capitalization of past due interest on modified mortgage loans.
	-2	Excludes amounts associated with loans acquired with deteriorated credit quality (at the time of our acquisition) and recoveries related to settlements.
Table - Net Investment in Mortgage Loans	Table 4.4 — Net Investment in Mortgage Loans
		31-Dec-14									31-Dec-13
		Single-family			Multifamily			Total			Single-family			Multifamily			Total
		(in millions)
	Recorded investment:
	Collectively evaluated	$	1,568,237		$	40,451		$	1,608,688		$	1,551,667		$	49,598		$	1,601,265
	Individually evaluated	100,383			902			101,285			98,140			1,276			99,416
	Total recorded investment	1,668,620			41,353			1,709,973			1,649,807			50,874			1,700,681
	Ending balance of the allowance for loan losses:
	Collectively evaluated	(3,847		)	(25		)	(3,872		)	(5,939		)	(45		)	(5,984		)
	Individually evaluated	(17,837		)	(52		)	(17,889		)	(18,554		)	(80		)	(18,634		)
	Total ending balance of the allowance	(21,684		)	(77		)	(21,761		)	(24,493		)	(125		)	(24,618		)
	Net investment in mortgage loans	$	1,646,936		$	41,276		$	1,688,212		$	1,625,314		$	50,749		$	1,676,063
Table - Recourse and other forms of credit protection	Table 4.5 — Recourse and Other Forms of Credit Protection(1)
		UPB at						Maximum Coverage(2) at
		31-Dec-14			31-Dec-13			31-Dec-14			31-Dec-13
		(in millions)
	Single-family:
	Primary mortgage insurance	$	227,495		$	203,470		$	57,938		$	50,823
	Other credit protection:
	Credit risk transfer transactions(3)	144,272			56,903			6,657			1,183
	Lender recourse and indemnifications	6,527			7,119			6,092			6,726
	Pool insurance(4)	2,284			4,683			947			1,186
	HFA indemnification	3,357			4,051			3,324			3,323
	Subordination(5)	2,377			2,644			339			399
	Other credit enhancements	20			38			18			38
	Total	$	386,332		$	278,908		$	75,315		$	63,678
	Multifamily:
	K Certificates	$	75,541		$	59,326		$	13,576		$	10,601
	Subordination(5)	4,724			4,435			796			756
	HFA indemnification	772			905			699			699
	Other credit enhancements	5,706			6,666			1,685			1,834
	Total	$	86,743		$	71,332		$	16,756		$	13,890
	-1	Except for our credit risk transfer transactions, our credit enhancements generally provide protection for the first, or initial credit losses associated with the related loans. Excludes: (a) FHA/VA and other governmental loans; (b) purchased credit protection associated with $9.8 billion and $11.5 billion in UPB of single-family loans underlying Other Guarantee Transactions as of December 31, 2014 and 2013, respectively; and (c) repurchase rights (subject to certain conditions and limitations) we have under representations and warranties provided by our agreements with seller/servicers to underwrite loans and service them in accordance with our standards.
	-2	Except for subordination and K Certificates, this represents the remaining amount of loss recovery that is available subject to terms of counterparty agreements. For subordination and K Certificates coverage, this represents the UPB of the securities that are subordinate to our guarantee, which could provide protection by absorbing first losses.
	-3	Excludes $48.3 billion in UPB at December 31, 2014 where the related loans are also covered by primary mortgage insurance. Maximum coverage amounts presented represent the outstanding balance of STACR debt securities held by third parties as well as the remaining aggregate limit of insurance purchased from third parties in ACIS transactions.
	-4	Excludes approximately $0.9 billion and $1.8 billion in UPB at December 31, 2014 and 2013, respectively, where the related loans are also covered by primary mortgage insurance.
	-5	Represents Freddie Mac issued mortgage-related securities with subordination protection, excluding multifamily K Certificates and those securities backed by state and local HFA bonds related to the HFA initiative.

Impaired_Loans_Tables

Impaired Loans (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Table - Individually Impaired Loans	Table 5.1 — Individually Impaired Loans
			Balance at December 31, 2014															For the Year Ended December 31, 2014
			UPB				Recorded				Associated				Net			Average			Interest		Interest Income
							Investment				Allowance				Investment			Recorded			Income		Recognized
																		Investment			Recognized		On Cash Basis(1)
			(in millions)
	Single-family —
	With no specific allowance recorded(2):
	20 and 30-year or more, amortizing fixed-rate		$	6,041			$	4,007			N/A				$	4,007		$	3,727		$	376	$	33
	15-year amortizing fixed-rate		63				44				N/A				44			39			10		1
	Adjustable-rate		27				22				N/A				22			17			1		—
	Alt-A, interest-only, and option ARM		1,717				1,168				N/A				1,168			1,133			81		6
	Total with no specific allowance recorded		7,848				5,241				N/A				5,241			4,916			468		40
	With specific allowance recorded:(3)
	20 and 30-year or more, amortizing fixed-rate		77,798				76,708				$	(14,051	)		62,657			75,773			2,357		279
	15-year amortizing fixed-rate		1,226				1,233				(40		)		1,193			1,242			54		10
	Adjustable-rate		868				866				(65		)		801			881			23		6
	Alt-A, interest-only, and option ARM		16,734				16,335				(3,681		)		12,654			16,476			380		58
	Total with specific allowance recorded		96,626				95,142				(17,837		)		77,305			94,372			2,814		353
	Combined single-family:
	20 and 30-year or more, amortizing fixed-rate		83,839				80,715				(14,051		)		66,664			79,500			2,733		312
	15-year amortizing fixed-rate		1,289				1,277				(40		)		1,237			1,281			64		11
	Adjustable-rate		895				888				(65		)		823			898			24		6
	Alt-A, interest-only, and option ARM		18,451				17,503				(3,681		)		13,822			17,609			461		64
	Total single-family		$	104,474			$	100,383			$	(17,837	)		$	82,546		$	99,288		$	3,282	$	393
	Multifamily —
	With no specific allowance recorded(4)		$	440			$	431			N/A				$	431		$	659		$	29	$	9
	With specific allowance recorded		480				471				$	(52	)		419			535			26		16
	Total multifamily		$	920			$	902			$	(52	)		$	850		$	1,194		$	55	$	25
	Total single-family and multifamily		$	105,394			$	101,285			$	(17,889	)		$	83,396		$	100,482		$	3,337	$	418
			Balance at December 31, 2013															For the Year Ended December 31, 2013
			UPB				Recorded Investment				Associated				Net			Average			Interest		Interest Income
											Allowance				Investment			Recorded			Income		Recognized
																		Investment			Recognized		On Cash Basis(1)
		(in millions)
	Single-family —
	With no specific allowance recorded(2):
	20 and 30-year or more, amortizing fixed-rate		$	5,927			$	3,355			N/A				$	3,355		$	3,370		$	394	$	34
	15-year amortizing fixed-rate		62				34				N/A				34			31			6		1
	Adjustable rate		19				13				N/A				13			13			1		—
	Alt-A, interest-only, and option ARM		1,758				1,038				N/A				1,038			978			72		6
	Total with no specific allowance recorded		7,766				4,440				N/A				4,440			4,392			473		41
	With specific allowance recorded:(3)
	20 and 30-year or more, amortizing fixed-rate		75,633				74,554				$	(14,431	)		60,123			69,922			2,127		282
	15-year amortizing fixed-rate		1,324				1,324				(43		)		1,281			1,109			50		11
	Adjustable rate		967				962				(84		)		878			855			22		6
	Alt-A, interest-only, and option ARM		17,210				16,860				(3,996		)		12,864			16,526			369		69
	Total with specific allowance recorded		95,134				93,700				(18,554		)		75,146			88,412			2,568		368
	Combined single-family:
	20 and 30-year or more, amortizing fixed-rate		81,560				77,909				(14,431		)		63,478			73,292			2,521		316
	15-year amortizing fixed-rate		1,386				1,358				(43		)		1,315			1,140			56		12
	Adjustable rate		986				975				(84		)		891			868			23		6
	Alt-A, interest-only, and option ARM		18,968				17,898				(3,996		)		13,902			17,504			441		75
	Total single-family		$	102,900			$	98,140			$	(18,554	)		$	79,586		$	92,804		$	3,041	$	409
	Multifamily —
	With no specific allowance recorded(4)		$	694			$	681			N/A				$	681		$	1,108		$	48	$	20
	With specific allowance recorded		608				595				$	(80	)		515			891			41		31
	Total multifamily		$	1,302			$	1,276			$	(80	)		$	1,196		$	1,999		$	89	$	51
	Total single-family and multifamily		$	104,202			$	99,416			$	(18,634	)		$	80,782		$	94,803		$	3,130	$	460
	-1	Consists of income recognized during the period related to loans on non-accrual status.
	-2	Individually impaired single-family loans with no specific related valuation allowance primarily represent mortgage loans removed from PC pools and accounted for in accordance with the accounting guidance for loans and debt securities acquired with deteriorated credit quality that have not experienced further deterioration.
	-3	Consists primarily of mortgage loans classified as TDRs.
	-4	Individually impaired multifamily loans with no specific related valuation allowance primarily represent those loans for which the collateral value is sufficiently in excess of the loan balance to result in recovery of the entire recorded investment if the property were foreclosed upon or otherwise subject to disposition.
Table - Payment Status of Mortgage Loans	Table 5.2 — Payment Status of Mortgage Loans
		31-Dec-14
		Current				One				Two				Three Months or			Total			Non-accrual
						Month				Months				More Past Due,
						Past Due				Past Due				or in Foreclosure
		(in millions)
	Single-family:
	20 and 30-year or more, amortizing fixed-rate	$	1,207,826			$	17,516			$	5,817			$	23,436		$	1,254,595		$	23,433
	15-year amortizing fixed-rate	280,629				1,010				216				682			282,537			682
	Adjustable-rate	66,737				406				118				612			67,873			612
	Alt-A, interest-only, and option ARM	53,251				2,368				948				7,048			63,615			7,045
	Total single-family	1,608,443				21,300				7,099				31,778			1,668,620			31,772
	Total multifamily	41,335				7				11				—			41,353			385
	Total single-family and multifamily	$	1,649,778			$	21,307			$	7,110			$	31,778		$	1,709,973		$	32,157
		December 31, 2013
		Current				One				Two				Three Months or			Total			Non-accrual
						Month				Months				More Past Due,
						Past Due				Past Due				or in Foreclosure
		(in millions)
	Single-family:
	20 and 30-year or more, amortizing fixed-rate	$	1,157,057			$	19,743			$	6,675			$	29,635		$	1,213,110		$	29,620
	15-year amortizing fixed-rate	293,286				1,196				271				864			295,617			863
	Adjustable-rate	62,987				495				147				871			64,500			871
	Alt-A, interest-only, and option ARM	62,356				2,898				1,157				10,169			76,580			10,162
	Total single-family	1,575,686				24,332				8,250				41,539			1,649,807			41,516
	Total multifamily	50,827				—				21				26			50,874			627
	Total single-family and multifamily	$	1,626,513			$	24,332			$	8,271			$	41,565		$	1,700,681		$	42,143
Table - Delinquency Rates	Table 5.3 — Delinquency Rates
		31-Dec-14				31-Dec-13
	Single-family:(1)
	Non-credit-enhanced portfolio
	Serious delinquency rate	1.74		%		2.09		%
	Total number of seriously delinquent loans	150,300				190,119
	Credit-enhanced portfolio:(2)
	Primary mortgage insurance:
	Serious delinquency rate	3.1		%		4.4		%
	Total number of seriously delinquent loans	38,595				51,600
	Other credit protection:(3)
	Serious delinquency rate	1.21		%		3.66		%
	Total number of seriously delinquent loans	12,175				15,828
	Total single-family:
	Serious delinquency rate	1.88		%		2.39		%
	Total number of seriously delinquent loans	200,069				255,325
	Multifamily:(4)
	Non-credit-enhanced portfolio:
	Delinquency rate	0.02		%		0.07		%
	UPB of delinquent loans (in millions)	$	11			$	46
	Credit-enhanced portfolio:
	Delinquency rate	0.05		%		0.11		%
	UPB of delinquent loans (in millions)	$	44			$	75
	Total Multifamily:
	Delinquency rate	0.04		%		0.09		%
	UPB of delinquent loans (in millions)	$	55			$	121
	-1	Serious delinquencies on single-family mortgage loans underlying certain REMICs and Other Structured Securities, Other Guarantee Transactions, and other guarantee commitments may be reported on a different schedule due to variances in industry practice. In the third quarter of 2014, we revised our presentation of single-family non-credit enhanced and credit-enhanced serious delinquency rates. This revision did not impact our total single-family serious delinquency rate. Prior periods have been revised to conform with the current presentation.
	-2	The credit enhanced categories are not mutually exclusive as a single loan may be covered by both primary mortgage insurance and other credit protection.
	-3	Consists of single-family mortgage loans covered by financial arrangements (other than primary mortgage insurance) that are designed to reduce our credit risk exposure. See "Table 4.5 — Recourse and Other Forms of Credit Protection" for more information.
	-4	Multifamily delinquency performance is based on UPB of mortgage loans that are two monthly payments or more past due or those in the process of foreclosure and includes multifamily Other Guarantee Transactions (e.g., K Certificates).
Table - TDR Activity, by Segment	Table 5.4 — TDR Activity, by Segment
		Year Ended December 31,
		2014							2013
		Number of Loans			Post-TDR				Number of Loans			Post-TDR
					Recorded							Recorded
					Investment							Investment
		(dollars in millions)
	Single-family:(1)
	20 and 30-year or more, amortizing fixed-rate	68,186			$	10,172			101,538			$	16,014
	15-year amortizing fixed-rate	7,189			528				11,671			825
	Adjustable-rate	1,849			285				3,604			574
	Alt-A, interest-only, and option ARM	9,112			1,865				17,770			3,941
	Total Single-family	86,336			12,850				134,583			21,354
	Multifamily	2			15				8			98
	Total	86,338			$	12,865			134,591			$	21,452
	-1	The pre-TDR recorded investment for single-family loans initially classified as TDR during the years ended December 31, 2014 and 2013 was $12.8 billion and $21.2 billion, respectively.
Table - Payment Defaults of Completed TDR Modifications, by Segment	Table 5.5 — Payment Defaults of Completed TDR Modifications, by Segment(1)
		Year Ended December 31,
		2014							2013
		Number of Loans			Post-TDR				Number of Loans			Post-TDR
					Recorded							Recorded
					Investment(2)							Investment(2)
		(dollars in millions)
	Single-family:
	20 and 30-year or more, amortizing fixed-rate	19,101			$	3,384			14,964			$	2,766
	15-year amortizing fixed-rate	645			62				471			52
	Adjustable-rate	332			61				237			50
	Alt-A, interest-only, and option ARM	2,357			564				2,256			587
	Total single-family	22,435			$	4,071			17,928			$	3,455
	Multifamily	—			$	—			—			$	—
	-1	Represents TDR loans that experienced a payment default during the period and had completed a modification during the year preceding the payment default.
	-2	Represents the recorded investment at the end of the period in which the loan was modified and does not represent the recorded investment as of December 31.

Real_Estate_Owned_Tables

Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2014
Repossessed Assets [Abstract]
Table - REO	Table 6.1 — REO
		Year Ended December 31,
		2014			2013			2012
		(in millions)
	Beginning balance — REO	$	4,602		$	4,407		$	5,827
	Additions	4,110			6,498			7,029
	Dispositions	(6,028		)	(6,303		)	(8,449		)
	Ending balance — REO	2,684			4,602			4,407
	Beginning balance, valuation allowance	(51		)	(29		)	(147		)
	Change in valuation allowance	(75		)	(22		)	118
	Ending balance, valuation allowance	(126		)	(51		)	(29		)
	Ending balance — REO, net	$	2,558		$	4,551		$	4,378

Investments_in_Securities_Tabl

Investments in Securities (Tables)	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Table - Available-For-Sale Securities	Table 7.1 — Available-For-Sale Securities
										Gross Unrealized Losses
	31-Dec-14	Amortized				Gross				Other-Than-Temporary Impairment(1)			Temporary Impairment(2)			Fair
		Cost				Unrealized										Value
						Gains
		(in millions)
	Available-for-sale securities:
	Freddie Mac	$	37,710			$	1,435			$	—		$	(46	)	$	39,099
	Fannie Mae	10,860				463				—			(10		)	11,313
	Ginnie Mae	183				16				—			—			199
	CMBS	20,988				890				(2		)	(54		)	21,822
	Subprime	20,210				989				(518		)	(92		)	20,589
	Option ARM	5,460				372				(179		)	(4		)	5,649
	Alt-A and other	4,500				578				(29		)	(6		)	5,043
	Obligations of states and political subdivisions	2,166				34				—			(2		)	2,198
	Manufactured housing	556				84				(2		)	—			638
	Total available-for-sale securities	$	102,633			$	4,861			$	(730	)	$	(214	)	$	106,550
	31-Dec-13
	Available-for-sale securities:
	Freddie Mac	$	39,001			$	1,847			$	—		$	(189	)	$	40,659
	Fannie Mae	10,140				660				—			(3		)	10,797
	Ginnie Mae	149				18				—			—			167
	CMBS	29,151				1,524				(23		)	(314		)	30,338
	Subprime	29,897				382				(2,467		)	(313		)	27,499
	Option ARM	6,617				338				(376		)	(5		)	6,574
	Alt-A and other	8,322				526				(118		)	(24		)	8,706
	Obligations of states and political subdivisions	3,533				23				(7		)	(54		)	3,495
	Manufactured housing	629				61				(4		)	(2		)	684
	Total available-for-sale securities	$	127,439			$	5,379			$	(2,995	)	$	(904	)	$	128,919
	-1	Represents the gross unrealized losses for securities for which we have previously recognized other-than-temporary impairments in earnings.
	-2	Represents the gross unrealized losses for securities for which we have not previously recognized other-than-temporary impairments in earnings.
Table - Available-For-Sale Securities in a Gross Unrealized Loss Position	Table 7.2 — Available-For-Sale Securities in a Gross Unrealized Loss Position
		Less than 12 Months								12 Months or Greater
	31-Dec-14	Fair				Gross Unrealized Losses				Fair			Gross Unrealized Losses
		Value								Value
		(in millions)
	Available-for-sale securities:
	Freddie Mac	$	2,531			$	(14	)		$	936		$	(32	)
	Fannie Mae	2,693				(9		)		5			(1		)
	Ginnie Mae	66				—				—			—
	CMBS	184				(5		)		1,149			(51		)
	Subprime	286				(3		)		6,533			(607		)
	Option ARM	77				—				1,490			(183		)
	Alt-A and other	185				(5		)		499			(30		)
	Obligations of states and political subdivisions	48				—				28			(2		)
	Manufactured housing	42				—				15			(2		)
	Total available-for-sale securities in a gross unrealized loss position	$	6,112			$	(36	)		$	10,655		$	(908	)
	31-Dec-13
	Available-for-sale securities:
	Freddie Mac	$	7,957			$	(144	)		$	649		$	(45	)
	Fannie Mae	248				(2		)		19			(1		)
	CMBS	1,147				(85		)		1,992			(252		)
	Subprime	472				(19		)		19,103			(2,761		)
	Option ARM	77				(2		)		2,608			(379		)
	Alt-A and other	262				(5		)		1,854			(137		)
	Obligations of states and political subdivisions	1,885				(56		)		24			(5		)
	Manufactured housing	—				—				65			(6		)
	Total available-for-sale securities in a gross unrealized loss position	$	12,048			$	(313	)		$	26,314		$	(3,586	)
Table - Significant Modeled Attributes for Certain Available-For-Sale Non-Agency Mortgage-Related Securities	Table 7.3 — Significant Modeled Attributes for Certain Available-For-Sale Non-Agency Mortgage-Related Securities
		31-Dec-14
										Alt-A
		Subprime				Option ARM				Fixed Rate			Variable Rate			Hybrid Rate
		(dollars in millions)
	Issuance Date
	2004 and prior:
	UPB	$	534			$	38			$	335		$	258		$	189
	Weighted average collateral defaults(1)	33		%		19		%		13		%	30		%	15		%
	Weighted average collateral severities(2)	61		%		46		%		45		%	42		%	38		%
	Weighted average voluntary prepayment rates(3)	7		%		11		%		13		%	8		%	10		%
	Average credit enhancements(4)	31		%		—		%		14		%	11		%	13		%
	2005:00:00
	UPB	$	2,667			$	1,743			$	479		$	374		$	1,107
	Weighted average collateral defaults(1)	43		%		26		%		18		%	37		%	21		%
	Weighted average collateral severities(2)	63		%		47		%		45		%	52		%	41		%
	Weighted average voluntary prepayment rates(3)	4		%		10		%		12		%	8		%	11		%
	Average credit enhancements(4)	48		%		1		%		(1		)%	17		%	2		%
	2006:00:00
	UPB	$	11,204			$	4,063			$	226		$	418		$	422
	Weighted average collateral defaults(1)	49		%		35		%		25		%	38		%	30		%
	Weighted average collateral severities(2)	63		%		47		%		44		%	48		%	41		%
	Weighted average voluntary prepayment rates(3)	3		%		8		%		10		%	8		%	10		%
	Average credit enhancements(4)	7		%		(3		)%		(2		)%	1		%	(4		)%
	2007:00:00
	UPB	$	13,277			$	2,443			$	118		$	458		$	165
	Weighted average collateral defaults(1)	49		%		34		%		40		%	38		%	29		%
	Weighted average collateral severities(2)	63		%		48		%		51		%	49		%	43		%
	Weighted average voluntary prepayment rates(3)	3		%		8		%		7		%	8		%	10		%
	Average credit enhancements(4)	1		%		3		%		(1		)%	(19		)%	—		%
	Total:
	UPB	$	27,682			$	8,287			$	1,158		$	1,508		$	1,883
	Weighted average collateral defaults(1)	48		%		33		%		20		%	36		%	23		%
	Weighted average collateral severities(2)	63		%		47		%		46		%	48		%	41		%
	Weighted average voluntary prepayment rates(3)	3		%		8		%		12		%	8		%	11		%
	Average credit enhancements(4)	9		%		—		%		3		%	1		%	2		%
	-1	The expected cumulative default rate is expressed as a percentage of the current collateral UPB.
	-2	The expected average loss given default is calculated as the ratio of cumulative loss over cumulative default for each security.
	-3	The security’s voluntary prepayment rate represents the average of the monthly voluntary prepayment rate weighted by the security’s outstanding UPB.
	-4	Positive values reflect the amount of subordination and other financial support (excluding credit enhancement provided by bond insurance) that will incur losses in the securitization structure before any losses are allocated to securities that we own. Percentage generally calculated based on: (a) the total UPB of securities subordinate to the securities we own; divided by (b) the total UPB of all of the securities issued by the trust (excluding notional balances). Negative values are shown when unallocated collateral losses will be allocated to the securities that we own in excess of current remaining credit enhancement, if any. The unallocated collateral losses have been considered in our assessment of other-than-temporary impairment.
Table - Net Impairment of Available-For-Sale Securities Recognized in Earnings	Table 7.4 — Net Impairment of Available-For-Sale Securities Recognized in Earnings
		Net Impairment of Available-For-Sale Securities Recognized in Earnings For the Year Ended December 31,
		2014				2013				2012
		(in millions)
	Available-for-sale securities:(1)
	CMBS	$	—			$	(14	)		$	(138	)
	Subprime	(794		)		(1,258		)		(1,274		)
	Option ARM	(101		)		(58		)		(556		)
	Alt-A and other	(42		)		(179		)		(196		)
	Manufactured housing	(1		)		(1		)		(4		)
	Total net impairment of available-for-sale securities recognized in earnings	$	(938	)		$	(1,510	)		$	(2,168	)
	-1	Includes $817 million, $568 million, and $0 million of other-than-temporary impairments recognized in earnings for the years ended December 31, 2014, 2013, and 2012, respectively, as we had the intent to sell the related securities before recovery of their amortized cost basis.
Table - Other-Than-Temporary Impairments Related to Credit Losses on Available-For-Sale Securities	Table 7.5 — Other-Than-Temporary Impairments Related to Credit Losses on Available-For-Sale Securities
			Year Ended December 31,
			2014				2013
		(in millions)
	Credit-related other-than-temporary impairments on available-for-sale securities recognized in earnings:
	Beginning balance — remaining credit losses on available-for-sale securities where other-than-temporary impairments were recognized in earnings		$	14,463			$	16,745
	Additions:
	Amounts related to credit losses for which an other-than-temporary impairment was not previously recognized		—				46
	Amounts related to credit losses for which an other-than-temporary impairment was previously recognized		121				896
	Reductions:
	Amounts related to securities which were sold, written off, or matured		(1,188		)		(1,193		)
	Amounts for which we intend to sell the security or it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis		(6,113		)		(1,536		)
	Amounts related to amortization resulting from significant increases in cash flows expected to be collected and/or due to the passage of time that are recognized over the remaining life of the security		(485		)		(495		)
	Ending balance — remaining credit losses on available-for-sale securities where other-than-temporary impairments were recognized in earnings(1)		$	6,798			$	14,463
	-1	Excludes other-than-temporary impairments on securities that we intend to sell or it is more likely than not that we will be required to sell before recovery of the unrealized losses.
Table - Gross Realized Gains and Gross Realized Losses on Sales of Available-For-Sale Securities	Table 7.6 — Gross Realized Gains and Gross Realized Losses on Sales of Available-For-Sale Securities
		Year Ended December 31,
		2014				2013				2012
		(in millions)
	Gross realized gains	$	1,897			$	1,950			$	152
	Gross realized losses	(185		)		(51		)		—
	Net realized gains (losses)	$	1,712			$	1,899			$	152
Table - Maturities of Available-For-Sale Securities	Table 7.7 — Contractual Maturities of Available-For-Sale Securities
		As of December 31, 2014
																After One Year Through Five Years					After Five Years Through Ten Years
		Total Amortized Cost				Total Fair Value				One Year or Less																After Ten Years
										Amortized Cost			Fair Value			Amortized Cost			Fair Value		Amortized Cost			Fair Value		Amortized Cost			Fair Value
		(dollars in millions)
	Available-for-sale securities:
	Freddie Mac	$	37,710			$	39,099			$	—		$	—		$	300		$	309	$	526		$	559	$	36,884		$	38,231
	Fannie Mae	10,860				11,313				1			1			61			64		108			120		10,690			11,128
	Ginnie Mae	183				199				—			—			4			4		22			26		157			169
	CMBS	20,988				21,822				—			—			316			330		8			8		20,664			21,484
	Subprime	20,210				20,589				—			—			—			—		—			—		20,210			20,589
	Option ARM	5,460				5,649				—			—			—			—		—			—		5,460			5,649
	Alt-A and other	4,500				5,043				1			1			31			31		2			2		4,466			5,009
	Obligations of states and political subdivisions	2,166				2,198				—			—			40			43		48			49		2,078			2,106
	Manufactured housing	556				638				—			—			—			—		9			11		547			627
	Total available-for-sale securities	$	102,633			$	106,550			$	2		$	2		$	752		$	781	$	723		$	775	$	101,156		$	104,992
	Weighted Average Yield(1)	2.65		%						7.63		%				5.04		%			5.1		%			2.61		%
	-1	The weighted average yield is calculated based on a yield for each individual lot held at December 31, 2014 excluding any fully taxable-equivalent adjustments related to tax exempt sources of interest income. The numerator for the individual lot yield consists of the sum of: (a) the year-end interest coupon rate multiplied by the year-end UPB; and (b) the amortization income or expense calculated for December 2014 (excluding the accretion of non-credit-related other-than-temporary impairments and any adjustments recorded for changes in the effective rate). The denominator for the individual lot yield consists of the year-end amortized cost of the lot excluding effects of other-than-temporary impairments on the UPB of impaired lots.
Table - Trading Securities	Table 7.8 — Trading Securities
		31-Dec-14				31-Dec-13
		(in millions)
	Mortgage-related securities:
	Freddie Mac	$	17,469			$	9,349
	Fannie Mae	6,099				7,180
	Ginnie Mae	16				98
	Other	171				141
	Total mortgage-related securities	23,755				16,768
	U.S. Treasury securities	6,682				6,636
	Total fair value of trading securities	$	30,437			$	23,404

Debt_Securities_and_Subordinat1

Debt Securities and Subordinated Borrowings (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Table - Other Short-term Debt	Table 8.1 — Other Short-Term Debt
		31-Dec-14											31-Dec-13
		Par Value				Carrying Amount				Weighted			Par Value				Carrying Amount				Weighted
										Average											Average
										Effective Rate											Effective Rate
		(dollars in millions)
	Other short-term debt:
	Reference Bills® securities and discount notes	$	134,670			$	134,619			0.12	%		$	137,767			$	137,712			0.13	%
	Medium-term notes	—				—				—			4,000				4,000				0.16
	Total other short-term debt	$	134,670			$	134,619			0.12			$	141,767			$	141,712			0.13
Table - Other Long-term Debt	Table 8.2 — Other Long-Term Debt
		31-Dec-14													31-Dec-13
		Contractual Maturity		Par Value				Carrying Amount(1)				Weighted Average			Par Value				Carrying Amount(1)				Weighted Average
												Effective Rate											Effective Rate
		(dollars in millions)
	Other long-term debt:
	Other senior debt:
	Fixed-rate:
	Medium-term notes — callable	2015 - 2037		$	98,860			$	98,856			1.35	%		$	101,190			$	101,236			1.51	%
	Medium-term notes — non-callable	2015 - 2028		20,059				20,383				0.86			37,878				38,107				0.99
	U.S. dollar Reference Notes securities — non-callable	2015 - 2032		151,701				151,751				2.8			190,371				190,406				2.71
	€Reference Notes securities — non-callable			—				—							528				529				4.38
	Variable-rate:
	Medium-term notes — callable	2015 - 2029		7,210				7,210				2			6,001				6,001				1.66
	Medium-term notes — non-callable	2015 - 2026		23,971				23,971				0.19			18,533				18,533				0.22
	STACR	2023 - 2024		5,896				5,820				3.16			1,107				1,155				4.29
	Zero-coupon:
	Medium-term notes — callable	2037		1,000				264				6.17			1,200				311				5.82
	Medium-term notes — non-callable	2015 - 2039		10,109				6,739				2.53			12,217				8,334				3.08
	Hedging-related basis adjustments			N/A				34							N/A				41
	Total other senior debt			318,806				315,028							369,025				364,653
	Other subordinated debt:
	Fixed-rate	2016 - 2018		221				219				6.6			221				218				6.6
	Zero-coupon	2019		332				203				10.51			332				184				10.51
	Total other subordinated debt			553				422							553				402
	Total other long-term debt			$	319,359			$	315,450			2.02	%		$	369,578			$	365,055			2.08	%
	-1	Includes $5.8 billion and $2.6 billion, respectively, of other long-term debt that represents the fair value of debt securities with the fair value option elected at December 31, 2014 and 2013.
Table - Debt Securities of Consolidated Trusts Held by Third Parties	Table 8.3 — Debt Securities of Consolidated Trusts Held by Third Parties
		31-Dec-14													31-Dec-13
		Contractual		UPB				Carrying Amount				Weighted			Contractual		UPB				Carrying Amount				Weighted
		Maturity										Average			Maturity										Average
												Coupon(1)													Coupon(1)
		(dollars in millions)													(dollars in millions)
	Single-family:
	30-year or more, fixed-rate	2015 - 2053		$	1,018,357			$	1,047,302			4.04	%		2014 - 2052		$	969,270			$	993,683			4.14	%
	20-year fixed-rate	2015 - 2035		71,545				73,764				3.74			2014 - 2034		75,910				78,252				3.81
	15-year fixed-rate	2015 - 2030		266,117				272,538				3.13			2014 - 2029		270,513				277,018				3.23
	Adjustable-rate	2015 - 2047		65,082				66,518				2.62			2014 - 2047		60,683				61,830				2.64
	Interest-only	2026 - 2041		17,474				17,524				3.29			2026 - 2041		21,352				21,390				3.7
	FHA/VA	2015 - 2044		1,226				1,250				5.42			2014 - 2041		1,284				1,303				5.67
	Total single-family			1,439,801				1,478,896									1,399,012				1,433,476
	Multifamily(2)	2017 - 2019		524				577				4.93			2018 - 2019		444				508				4.96
	Total debt securities of consolidated trusts held by third parties			$	1,440,325			$	1,479,473								$	1,399,456			$	1,433,984
	-1	The effective rate for debt securities of consolidated trusts held by third parties was 3.19% and 3.39% as of December 31, 2014 and 2013, respectively.
	-2	Carrying amount includes interest-only securities recorded at fair value.
Table - Contractual Maturity of Other Long-term Debt and Debt Securities of Consolidated Trusts Held by Third Parties	Table 8.4 — Contractual Maturity of Other Long-Term Debt and Debt Securities of Consolidated Trusts Held by Third Parties
	Annual Maturities	Par  Value
		(in millions)
	Other long-term debt:
	2015	$	58,841
	2016	72,503
	2017	77,482
	2018	30,850
	2019	30,671
	Thereafter	49,012
	Debt securities of consolidated trusts held by third parties(1)	1,440,325
	Total	1,759,684
	Net discounts, premiums, hedge-related and other basis adjustments(2)	35,239
	Total debt securities of consolidated trusts held by third parties and other long-term debt	$	1,794,923
	-1	Contractual maturities of debt securities of consolidated trusts held by third parties may not represent expected maturity as they are prepayable at any time without penalty.
	-2	Other basis adjustments primarily represent changes in fair value attributable to instrument-specific credit risk.

Derivatives_Tables

Derivatives (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Table - Derivative Assets and Liabilities at Fair Value	Table 9.1 — Derivative Assets and Liabilities at Fair Value
		31-Dec-14									31-Dec-13
		Notional or			Derivatives at Fair Value						Notional or		Derivatives at Fair Value
		Contractual									Contractual
		Amount			Assets			Liabilities			Amount		Assets			Liabilities
		(in millions)
	Total derivative portfolio
	Derivatives not designated as hedging instruments under the accounting guidance for derivatives and hedging
	Interest-rate swaps:
	Receive-fixed	$	205,219		$	5,243		$	(487	)	$	281,727	$	4,475		$	(2,438	)
	Pay-fixed	213,325			408			(12,829		)	242,597		5,540			(10,879		)
	Basis (floating to floating)	300			2			—			300		4			—
	Total interest-rate swaps	418,844			5,653			(13,316		)	524,624		10,019			(13,317		)
	Option-based:
	Call swaptions
	Purchased	56,390			3,315			—			59,290		2,373			—
	Written	10,660			—			(90		)	5,945		—			(201		)
	Put Swaptions
	Purchased	22,125			179			—			33,410		698			—
	Written	3,560			—			(9		)	—		—			—
	Other option-based derivatives(1)	19,733			730			(28		)	23,365		1,041			(3		)
	Total option-based	112,468			4,224			(127		)	122,010		4,112			(204		)
	Futures	40,263			—			—			50,270		—			—
	Foreign-currency swaps	—			—			—			528		39			—
	Commitments	27,054			40			(79		)	18,731		61			(69		)
	Credit derivatives	5,207			27			(11		)	5,386		—			(6		)
	Swap guarantee derivatives	3,204			—			(27		)	3,477		—			(31		)
	Total derivatives not designated as hedging instruments	607,040			9,944			(13,560		)	725,026		14,231			(13,627		)
	Derivative interest receivable (payable)				817			(1,500		)			1,243			(1,835		)
	Netting adjustments(2)				(9,939		)	13,097					(14,411		)	15,282
	Total derivative portfolio, net	$	607,040		$	822		$	(1,963	)	$	725,026	$	1,063		$	(180	)
	-1	Primarily includes purchased interest-rate caps and floors and options on Treasury futures.
	-2	Represents counterparty netting and cash collateral netting. Net cash collateral posted was $3.2 billion and $871 million at December 31, 2014 and 2013, respectively.
Table - Gains and Losses on Derivatives	Table 9.2 — Gains and Losses on Derivatives
	Derivatives not designated as hedging	Derivative Gains (Losses)
	instruments under the accounting	Year Ended December 31,
	guidance for derivatives and hedging	2014			2013			2012
		(in millions)
	Interest-rate swaps:
	Receive-fixed
	Foreign-currency denominated	$	(1	)	$	(21	)	$	(33	)
	U.S. dollar denominated	4,074			(10,400		)	2,686
	Total receive-fixed swaps	4,073			(10,421		)	2,653
	Pay-fixed	(11,366		)	19,021			(2,865		)
	Basis (floating to floating)	(1		)	(2		)	8
	Total interest-rate swaps	(7,294		)	8,598			(204		)
	Option based:
	Call swaptions
	Purchased	2,355			(2,547		)	1,365
	Written	(168		)	546			(38		)
	Put swaptions
	Purchased	(1,006		)	(8		)	(273		)
	Written	8			—			6
	Other option-based derivatives(1)	248			(413		)	190
	Total option-based	1,437			(2,422		)	1,250
	Futures	(54		)	21			12
	Foreign-currency swaps	(7		)	30			(8		)
	Commitments	239			(131		)	298
	Credit derivatives	8			(3		)	—
	Swap guarantee derivatives	8			9			7
	Other	(3		)	(3		)	(1		)
	Subtotal	(5,666		)	6,099			1,354
	Accrual of periodic settlements:
	Receive-fixed interest-rate swaps	3,033			3,764			3,511
	Pay-fixed interest-rate swaps	(5,660		)	(7,233		)	(7,318		)
	Foreign-currency swaps	—			—			4
	Other	2			2			1
	Total accrual of periodic settlements	(2,625		)	(3,467		)	(3,802		)
	Total	$	(8,291	)	$	2,632		$	(2,448	)
	-1	Primarily includes purchased interest-rate caps and floors and options on Treasury futures.

Collateral_and_Offsetting_of_A1

Collateral and Offsetting of Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Offsetting [Abstract]
Table - Offsetting of Financial Assets and Liabilities	Table 10.1 — Offsetting of Financial Assets and Liabilities
		31-Dec-14
		Gross			Amount Offset			Net Amount			Gross Amount			Net
		Amount			in the Consolidated			Presented in			Not Offset in			Amount
		Recognized			Balance Sheets			the Consolidated			the Consolidated
								Balance Sheets(1)			Balance Sheets(2)
		(in millions)
	Assets:
	Derivatives:
	Over-the-counter interest-rate swaps and option-based derivatives	$	10,315		$	(9,688	)	$	627		$	(453	)	$	174
	Cleared and exchange-traded derivatives	379			(251		)	128			—			128
	Other	67			—			67			—			67
	Total derivatives	10,761			(9,939		)	822			(453		)	369
	Securities purchased under agreements to resell	51,903			—			51,903			(51,903		)	—
	Total	$	62,664		$	(9,939	)	$	52,725		$	(52,356	)	$	369
	Liabilities:
	Derivatives:
	Over-the-counter interest-rate swaps and option-based derivatives	$	(10,666	)	$	8,845		$	(1,821	)	$	1,743		$	(78	)
	Cleared and exchange-traded derivatives	(4,277		)	4,252			(25		)	—			(25		)
	Other	(117		)	—			(117		)	—			(117		)
	Total	$	(15,060	)	$	13,097		$	(1,963	)	$	1,743		$	(220	)
		December 31, 2013
		Gross			Amount Offset in			Net Amount			Gross Amount			Net
		Amount			the Consolidated			Presented in the			Not Offset in the			Amount
		Recognized			Balance Sheets			Consolidated			Consolidated
								Balance Sheets(1)			Balance Sheets(2)
		(in millions)
	Assets:
	Derivatives:
	Over-the-counter interest-rate and foreign-currency swaps, and option-based derivatives	$	13,886		$	(13,266	)	$	620		$	(432	)	$	188
	Cleared and exchange-traded derivatives	1,527			(1,145		)	382			—			382
	Other	61			—			61			—			61
	Total derivatives	15,474			(14,411		)	1,063			(432		)	631
	Securities purchased under agreements to resell	62,383			—			62,383			(62,383		)	—
	Total	$	77,857		$	(14,411	)	$	63,446		$	(62,815	)	$	631
	Liabilities:
	Derivatives:
	Over-the-counter interest-rate and foreign-currency swaps, and option-based derivatives	$	(14,616	)	$	14,545		$	(71	)	$	—		$	(71	)
	Cleared and exchange-traded derivatives	(737		)	737			—			—			—
	Other	(109		)	—			(109		)	—			(109		)
	Total	$	(15,462	)	$	15,282		$	(180	)	$	—		$	(180	)
	-1	For derivatives, includes cash collateral posted or held in excess of exposure.
	-2	Does not include the fair value amount of non-cash collateral posted or held that exceeds the associated net asset or liability presented on the consolidated balance sheets. For cleared and exchange-traded derivatives, does not include non-cash collateral posted by us with an aggregate fair value of $2.3 billion and $0.6 billion as of December 31, 2014 and 2013, respectively.
Table - Collateral in the Form of Securities Pledged	Table 10.2 — Collateral in the Form of Securities Pledged
		31-Dec-14			31-Dec-13
		(in millions)
	Securities pledged with the ability for the secured party to repledge:
	Debt securities of consolidated trusts held by third parties(1)	$	2,539		$	10,654
	Available-for-sale securities	9			70
	Trading securities	1,884			365
	Total securities pledged	$	4,432		$	11,089
	-1	Represents PCs held by us in our Investments segment mortgage investments portfolio and pledged as collateral which are recorded as a reduction to debt securities of consolidated trusts held by third parties on our consolidated balance sheets.

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Table - Changes in AOCI by Component, Net of Tax	Table 11.1 — Changes in AOCI by Component, Net of Tax
		Year Ended December 31, 2014
		AOCI Related				AOCI Related				AOCI Related				Total
		to Available-				to Cash Flow				to Defined
		For-Sale				Hedge				Benefit Plans
		Securities				Relationships
		(in millions)
	Beginning balance	$	962			$	(1,000	)		$	32			$	(6	)
	Other comprehensive income before reclassifications(1)	2,087				—				(43		)		2,044
	Amounts reclassified from accumulated other comprehensive income	(503		)		197				(2		)		(308		)
	Changes in AOCI by component	1,584				197				(45		)		1,736
	Ending balance	$	2,546			$	(803	)		$	(13	)		$	1,730
		Year Ended December 31, 2013
		AOCI Related				AOCI Related				AOCI Related				Total
		to Available-				to Cash Flow				to Defined
		For-Sale				Hedge				Benefit Plans
		Securities				Relationships
		(in millions)
	Beginning balance	$	(1,444	)		$	(1,316	)		$	(178	)		$	(2,938	)
	Other comprehensive income before reclassifications(1)	2,659				—				169				2,828
	Amounts reclassified from accumulated other comprehensive income	(253		)		316				41				104
	Changes in AOCI by component	2,406				316				210				2,932
	Ending balance	$	962			$	(1,000	)		$	32			$	(6	)
	-1	For the years ended December 31, 2014 and 2013, net of tax expense of $1.1 billion and $1.4 billion, respectively, for AOCI related to available-for-sale securities.
Table - Reclassifications from AOCI to Net Income	Table 11.2 — Reclassifications from AOCI to Net Income
	Details about Accumulated Other		Three Months Ended December 31,								Year Ended December 31,								Affected Line Item in the Consolidated
	Comprehensive Income Components																		Statements of Comprehensive Income
			2014				2013				2014				2013
			(in millions)
	AOCI related to available-for-sale  securities
			$	500			$	717			$	1,712			$	1,899			Other gains (losses) on investment securities recognized in earnings
			(251		)		(1,297		)		(938		)		(1,510		)		Net impairment of available-for-sale securities recognized in earnings
			249				(580		)		774				389				Total before tax
			(87		)		203				(271		)		(136		)		Tax (expense) or benefit
			162				(377		)		503				253				Net of tax
	AOCI related to cash flow hedge relationships
			—				—				(2		)		(5		)		Interest expense — Other debt
			(71		)		(95		)		(301		)		(455		)		Expense related to derivatives
			(71		)		(95		)		(303		)		(460		)		Total before tax
			25				29				106				144				Tax (expense) or benefit
			(46		)		(66		)		(197		)		(316		)		Net of tax
	AOCI related to defined benefit plans
			1				8				4				2				Salaries and employee benefits
			(1		)		(43		)		(2		)		(43		)		Tax (expense) or benefit
			—				(35		)		2				(41		)		Net of tax
	Total reclassifications in the period		$	116			$	(478	)		$	308			$	(104	)		Net of tax
Table - Senior Preferred Stock	Table 11.3 — Senior Preferred Stock
	Draw Date		Shares			Shares			Total				Initial				Total
			Authorized			Outstanding			Par Value				Liquidation				Liquidation
													Preference				Preference
													Price per Share
			(in millions, except initial liquidation preference price per share)
	8-Sep-08		1			1			$	1			$	1,000			$	1,000
	24-Nov-08		—			—			—				N/A				13,800
	31-Mar-09		—			—			—				N/A				30,800
	30-Jun-09		—			—			—				N/A				6,100
	30-Jun-10		—			—			—				N/A				10,600
	30-Sep-10		—			—			—				N/A				1,800
	30-Dec-10		—			—			—				N/A				100
	31-Mar-11		—			—			—				N/A				500
	30-Sep-11		—			—			—				N/A				1,479
	30-Dec-11		—			—			—				N/A				5,992
	30-Mar-12		—			—			—				N/A				146
	29-Jun-12		—			—			—				N/A				19
	Total, senior preferred stock		1			1			$	1							$	72,336
Table - Preferred Stock	Table 11.4 — Preferred Stock
		Issue Date	Shares		Shares		Total			Redemption			Total			Redeemable	OTCQB
			Authorized		Outstanding		Par Value			Price per			Outstanding			On or After	Symbol
										Share			Balance
	Preferred stock:		(in millions, except redemption price per share)
	1996 Variable-rate(1)	26-Apr-96	5		5		$	5		$	50		$	250		30-Jun-01	FMCCI
	5.81%	27-Oct-97	3		3		3			50			150			27-Oct-98	-2
	5%	23-Mar-98	8		8		8			50			400			31-Mar-03	FMCKK
	1998 Variable-rate(3)	September 23 and 29, 1998	4.4		4.4		4.4			50			220			30-Sep-03	FMCCG
	5.10%	23-Sep-98	8		8		8			50			400			30-Sep-03	FMCCH
	5.30%	28-Oct-98	4		4		4			50			200			30-Oct-00	-2
	5.10%	19-Mar-99	3		3		3			50			150			31-Mar-04	-2
	5.79%	21-Jul-99	5		5		5			50			250			30-Jun-09	FMCCK
	1999 Variable-rate(4)	5-Nov-99	5.75		5.75		5.75			50			287			31-Dec-04	FMCCL
	2001 Variable-rate(5)	26-Jan-01	6.5		6.5		6.5			50			325			31-Mar-03	FMCCM
	2001 Variable-rate(6)	23-Mar-01	4.6		4.6		4.6			50			230			31-Mar-03	FMCCN
	5.81%	23-Mar-01	3.45		3.45		3.45			50			173			31-Mar-11	FMCCO
	6%	30-May-01	3.45		3.45		3.45			50			173			30-Jun-06	FMCCP
	2001 Variable-rate(7)	30-May-01	4.02		4.02		4.02			50			201			30-Jun-03	FMCCJ
	5.70%	30-Oct-01	6		6		6			50			300			31-Dec-06	FMCKP
	5.81%	29-Jan-02	6		6		6			50			300			31-Mar-07	-2
	2006 Variable-rate(8)	17-Jul-06	15		15		15			50			750			30-Jun-11	FMCCS
	6.42%	17-Jul-06	5		5		5			50			250			30-Jun-11	FMCCT
	5.90%	16-Oct-06	20		20		20			25			500			30-Sep-11	FMCKO
	5.57%	16-Jan-07	44		44		44			25			1,100			31-Dec-11	FMCKM
	5.66%	16-Apr-07	20		20		20			25			500			31-Mar-12	FMCKN
	6.02%	24-Jul-07	20		20		20			25			500			30-Jun-12	FMCKL
	6.55%	28-Sep-07	20		20		20			25			500			30-Sep-17	FMCKI
	2007 Fixed-to-floating rate(9)	4-Dec-07	240		240		240			25			6,000			31-Dec-12	FMCKJ
	Total, preferred stock		464.17		464.17		$	464.17					$	14,109
	-1	Dividend rate resets quarterly and is equal to the sum of three-month LIBOR plus 1% divided by 1.377, and is capped at 9.00%.
	-2	Issued through private placement.
	-3	Dividend rate resets quarterly and is equal to the sum of three-month LIBOR plus 1% divided by 1.377, and is capped at 7.50%.
	-4	Dividend rate resets on January 1 every five years after January 1, 2005 based on a five-year Constant Maturity Treasury rate, and is capped at 11.00%. Optional redemption on December 31, 2004 and on December 31 every five years thereafter.
	-5	Dividend rate resets on April 1 every two years after April 1, 2003 based on the two-year Constant Maturity Treasury rate plus 0.10%, and is capped at 11.00%. Optional redemption on March 31, 2003 and on March 31 every two years thereafter.
	-6	Dividend rate resets on April 1 every year based on 12-month LIBOR minus 0.20%, and is capped at 11.00%. Optional redemption on March 31, 2003 and on March 31 every year thereafter.
	-7	Dividend rate resets on July 1 every two years after July 1, 2003 based on the two-year Constant Maturity Treasury rate plus 0.20%, and is capped at 11.00%. Optional redemption on June 30, 2003 and on June 30 every two years thereafter.
	-8	Dividend rate resets quarterly and is equal to the sum of three-month LIBOR plus 0.50% but not less than 4.00%.
	-9	Dividend rate is set at an annual fixed rate of 8.375% from December 4, 2007 through December 31, 2012. For the period beginning on or after January 1, 2013, dividend rate resets quarterly and is equal to the higher of: (a) the sum of three-month LIBOR plus 4.16% per annum; or (b) 7.875% per annum. Optional redemption on December 31, 2012, and on December 31 every five years thereafter.

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Table - Federal Income Tax (Expense) Benefit	Table 12.1 — Federal Income Tax (Expense) Benefit
		Year Ended December 31,
		2014			2013				2012
		(in millions)
	Current income tax (expense) benefit	$	(1,028	)	$	(117	)		$	1,540
	Deferred income tax (expense) benefit	(2,284		)	23,422				(3		)
	Total income tax (expense) benefit	$	(3,312	)	$	23,305			$	1,537
Table - Reconciliation of Statutory to Effective Tax Rate	Table 12.2 — Reconciliation of Statutory to Effective Tax Rate
		Year Ended December 31,
		2014						2013						2012
		Amount			Percent			Amount				Percent		Amount			Percent
		(dollars in millions)
	Statutory corporate tax rate	$	(3,851	)	35	%		$	(8,877	)		35	%	$	(3,306	)	35	%
	Tax-exempt interest	73			(0.7	)		101				(0.4	)	133			(1.4	)
	Tax credits	438			(4.0	)		495				(2.0	)	536			(5.7	)
	Valuation allowance:
	Current year activity	—			—			5,156				(20.3	)	2,637			(27.9	)
	Release of valuation allowance	—			—			26,369				(104.0	)	—			—
	Unrecognized tax benefits	—			—			—				—		1,205			(12.8	)
	Other	—			—			138				(0.5	)	45			(0.5	)
	Total valuation allowance	—			—			31,663				(124.8	)	3,887			(41.2	)
	Other	28			(0.2	)		(77		)		0.3		287			(3.0	)
	Effective tax rate	$	(3,312	)	30.1	%		$	23,305			(91.9	)%	$	1,537		(16.3	)%
Table - Deferred Tax Assets and Liabilities	Table 12.3 — Deferred Tax Assets and Liabilities
		2014			2013
		(in millions)
	Deferred tax assets:
	Deferred fees	$	6,245		$	5,035
	Basis differences related to derivative instruments	7,059			6,946
	Credit related items and allowance for loan losses	2,311			3,648
	Basis differences related to assets held for investment(1)	1,902			—
	LIHTC and AMT credit carryforward	3,465			3,997
	Net operating loss carryforward	—			3,978
	Other items, net	10			40
	Total deferred tax assets	20,992			23,644
	Deferred tax liabilities:
	Basis differences related to assets held for investment(1)	—			(375		)
	Unrealized gains related to available-for-sale securities	(1,371		)	(518		)
	Basis differences related to debt	(123		)	(35		)
	Total deferred tax liabilities	(1,494		)	(928		)
	Deferred tax assets, net	$	19,498		$	22,716
	-1	Includes a basis adjustment on seriously delinquent loans, which offsets a portion of the deferred tax asset for credit related items and the allowance for loan losses.

Segment_Reporting_Tables

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Table - Summary of Segment Earnings and Comprehensive Income (Loss)	Table 13.1 — Summary of Segment Earnings and Comprehensive Income (Loss)
		Year Ended December 31,
		2014			2013			2012
		(in millions)
	Segment Earnings (loss), net of taxes:
	Single-family Guarantee	$	1,547		$	5,796		$	(164	)
	Investments	4,520			15,930			7,367
	Multifamily	1,636			3,050			2,991
	All Other	(13		)	23,892			788
	Total Segment Earnings, net of taxes	7,690			48,668			10,982
	Net income	$	7,690		$	48,668		$	10,982
	Comprehensive income (loss) of segments:
	Single-family Guarantee	$	1,537		$	5,845		$	(227	)
	Investments	6,471			20,287			11,397
	Multifamily	1,459			1,455			4,081
	All Other	(41		)	24,013			788
	Comprehensive income of segments	9,426			51,600			16,039
	Comprehensive income	$	9,426		$	51,600		$	16,039
Table - Segment Earnings and Reconciliation to GAAP Results	Table 13.2 — Segment Earnings and Reconciliation to GAAP Results
		Year Ended December 31, 2014
														Total Segment			Reconciliation to Consolidated Statements of									Total per
														Earnings (Loss),			Comprehensive Income									Consolidated
														Net of Tax												Statements of
																										Comprehensive
		Single-family			Investments			Multifamily			All						Reclassifications			Segment			Total			Income
		Guarantee									Other									Adjustments			Reconciling
																							Items
		(in millions)
	Net interest income	$	(111	)	$	2,966		$	948		$	—		$	3,803		$	9,825		$	635		$	10,460		$	14,263
	(Provision) benefit for credit losses	(982		)	—			55			—			(927		)	869			—			869			(58		)
	Non-interest income (loss):
	Management and guarantee income(1)	5,172			—			254			—			5,426			(4,794		)	(303		)	(5,097		)	329
	Net impairment of available-for-sale securities recognized in earnings	—			(140		)	—			—			(140		)	(798		)	—			(798		)	(938		)
	Derivative gains (losses)	7			(5,158		)	335			—			(4,816		)	(3,475		)	—			(3,475		)	(8,291		)
	Gains (losses) on trading securities	—			(276		)	58			—			(218		)	—			—			—			(218		)
	Gains (losses) on mortgage loans	(139		)	—			870			—			731			—			—			—			731
	Other non-interest income	844			8,881			176			—			9,901			(1,627		)	—			(1,627		)	8,274
	Non-interest expense:
	Administrative expense	(1,170		)	(437		)	(274		)	—			(1,881		)	—			—			—			(1,881		)
	REO operations income (expense)	(205		)	—			9			—			(196		)	—			—			—			(196		)
	Temporary Payroll Tax Cut Continuation Act of 2011 expense	(775		)	—			—			—			(775		)	—			—			—			(775		)
	Other non-interest expense	(191		)	(6		)	(23		)	(18		)	(238		)	—			—			—			(238		)
	Segment adjustments	(303		)	635			—			—			332			—			(332		)	(332		)	—
	Income tax (expense) benefit	(600		)	(1,945		)	(772		)	5			(3,312		)	—			—			—			(3,312		)
	Net income (loss)	1,547			4,520			1,636			(13		)	7,690			—			—			—			7,690
	Changes in unrealized gains (losses) related to available-for-sale securities	—			1,759			(175		)	—			1,584			—			—			—			1,584
	Changes in unrealized gains (losses) related to cash flow hedge relationships	—			197			—			—			197			—			—			—			197
	Changes in defined benefit plans	(10		)	(5		)	(2		)	(28		)	(45		)	—			—			—			(45		)
	Total other comprehensive income (loss), net of taxes	(10		)	1,951			(177		)	(28		)	1,736			—			—			—			1,736
	Comprehensive income (loss)	$	1,537		$	6,471		$	1,459		$	(41	)	$	9,426		$	—		$	—		$	—		$	9,426
		Year Ended December 31, 2013
														Total Segment			Reconciliation to Consolidated Statements of									Total per
														Earnings (Loss),			Comprehensive Income									Consolidated
														Net of Tax												Statements of
																										Comprehensive
		Single-family			Investments			Multifamily			All						Reclassifications			Segment			Total			Income
		Guarantee									Other									Adjustments			Reconciling
																							Items
		(in millions)
	Net interest income	$	320		$	3,525		$	1,186		$	—		$	5,031		$	10,400		$	1,037		$	11,437		$	16,468
	Benefit for credit losses	1,409			—			218			—			1,627			838			—			838			2,465
	Non-interest income (loss):
	Management and guarantee income(1)	4,930			—			206			—			5,136			(4,171		)	(694		)	(4,865		)	271
	Net impairment of available-for-sale securities recognized in earnings	—			(974		)	(15		)	—			(989		)	(521		)	—			(521		)	(1,510		)
	Derivative gains (losses)	(3		)	5,543			1,281			—			6,821			(4,189		)	—			(4,189		)	2,632
	Gains (losses) on trading securities	—			(1,466		)	(132		)	—			(1,598		)	—			—			—			(1,598		)
	Gains (losses) on mortgage loans	—			—			(336		)	—			(336		)	—			—			—			(336		)
	Other non-interest income	1,165			8,902			1,350			—			11,417			(2,357		)	—			(2,357		)	9,060
	Non-interest expense:
	Administrative expense	(1,025		)	(523		)	(257		)	—			(1,805		)	—			—			—			(1,805		)
	REO operations income (expense)	124			—			16			—			140			—			—			—			140
	Temporary Payroll Tax Cut Continuation Act of 2011 expense	(533		)	—			—			—			(533		)	—			—			—			(533		)
	Other non-interest expense (income)	(179		)	349			(24		)	(37		)	109			—			—			—			109
	Segment adjustments	(694		)	1,037			—			—			343			—			(343		)	(343		)	—
	Income tax (expense) benefit	282			(463		)	(443		)	23,929			23,305			—			—			—			23,305
	Net income (loss)	5,796			15,930			3,050			23,892			48,668			—			—			—			48,668
	Changes in unrealized gains (losses) related to available-for-sale securities	—			4,010			(1,604		)	—			2,406			—			—			—			2,406
	Changes in unrealized gains (losses) related to cash flow hedge relationships	—			316			—			—			316			—			—			—			316
	Changes in defined benefit plans	49			31			9			121			210			—			—			—			210
	Total other comprehensive income (loss), net of taxes	49			4,357			(1,595		)	121			2,932			—			—			—			2,932
	Comprehensive income	$	5,845		$	20,287		$	1,455		$	24,013		$	51,600		$	—		$	—		$	—		$	51,600
		Year Ended December 31, 2012
													Total Segment			Reconciliation to Consolidated Statements of									Total per
													Earnings (Loss),			Comprehensive Income									Consolidated
													Net of Tax												Statements of
																									Comprehensive
	Single-family			Investments			Multifamily			All						Reclassifications			Segment			Total			Income
	Guarantee									Other									Adjustments			Reconciling
																						Items
	(in millions)
Net interest income	$	(147	)	$	5,726		$	1,291		$	—		$	6,870		$	9,942		$	799		$	10,741		$	17,611
Benefit (provision) for credit losses	(3,168		)	—			123			—			(3,045		)	1,155			—			1,155			(1,890		)
Non-interest income (loss):
Management and guarantee income(1)	4,389			—			151			—			4,540			(3,507		)	(832		)	(4,339		)	201
Net impairment of available-for-sale securities recognized in earnings	—			(1,831		)	(123		)	—			(1,954		)	(214		)	—			(214		)	(2,168		)
Derivative gains (losses)	—			1,034			943			—			1,977			(4,425		)	—			(4,425		)	(2,448		)
Gains (losses) on trading securities	—			(1,794		)	120			—			(1,674		)	—			—			—			(1,674		)
Gains (losses) on mortgage loans	—			—			1,010			—			1,010			—			—			—			1,010
Other non-interest income	931			2,719			297			—			3,947			(2,951		)	—			(2,951		)	996
Non-interest expense:
Administrative expense	(890		)	(430		)	(241		)	—			(1,561		)	—			—			—			(1,561		)
REO operations income (expense)	(62		)	—			3			—			(59		)	—			—			—			(59		)
Temporary Payroll Tax Cut Continuation Act of 2011 expense	(108		)	—			—			—			(108		)	—			—			—			(108		)
Other non-interest expense	(285		)	(1		)	(129		)	(50		)	(465		)	—			—			—			(465		)
Segment adjustments	(832		)	799			—			—			(33		)	—			33			33			—
Income tax (expense) benefit	8			1,145			(454		)	838			1,537			—			—			—			1,537
Net income (loss)	(164		)	7,367			2,991			788			10,982			—			—			—			10,982
Changes in unrealized gains (losses) related to available-for-sale securities	—			3,666			1,103			—			4,769			—			—			—			4,769
Changes in unrealized gains (losses) related to cash flow hedge relationships	—			414			—			—			414			—			—			—			414
Changes in defined benefit plans	(63		)	(50		)	(13		)	—			(126		)	—			—			—			(126		)
Total other comprehensive income (loss), net of taxes	(63		)	4,030			1,090			—			5,057			—			—			—			5,057
Comprehensive income (loss)	$	(227	)	$	11,397		$	4,081		$	788		$	16,039		$	—		$	—		$	—		$	16,039
-1	Management and guarantee income is included in other income on our GAAP consolidated statements of comprehensive income.

Financial_Guarantees_Tables

Financial Guarantees (Tables)	12 Months Ended
	Dec. 31, 2014
Guarantees [Abstract]
Table - Financial Guarantees	Table 14.1 — Financial Guarantees
		December 31, 2014					31-Dec-13
		Maximum		Recognized		Maximum	Maximum		Recognized		Maximum
		Exposure(1)		Liability(2)		Remaining	Exposure(1)		Liability(2)		Remaining
						Term					Term
		(dollars in millions, terms in years)
	Non-consolidated Freddie Mac securities	$	87,529	$	861	39	$	71,809	$	731	40
	Other guarantee commitments	26,147		772		39	29,160		791		36
	Derivative instruments	21,336		154		31	9,856		239		32
	-1	The maximum exposure represents the contractual amounts that could be lost if counterparties or borrowers defaulted, without consideration of possible recoveries under credit enhancement arrangements, such as recourse provisions, third-party insurance contracts, or from collateral held or pledged. The maximum exposure disclosed above is not representative of the actual loss we are likely to incur, based on our historical loss experience and after consideration of proceeds from related collateral liquidation. The maximum exposure for our liquidity guarantees is not mutually exclusive of our default guarantees on the same securities; therefore, these amounts are included within the maximum exposure of non-consolidated Freddie Mac securities and other guarantee commitments.
	-2	For non-consolidated Freddie Mac securities and other guarantee commitments, this amount represents the guarantee obligation on our consolidated balance sheets. This amount excludes our reserve for guarantee losses, which totaled $126 million and $111 million as of December 31, 2014 and 2013, respectively, and is included within other liabilities on our consolidated balance sheets.

Concentration_of_Credit_and_Ot1

Concentration of Credit and Other Risks (Tables)	12 Months Ended
	Dec. 31, 2014
Risks and Uncertainties [Abstract]
Table - Concentration of Credit Risk	Table 15.1 — Concentration of Credit Risk — Single-Family Credit Guarantee Portfolio
		31-Dec-14					31-Dec-13						Percent of Credit Losses(1) Twelve Months Ended
		Percentage  of		Serious			Percentage  of			Serious			31-Dec-14		31-Dec-13
		Portfolio(1)		Delinquency			Portfolio(1)			Delinquency
				Rate						Rate
	Year of Origination
	2014	12	%	0.02	%		N/A			N/A			—	%	N/A
	2013	16		0.06			16	%		0.01	%		—		—	%
	2012	14		0.09			16			0.04			—		—
	2011	6		0.26			8			0.18			—		—
	2010	6		0.46			7			0.39			1		1
	2009	6		0.92			7			0.88			2		2
	Subtotal - New single-family book	60		0.24			54			0.24			3		3
	HARP and other relief refinance loans(2)	20		0.75			21			0.64			8		7
	2005 to 2008 Legacy single-family book	13		7.59			16			8.77			81		81
	Pre-2005 Legacy single-family book	7		3.1			9			3.24			8		9
	Total	100	%	1.88	%		100	%		2.39	%		100	%	100	%
	Region(3)
	West	29	%	1.23	%		28	%		1.73	%		13	%	24	%
	Northeast	26		2.81			26			3.23			26		15
	North Central	17		1.48			18			1.81			22		23
	Southeast	16		2.4			16			3.42			35		35
	Southwest	12		1.16			12			1.36			4		3
	Total	100	%	1.88	%		100	%		2.39	%		100	%	100	%
	State
	Arizona, California, Florida, and Nevada(4)	26	%	1.91	%		26	%		3.01	%		36	%	47	%
	Illinois, Michigan, and Ohio(5)	10		1.7			11			2.11			17		19
	New York and New Jersey(6)	9		4.62			9			5.11			11		3
	All other	55		1.53			54			1.85			36		31
	Total	100	%	1.88	%		100	%		2.39	%		100	%	100	%
	-1	Within these columns, "—" represents less than 0.5%.
	-2	HARP and other relief refinance loans are presented separately rather than in the year that the refinancing occurred (from 2009 to 2014). All other refinance loans are presented in the year that the refinancing occurred.
	-3	Region designation: West (AK, AZ, CA, GU, HI, ID, MT, NV, OR, UT, WA); Northeast (CT, DE, DC, MA, ME, MD, NH, NJ, NY, PA, RI, VT, VA, WV); North Central (IL, IN, IA, MI, MN, ND, OH, SD, WI); Southeast (AL, FL, GA, KY, MS, NC, PR, SC, TN, VI); Southwest (AR, CO, KS, LA, MO, NE, NM, OK, TX, WY).
	-4	Represents the four states that had the largest cumulative declines in home prices during the housing crisis that began in 2006, as measured using Freddie Mac’s home price index.
	-5	Represents selected states in the North Central region that have experienced adverse economic conditions since 2006.
	-6	Represents two states with a judicial foreclosure process in which there are a significant number of seriously delinquent loans within our single-family credit guarantee portfolio.
	Table 15.3 — Concentration of Credit Risk — Multifamily Mortgage Portfolio
		31-Dec-14						31-Dec-13
		UPB			Delinquency			UPB				Delinquency
					Rate(1)							Rate(1)
		(dollars in billions)
	State(2)
	California	$	23.2		—	%		$	22.4			0.03	%
	Texas	18.3			0.06			16.7				0.02
	New York	12.1			—			11.4				0.12
	Florida	10			—			9.3				0.28
	Virginia	7.3			—			7				0.37
	Maryland	7.2			—			6.7				—
	All other states	65.2			0.07			59.3				0.08
	Total	$	143.3		0.04	%		$	132.8			0.09	%
	Region(3)
	Northeast	$	39		—	%		$	37.5			0.1	%
	West	36.3			—			33.8				0.07
	Southwest	29.1			0.07			26.2				0.05
	Southeast	26.7			0.09			24.1				0.16
	North Central	12.2			0.06			11.2				0.07
	Total	$	143.3		0.04	%		$	132.8			0.09	%
	Other Categories(4)
	Original LTV ratio greater than 80%	$	6.1		0.04	%		$	5.6			0.19	%
	Original DSCR below 1.10	2.1			—			2.2				—
	-1	Based on mortgages two monthly payments or more delinquent or in foreclosure.
	-2	States presented have the highest aggregate UPB at December 31, 2014.
	-3	See endnote (3) to “Table 15.1 — Concentration of Credit Risk — Single-Family Credit Guarantee Portfolio” for a description of these regions.
	-4	These categories are not mutually exclusive and a loan in one category may also be included within another category.
Certain Higher Risk Categories In The Single Family Credit Guarantee Portfolio [Table Text Block]	Table 15.2 — Certain Higher-Risk Categories in the Single-Family Credit Guarantee Portfolio(1)
		Percentage of Portfolio(2)					Serious Delinquency Rate
		31-Dec-14		31-Dec-13			31-Dec-14			31-Dec-13
	Interest-only	2	%	2	%		9.36	%		12.51	%
	Option ARM(3)	—		—			9.87			12.3
	Alt-A	3		3			8.53			10.06
	Original LTV ratio greater than 90%(4)	16		16			2.58			3.22
	Lower credit scores at origination (less than 620)	3		3			8.57			9.99
	-1	Excludes loans underlying certain Other Guarantee Transactions for which data was not available.
	-2	Within these columns, "—" represents less than 0.5%.
	-3	For reporting purposes, loans within the option ARM category continue to be reported in that category following modification, even though the modified loan no longer provides for optional payment provisions.
	-4	Includes HARP loans, which we are required to purchase as part of our participation in the MHA Program.

Fair_Value_Disclosures_Tables

Fair Value Disclosures (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Table - Assets and Liabilities on Our Consolidated Balance Sheets Measured at Fair Value on a Recurring Basis	Table 16.1 — Assets and Liabilities on Our Consolidated Balance Sheets Measured at Fair Value on a Recurring Basis
		December 31, 2014
		Level 1			Level 2			Level 3			Netting				Total
											Adjustment(1)
		(in millions)
	Assets:
	Investments in securities:
	Available-for-sale, at fair value:
	Mortgage-related securities:
	Freddie Mac	$	—		$	34,868		$	4,231		$	—			$	39,099
	Fannie Mae	—			11,228			85			—				11,313
	Ginnie Mae	—			195			4			—				199
	CMBS	—			18,348			3,474			—				21,822
	Subprime	—			—			20,589			—				20,589
	Option ARM	—			—			5,649			—				5,649
	Alt-A and other	—			16			5,027			—				5,043
	Obligations of states and political subdivisions	—			—			2,198			—				2,198
	Manufactured housing	—			—			638			—				638
	Total available-for-sale securities, at fair value	—			64,655			41,895			—				106,550
	Trading, at fair value:
	Mortgage-related securities:
	Freddie Mac	—			16,542			927			—				17,469
	Fannie Mae	—			5,867			232			—				6,099
	Ginnie Mae	—			15			1			—				16
	Other	—			167			4			—				171
	Total mortgage-related securities	—			22,591			1,164			—				23,755
	U.S. Treasury securities	6,682			—			—			—				6,682
	Total trading securities, at fair value	6,682			22,591			1,164			—				30,437
	Total investments in securities	6,682			87,246			43,059			—				136,987
	Mortgage loans:
	Held-for-sale, at fair value	—			12,130			—			—				12,130
	Derivative assets, net:
	Interest-rate swaps	—			5,653			—			—				5,653
	Option-based derivatives	5			4,219			—			—				4,224
	Other	—			40			27			—				67
	Subtotal, before netting adjustments	5			9,912			27			—				9,944
	Netting adjustments(1)	—			—			—			(9,122		)		(9,122		)
	Total derivative assets, net	5			9,912			27			(9,122		)		822
	Other assets:
	Guarantee asset, at fair value	—			—			1,626			—				1,626
	All other, at fair value	—			—			5			—				5
	Total other assets	—			—			1,631			—				1,631
	Total assets carried at fair value on a recurring basis	$	6,687		$	109,288		$	44,717		$	(9,122	)		$	151,570
	Liabilities:
	Debt securities of consolidated trusts held by third parties, at fair value	$	—		$	42		$	—		$	—			$	42
	Other debt, at fair value	—			5,820			—			—				5,820
	Derivative liabilities, net:
	Interest-rate swaps	—			13,316			—			—				13,316
	Option-based derivatives	28			99			—			—				127
	Other	—			80			37			—				117
	Subtotal, before netting adjustments	28			13,495			37			—				13,560
	Netting adjustments(1)	—			—			—			(11,597		)		(11,597		)
	Total derivative liabilities, net	28			13,495			37			(11,597		)		1,963
	Total liabilities carried at fair value on a recurring basis	$	28		$	19,357		$	37		$	(11,597	)		$	7,825
		Fair Value at December 31, 2013
		Level 1			Level 2			Level 3			Netting				Total
											Adjustment(1)
		(in millions)
	Assets:
	Investments in securities:
	Available-for-sale, at fair value:
	Mortgage-related securities:
	Freddie Mac	$	—		$	38,720		$	1,939		$	—			$	40,659
	Fannie Mae	—			10,666			131			—				10,797
Ginnie Mae	—			155			12			—				167
CMBS	—			27,229			3,109			—				30,338
Subprime	—			—			27,499			—				27,499
Option ARM	—			—			6,574			—				6,574
Alt-A and other	—			—			8,706			—				8,706
Obligations of states and political subdivisions	—			—			3,495			—				3,495
Manufactured housing	—			—			684			—				684
Total available-for-sale securities, at fair value	—			76,770			52,149			—				128,919
Trading, at fair value:
Mortgage-related securities:
Freddie Mac	—			9,006			343			—				9,349
Fannie Mae	—			6,959			221			—				7,180
Ginnie Mae	—			24			74			—				98
Other	—			133			8			—				141
Total mortgage-related securities	—			16,122			646			—				16,768
U.S. Treasury securities	6,636			—			—			—				6,636
Total trading securities, at fair value	6,636			16,122			646			—				23,404
Total investments in securities	6,636			92,892			52,795			—				152,323
Mortgage loans:
Held-for-sale, at fair value	—			8,727			—			—				8,727
Derivative assets, net:
Interest-rate swaps	—			10,009			10			—				10,019
Option-based derivatives	—			4,112			—			—				4,112
Other	—			99			1			—				100
Subtotal, before netting adjustments	—			14,220			11			—				14,231
Netting adjustments(1)	—			—			—			(13,168		)		(13,168		)
Total derivative assets, net	—			14,220			11			(13,168		)		1,063
Other assets:
Guarantee asset, at fair value	—			—			1,611			—				1,611
All other, at fair value	—			—			9			—				9
Total other assets	—			—			1,620			—				1,620
Total assets carried at fair value on a recurring basis	$	6,636		$	115,839		$	54,426		$	(13,168	)		$	163,733
Liabilities:
Debt securities of consolidated trusts held by third parties, at fair value	$	—		$	59		$	—		$	—			$	59
Other debt, at fair value	—			1,155			1,528			—				2,683
Derivative liabilities, net:
Interest-rate swaps	—			13,022			295			—				13,317
Option-based derivatives	—			201			3			—				204
Other	—			68			38			—				106
Subtotal, before netting adjustments	—			13,291			336			—				13,627
Netting adjustments(1)	—			—			—			(13,447		)		(13,447		)
Total derivative liabilities, net	—			13,291			336			(13,447		)		180
Total liabilities carried at fair value on a recurring basis	$	—		$	14,505		$	1,864		$	(13,447	)		$	2,922
-1	Represents counterparty netting, cash collateral netting and net derivative interest receivable or payable. The net cash collateral posted was $3.2 billion and $871 million, respectively, at December 31, 2014 and 2013. The net interest receivable (payable) of derivative assets and derivative liabilities was $(0.7) billion and $(0.6) billion at December 31, 2014 and 2013, respectively, which was mainly related to interest rate swaps.
Table - Assets and Liabilities on Our Consolidated Balance Sheets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs	Table 16.2 — Assets and Liabilities on Our Consolidated Balance Sheets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs
		Year Ended December 31, 2014
					Realized and unrealized gains (losses)
		Balance,			Included in			Included in			Total				Purchases			Issues		Sales			Settlements,			Transfers		Transfers			Balance,		Unrealized
		January 1,			earnings(1)			other															net			into		out of			December 31,		gains (losses)
		2014						comprehensive																		Level 3(2)		Level 3(2)			2014		still held
								income(1)
		in millions
	Assets
	Investments in securities:
	Available-for-sale, at fair value:
	Mortgage-related securities:
	Freddie Mac	$	1,939		$	2		$	71		$	73			$	5,742		$	—	$	(3,346	)	$	(138	)	$	3	$	(42	)	$	4,231	$	—
	Fannie Mae	131			—			(2		)	(2		)		48			—		(59		)	(29		)	45		(49		)	85		—
	Ginnie Mae	12			—			—			—				—			—		(6		)	(3		)	1		—			4		—
	CMBS	3,109			—			397			397				—			—		(1		)	(31		)	—		—			3,474		—
	Subprime	27,499			(524		)	2,778			2,254				—			—		(7,469		)	(1,695		)	—		—			20,589		(794		)
	Option ARM	6,574			(71		)	232			161				—			—		(791		)	(295		)	—		—			5,649		(102		)
	Alt-A and other	8,706			111			158			269				—			—		(3,659		)	(272		)	—		(17		)	5,027		(42		)
	Obligations of states and political subdivisions	3,495			1			71			72				1			—		(13		)	(1,357		)	—		—			2,198		—
	Manufactured housing	684			—			28			28				—			—		—			(74		)	—		—			638		—
	Total available-for-sale mortgage-related securities	52,149			(481		)	3,733			3,252				5,791			—		(15,344		)	(3,894		)	49		(108		)	41,895		(938		)
	Trading, at fair value:
	Mortgage-related securities:
	Freddie Mac	343			8			—			8				2,282			95		(1,690		)	(43		)	—		(68		)	927		11
	Fannie Mae	221			(45		)	—			(45		)		79			—		—			(14		)	21		(30		)	232		(45		)
	Ginnie Mae	74			—			—			—				1			—		(70		)	(4		)	—		—			1		(2		)
	Other	8			(1		)	—			(1		)		—			—		—			(3		)	—		—			4		(1		)
	Total trading mortgage-related securities	646			(38		)	—			(38		)		2,362			95		(1,760		)	(64		)	21		(98		)	1,164		(37		)
	Other assets:
	Guarantee asset(3)	1,611			(184		)	—			(184		)		—			427		—			(228		)	—		—			1,626		(263		)
	All other, at fair value	9			(4		)	—			(4		)		—			—		—			—			—		—			5		(4		)
	Total other assets	1,620			(188		)	—			(188		)		—			427		—			(228		)	—		—			1,631		(267		)
					Realized and unrealized (gains) losses
		Balance,			Included in			Included in			Total				Purchases			Issues		Sales			Settlements,			Transfers		Transfers			Balance,		Unrealized
		January 1,			earnings(1)			other															net			into		out of			December 31,		(gains)
		2014						comprehensive																		Level 3(2)		Level 3(2)			2014		losses
								income(1)																									still held
		(in millions)
	Liabilities
	Other debt, at fair value	$	1,528		$	(7	)	$	—		$	(7	)		$	—		$	—	$	—		$	(1,521	)	$	—	$	—		$	—	$	—
	Net derivatives(4)	325			(94		)	—			(94		)		—			—		—			60			—		(281		)	10		(30		)
		Year Ended December 31, 2013
					Realized and unrealized gains (losses)
		Balance,			Included in			Included in			Total				Purchases			Issues		Sales			Settlements,			Transfers		Transfers			Balance,		Unrealized
		January 1,			earnings(1)			other															net			into		out of			December 31,		gains (losses)
		2013						comprehensive																		Level 3		Level 3			2013		still held
								income(1)
		(in millions)
	Assets
	Investments in securities:
	Available-for-sale, at fair value:
	Mortgage-related securities:
	Freddie Mac	$	1,802		$	2		$	109		$	111			$	239		$	—	$	(86	)	$	(152	)	$	25	$	—		$	1,939	$	—
	Fannie Mae	163			—			(3		)	(3		)		—			—		—			(29		)	—		—			131		—
	Ginnie Mae	16			—			—			—				—			—		—			(4		)	—		—			12		—
	CMBS	3,429			6			(266		)	(260		)		—			—		(36		)	(24		)	—		—			3,109		—
	Subprime	26,457			(1,260		)	6,648			5,388				—			—		(403		)	(3,943		)	—		—			27,499		(1,258		)
	Option ARM	5,717			(61		)	1,694			1,633				—			—		(75		)	(701		)	—		—			6,574		(58		)
	Alt-A and other	10,904			(128		)	1,341			1,213				—			—		(2,001		)	(1,410		)	—		—			8,706		(179		)
	Obligations of states and political subdivisions	5,798			13			(188		)	(175		)		(10		)	—		(533		)	(1,585		)	—		—			3,495		—
	Manufactured housing	709			(1		)	62			61				—			—		—			(86		)	—		—			684		(1		)
	Total available-for-sale mortgage-related securities	54,995			(1,429		)	9,397			7,968				229			—		(3,134		)	(7,934		)	25		—			52,149		(1,496		)
	Trading, at fair value:
Mortgage-related securities:
Freddie Mac	1,165			(50		)	—			(50		)		1,271			269		(1,476		)	(64		)	1		(773		)	343		(53		)
Fannie Mae	312			(42		)	—			(42		)		2			—		(2		)	(25		)	43		(67		)	221		(42		)
Ginnie Mae	92			(1		)	—			(1		)		3			—		—			(15		)	—		(5		)	74		(1		)
Other	21			—			—			—				—			—		—			(3		)	—		(10		)	8		—
Total trading mortgage-related securities	1,590			(93		)	—			(93		)		1,276			269		(1,478		)	(107		)	44		(855		)	646		(96		)
Mortgage Loans
Held-for-sale, at fair value(5)	14,238			—			—			—				—			—		—			—			—		(14,238		)	—		—
Other assets:
Guarantee asset(3)	1,029			4			—			4				—			688		—			(110		)	—		—			1,611		4
All other, at fair value	114			30			—			30				—			—		(135		)	—			—		—			9		7
Total other assets	1,143			34			—			34				—			688		(135		)	(110		)	—		—			1,620		11
				Realized and unrealized (gains) losses
	Balance,			Included in			Included in			Total				Purchases			Issues		Sales			Settlements,			Transfers		Transfers			Balance,		Unrealized
	January 1,			earnings(1)			other															net			into		out of			December 31,		(gains)
	2013						comprehensive																		Level 3		Level 3			2013		losses
							income(1)																									still held
	(in millions)
Liabilities
Other debt, at fair value	$	2,187		$	11		$	—		$	11			$	—		$	1,130	$	—		$	(670	)	$	—	$	(1,130	)	$	1,528	$	4
Net derivatives(4)	47			301			—			301				—			12		—			(35		)	—		—			$	325	274
-1	Changes in fair value for available-for-sale securities are recorded in AOCI, while gains and losses from sales are recorded in other gains (losses) on investment securities recognized in earnings on our consolidated statements of comprehensive income. For mortgage-related securities classified as trading, the realized and unrealized gains (losses) are recorded in other gains (losses) on investment securities recognized in earnings on our consolidated statements of comprehensive income.
-2	Transfers out of Level 3 during the year ended December 31, 2014 consist primarily of certain mortgage-related securities and certain derivatives due to an increased volume and level of activity in the market and availability of price quotes from dealers and third-party pricing services. Transfers into Level 3 during the year ended December 31, 2014 consist primarily of certain mortgage-related securities due to a lack of market activity and relevant price quotes from dealers and third-party pricing services.
-3	Changes in fair value of the guarantee asset are recorded in other income on our consolidated statements of comprehensive income.
-4	Amounts are prior to counterparty netting, cash collateral netting, net trade/settle receivable or payable and net derivative interest receivable or payable.
-5	For held-for-sale mortgage loans with the fair value option elected, gains (losses) on fair value changes and from sales of mortgage loans are recorded in other income on our consolidated statements of comprehensive income.
Table - Assets on Our Consolidated Balance Sheets Measured at Fair Value on a Non-Recurring Basis	Table 16.3 — Assets on Our Consolidated Balance Sheets Measured at Fair Value on a Non-Recurring Basis
		December 31,
		2014													2013
		Level 1			Level 2			Level 3			Total				Level 1			Level 2		Level 3			Total
		(in millions)
	Assets measured at fair value on a non-recurring basis:
	Mortgage loans(1)	$	—		$	80		$	8,962		$	9,042			$	—		$	—	$	515		$	515
	REO, net(2)	—			—			1,665			1,665				—			—		1,837			1,837
	Total assets measured at fair value on a non-recurring basis	$	—		$	80		$	10,627		$	10,707			$	—		$	—	$	2,352		$	2,352
	-1	Includes impaired single-family and multifamily mortgage loans that are classified as held-for-investment and have a related valuation allowance based on the fair value of the underlying collateral and held-for-sale multifamily mortgage loans where the fair value is below cost.
	-2	Represents the fair value of foreclosed properties that were measured at fair value subsequent to their initial classification as REO, net. The carrying amount of REO, net was written down to fair value of $1.7 billion, less estimated costs to sell of $109 million (or approximately $1.6 billion) at December 31, 2014. The carrying amount of REO, net was written down to fair value of $1.8 billion, less estimated costs to sell of $118 million (or approximately $1.7 billion) at December 31, 2013.
Table - Quantitative Information about Recurring Level 3 Fair Value Measurements	Table 16.4 — Quantitative Information about Recurring Level 3 Fair Value Measurements
		31-Dec-14
		Total			Level  3			Predominant		Unobservable Inputs
		Fair			Fair			Valuation
		Value			Value			Technique(s)		Type	Range		Weighted
													Average
		(dollars in millions)
	Recurring fair value measurements
	Assets
	Investments in securities
	Available-for-sale, at fair value
	Mortgage-related securities
	Freddie Mac				$	2,980		Discounted cash flows		OAS	(146) - 144 bps		83 bps
					375			Risk metric		Effective duration(1)	0.18 - 7.54 years		3.82 years
					143			Median of external sources		External pricing sources	$103.2 - $104.4		$	103.8
					733			Other
	Total Freddie Mac	$	39,099		4,231
	Fannie Mae				47			Median of external sources
					29			Discounted cash flows
					9			Other
	Total Fannie Mae	11,313			85
	Ginnie Mae				4			Discounted cash flows
	Total Ginnie Mae	199			4
	CMBS				2,726			Risk Metrics		Effective duration(1)	5.84 - 10.65 years		9.59 years
					748			Discounted cash flows		OAS	181 -766 bps		421 bps
	Total CMBS	21,822			3,474
	Subprime, option ARM, and Alt-A:
	Subprime				18,789			Median of external sources		External pricing sources	$71.0 - $76.1		$	73.5
					1,800			Other
	Total subprime	20,589			20,589
	Option ARM				5,205			Median of external sources		External pricing sources	$65.3 - $70.9		$	67.9
					444			Other
	Total option ARM	5,649			5,649
	Alt-A and other				4,116			Median of external sources		External pricing sources	$83.0 - $86.2		$	84.5
					911			Other
	Total Alt-A and other	5,043			5,027
	Obligations of states and political subdivisions				1,992			Median of external sources		External pricing sources	$101.3 - $101.9		$	101.6
					206			Other
	Total obligations of states and political subdivisions	2,198			2,198
	Manufactured housing				515			Median of external sources		External pricing sources	$89.3 - $92.4		$	91
					123			Single external source		External pricing source	$89.8 - $89.8		$	89.8
	Total manufactured housing	638			638
	Total available-for-sale mortgage-related securities	106,550			41,895
	Trading, at fair value
	Mortgage-related securities
	Freddie Mac				478			Discounted cash flows		OAS	(219) - 9,748 bps		169 bps
					320			Risk Metrics		Effective duration(1)	1.78 - 2.30 years		2.27 years
					129			Other
	Total Freddie Mac	17,469			927
	Fannie Mae				207			Discounted cash flows		OAS	(173) - 2,027 bps		204 bps
					25			Other
	Total Fannie Mae	6,099			232
	Ginnie Mae	16			1
	Other				3			Median of external sources
					1			Discounted cash flows
	Total other	171			4
	Total trading mortgage-related securities	23,755			1,164
	Total investments in securities	$	130,305		$	43,059
	Other assets:
	Guarantee asset, at fair value				$	1,285		Discounted cash flows		OAS	17 - 202 bps		53 bps
					341			Median of external sources		External pricing sources	$10.0 - $21.2		$	16.6
	Total guarantee asset, at fair value	$	1,626		1,626
	All other, at fair value				5			Other
	Total all other, at fair value	5			5
Total other assets	1,631			1,631
Liabilities
Net derivatives				10			Other
Total net derivatives	1,141			10
	December 31, 2013
	Total			Level  3			Predominant		Unobservable Inputs
	Fair			Fair			Valuation
	Value			Value			Technique(s)		Type	Range		Weighted
												Average
	(dollars in millions)
Recurring fair value measurements
Assets
Investments in securities
Available-for-sale, at fair value
Mortgage-related securities
Freddie Mac				$	1,547		Risk metric		Effective duration(1)	2.25 -5.17 years		2.44 years
				133			Single external source		External pricing source	$99.3 - $99.3		$	99.3
				259			Other
Total Freddie Mac	$	40,659		1,939
Fannie Mae				91			Single external source		External pricing source	$110.5 - $110.5		$	110.5
				26			Median of external sources		External pricing sources	$104.1 - $105.3		$	104.7
				14			Other
Total Fannie Mae	10,797			131
Ginnie Mae				6			Median of external sources
				6			Discounted cash flows
Total Ginnie Mae	167			12
CMBS				2,942			Single external source		External pricing source	$90.9 - $90.9		$	90.9
				167			Other
Total CMBS	30,338			3,109
Subprime, option ARM, and Alt-A:
Subprime				25,367			Median of external sources		External pricing sources	$64.5 - $73.8		$	68.7
				2,132			Other
Total subprime	27,499			27,499
Option ARM				4,995			Median of external sources		External pricing sources	$60.8 - $67.0		$	64.4
				705			Discounted cash flows		OAS	461 - 944 bps		729 bps
				874			Other
Total option ARM	6,574			6,574
Alt-A and other				4,028			Single external source		External pricing source	$83.4 - $83.4		$	83.4
				3,503			Median of external sources		External pricing sources	$72.5 - $79.1		$	75.7
				1,175			Other
Total Alt-A and other	8,706			8,706
Obligations of states and political subdivisions				3,067			Median of external sources		External pricing sources	$98.7 - $99.7		$	99.2
				428			Other
Total obligations of states and political subdivisions	3,495			3,495
Manufactured housing				577			Median of external sources		External pricing sources	$86.7 - $92.8		$	89.7
				107			Other
Total manufactured housing	684			684
Total available-for-sale mortgage-related securities	128,919			52,149
Trading, at fair value
Mortgage-related securities
Freddie Mac				297			Discounted cash flows		OAS	(5) - 9,441 bps		364 bps
				46			Other
Total Freddie Mac	9,349			343
Fannie Mae				191			Discounted cash flows		OAS	(2,257) - 2,295 bps		199 bps
				30			Other
Total Fannie Mae	7,180			221
Ginnie Mae				74			Median of external sources
Total Ginnie Mae	98			74
Other				7			Single external source
				1			Other
Total other	141			8
Total trading mortgage-related securities	16,768			646
Total investments in securities	$	145,687		$	52,795
Other assets:
Guarantee asset, at fair value				$	1,163		Discounted cash flows		OAS	16 - 202 bps		53 bps
				448			Median of external sources		External pricing sources	$11.6 - $25.4		$	19.2
Total guarantee asset, at fair value	$	1,611		1,611
All other, at fair value				9			Other
Total all other, at fair value	9			9
Total other assets	1,620			1,620
Liabilities
Other debt, at fair value				1,000			Single external source		External pricing source	$100.0 - $100.0		$	100
				528			Median of external sources		External pricing sources	$100.0 - $100.1		$	100
Total other debt recorded at fair value	2,683			1,528
Net derivatives				283			Single external source		External pricing source	$0.8 - $0.8		$	0.8
				37			Discounted cash flows
				5			Other
Total net derivatives	(883		)	325
-1	Effective duration is used as a proxy to represent the aggregate impact of key rate durations.
Table - Quantitative Information about Non-Recurring Level 3 Fair Value Measurements	Table 16.5 — Quantitative Information about Non-Recurring Level 3 Fair Value Measurements
		31-Dec-14
		Total			Level 3			Predominant		Unobservable Inputs
		Fair			Fair			Valuation
		Value			Value			Technique(s)		Type	Range		Weighted
													Average
		(dollars in millions)
	Non-recurring fair value measurements
	Mortgage loans	$	8,962		$	8,962
								Internal model		Historical sales	$3,000 - $896,519		$162,556
										proceeds
								Internal model		Housing sales index	38 - 294 bps		82 bps
								Third-party appraisal		Property value	$11 million - $44 million		$31 million
								Income capitalization(1)		Capitalization rates	6%- 9%		7%
	REO, net(2)	$	1,665		$	1,665
								Internal model		Historical sales	$3,008 - $896,519		$154,165
										proceeds
								Internal model		Housing sales index	38 - 294 bps		82 bps
		31-Dec-13
		Total			Level  3			Predominant		Unobservable Inputs
		Fair			Fair			Valuation
		Value			Value			Technique(s)		Type	Range		Weighted
													Average
		(dollars in millions)
	Non-recurring fair value measurements
	Mortgage loans	$	515		$	515
								Income capitalization(1)		Capitalization rates	6% - 9%		7%
								Third-party appraisal		Property value	$4 million - $44 million		$27 million
	REO, net(2)	$	1,837		$	1,837		Internal model		Historical average sales	$17,500- $318,391		$105,508
										proceeds per property
										by state
	-1	The predominant valuation technique used for multifamily mortgage loans. Certain loans in this population are valued using other techniques, and the capitalization rate for those is not represented in the “Range” or “Weighted Average” above.
	-2	The national average REO disposition severity ratio for our REO properties was 34.7% and 36.5% for the years ended December 31, 2014 and 2013, respectively.
Table - Fair Value of Financial Instruments	Table 16.6 — Fair Value of Financial Instruments
		31-Dec-14
					Fair Value
		GAAP Carrying  Amount			Level 1			Level 2			Level 3				Netting Adjustments			Total
		(in millions)
	Financial Assets
	Cash and cash equivalents	$	10,928		$	10,928		$	—		$	—			$	—		$	10,928
	Restricted cash and cash equivalents	8,535			8,535			—			—				—			8,535
	Federal funds sold and securities purchased under agreements to resell	51,903			—			51,903			—				—			51,903
	Investments in securities:
	Available-for-sale, at fair value	106,550			—			64,655			41,895				—			106,550
	Trading, at fair value	30,437			6,682			22,591			1,164				—			30,437
	Total investments in securities	136,987			6,682			87,246			43,059				—			136,987
	Mortgage loans:
	Mortgage loans held by consolidated trusts	1,558,094			—			1,387,412			197,896				—			1,585,308
	Unsecuritized mortgage loans	142,486			—			22,305			119,157				—			141,462
	Total mortgage loans	1,700,580			—			1,409,717			317,053				—			1,726,770
	Derivative assets, net	822			5			9,912			27				(9,122		)	822
	Guarantee asset	1,626			—			—			1,837				—			1,837
	Total financial assets	$	1,911,381		$	26,150		$	1,558,778		$	361,976			$	(9,122	)	$	1,937,782
	Financial Liabilities
	Debt, net:
	Debt securities of consolidated trusts held by third parties	$	1,479,473		$	—		$	1,521,508		$	1,364			$	—		$	1,522,872
	Other debt	450,069			—			444,748			13,371				—			458,119
	Total debt, net	1,929,542			—			1,966,256			14,735				—			1,980,991
	Derivative liabilities, net	1,963			28			13,495			37				(11,597		)	1,963
	Guarantee obligation	1,623			—			—			3,127				—			3,127
	Total financial liabilities	$	1,933,128		$	28		$	1,979,751		$	17,899			$	(11,597	)	$	1,986,081
		December 31, 2013
					Fair Value
		GAAP Carrying Amount			Level 1			Level 2			Level 3				Netting Adjustments			Total
		(in millions)
	Financial Assets
	Cash and cash equivalents(1)	$	11,281		$	11,281		$	—		$	—			$	—		$	11,281
	Restricted cash and cash equivalents	12,265			12,264			1			—				—			12,265
	Federal funds sold and securities purchased under agreements to resell	62,383			—			62,383			—				—			62,383
	Investments in securities:
	Available-for-sale, at fair value	128,919			—			76,770			52,149				—			128,919
	Trading, at fair value	23,404			6,636			16,122			646				—			23,404
	Total investments in securities	152,323			6,636			92,892			52,795				—			152,323
	Mortgage loans:
	Mortgage loans held by consolidated trusts	1,529,905			—			1,258,049			249,693				—			1,507,742
	Unsecuritized mortgage loans	154,885			—			16,145			122,065				—			138,210
	Total mortgage loans	1,684,790			—			1,274,194			371,758				—			1,645,952
	Derivative assets, net	1,063			—			14,220			11				(13,168		)	1,063
	Guarantee asset	1,611			—			—			1,879				—			1,879
	Total financial assets	$	1,925,716		$	30,181		$	1,443,690		$	426,443			$	(13,168	)	$	1,887,146
	Financial Liabilities
	Debt, net:
	Debt securities of consolidated trusts held by third parties(2)	$	1,433,984		$	—		$	1,434,208		$	2,690			$	—		$	1,436,898
	Other debt	506,767			—			499,756			13,089				—			512,845
	Total debt, net	1,940,751			—			1,933,964			15,779				—			1,949,743
	Derivative liabilities, net	180			—			13,291			336				(13,447		)	180
	Guarantee obligation	1,522			—			—			3,067				—			3,067
	Total financial liabilities	$	1,942,453		$	—		$	1,947,255		$	19,182			$	(13,447	)	$	1,952,990
	-1	Includes a reclassification of $3.9 billion to the classification of previously disclosed amounts related to cash and cash equivalents between level 1 and level 2. This reclassification reflects a change in methodology and is not material to the financial statements.
	-2	Includes a reclassification of $1.7 billion to the classification of previously disclosed amounts related to debt securities of consolidated trusts held by third parties between level 2 and level 3. This reclassification reflects a correction of an error and is not material to the financial statements.
Table - Difference between Fair Value and Unpaid Principal Balance for Certain Financial Instruments with Fair Value Option Elected	Table 16.7 — Difference between Fair Value and Unpaid Principal Balance for Certain Financial Instruments with Fair Value Option Elected
		December 31,
		2014						2013
		Multifamily			Other Debt -			Multifamily			Other Debt -
		Held-For-Sale			Long Term			Held-For-Sale			Long Term
		Mortgage Loans						Mortgage Loans
		(in millions)
	Fair value	$	12,130		$	5,820		$	8,727		$	2,683
	Unpaid principal balance	11,872			5,896			8,721			2,635
	Difference	$	258		$	(76	)	$	6		$	48

Regulatory_Capital_Tables

Regulatory Capital (Tables)	12 Months Ended
	Dec. 31, 2014
Mortgage Banking [Abstract]
Table - Net Worth and Minimum Capital	Table 18.1 — Net Worth and Minimum Capital
		31-Dec-14			31-Dec-13
		(in millions)
	GAAP net worth	$	2,651		$	12,835
	Core capital (deficit)(1)(2)	$	(71,415	)	$	(59,495	)
	Less: Minimum capital requirement(1)	20,090			21,404
	Minimum capital surplus (deficit)(1)	$	(91,505	)	$	(80,899	)
	-1	Core capital and minimum capital figures for December 31, 2014 are estimates. FHFA is the authoritative source for our regulatory capital.
	-2	Core capital excludes certain components of GAAP total equity (i.e., AOCI and the liquidation preference of the senior preferred stock) as these items do not meet the statutory definition of core capital.

Selected_Financial_Statement_L1

Selected Financial Statement Line Items (Tables)	12 Months Ended
	Dec. 31, 2014
Selected Financial Statement Data [Abstract]
Table - Significant Components of Other Income (Loss) on Our Consolidated Statements of Comprehensive Income	Table 19.1 — Significant Components of Other Income (Loss) on Our Consolidated Statements of Comprehensive Income
		Year Ended December 31,
		2014		2013			2012
		(in millions)
	Other income (loss):
	Non-agency mortgage-related securities settlements(1)	$	6,084	$	5,501		$	—
	Gains (losses) on mortgage loans	731		(336		)	1,010
	Other	1,229		1,485			1,180
	Total other income (loss)	$	8,044	$	6,650		$	2,190
	-1	Settlement agreements primarily related to lawsuits regarding our investments in certain non-agency mortgage-related securities is a significant component of other income in 2014 and 2013. For more information, see “NOTE 15: CONCENTRATION OF CREDIT AND OTHER RISKS — Non-Agency Mortgage-Related Security Issuers.”
Table - Significant Components of Other Assets and Other Liabilities on Our Consolidated Balance Sheets	Table 19.2 — Significant Components of Other Assets and Other Liabilities on Our Consolidated Balance Sheets
		31-Dec-14		31-Dec-13
		(in millions)
	Other assets:
	Accounts and other receivables(1)	$	3,899	$	4,367
	Current income tax receivable	1,048		1,316
	Guarantee asset	1,626		1,611
	All other	1,121		1,245
	Total other assets	$	7,694	$	8,539
	Other liabilities:
	Servicer liabilities	$	1,847	$	2,277
	Guarantee obligation	1,623		1,522
	Accounts payable and accrued expenses	803		886
	All other	785		807
	Total other liabilities	$	5,058	$	5,492
	-1	Primarily consists of servicer receivables and other non-interest receivables.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	numberofreportablesegments
Change in Accounting Estimate [Line Items]
Net cash provided by operating activities	$8,885,000,000	$16,552,000,000	$5,244,000,000
Net cash used in financing activities	-214,506,000,000	-405,043,000,000	-519,575,000,000
Number of reportable segments	3
Held-to-maturity Securities	0	0
Derivatives in Hedge Accounting Relationships	0	0
Reclassification adjustment
Change in Accounting Estimate [Line Items]
Net cash provided by operating activities		-2,000,000,000	-3,200,000,000
Net cash used in financing activities		$2,000,000,000	$3,200,000,000

Conservatorship_and_Related_Ma1

Conservatorship and Related Matters (Details) (USD $)	3 Months Ended	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 08, 2008	Dec. 31, 2009	Sep. 30, 2008
	numberofstrategicgoals	numberofstrategicgoals
Conservatorship and related matters line items
Number of strategic goals	3	3
Funding available under purchase agreement	$140,500,000,000	$140,500,000,000
Initial liquidation preference of senior preferred stock							1,000,000,000
Common stock warrant, percentage of common stock shares that can be purchased	79.90%	79.90%
Applicable capital reserve amount	2,400,000,000	2,400,000,000	3,000,000,000
Applicable capital reserve amount for 2018	0	0
Annual reduction of capital reserve amount	600,000,000	600,000,000
Allowance of non-ordinary course asset sales	250,000,000	250,000,000
Maximum limit of the UPB of mortgage-related investments portfolio	470,000,000,000	470,000,000,000		650,000,000,000
Annual maximum percentage of mortgage-related investments portfolio Limit	90.00%	90.00%	85.00%
Minimum limit of the UPB of mortgage-related investments portfolio	250,000,000,000	250,000,000,000
Debt limit as percentage of mortgage assets	120.00%	120.00%
UPB of mortgage-related investments portfolio	408,000,000,000	408,000,000,000
Annual percentage reduction of the mortgage-related investments portfolio		15.00%
Draw received	0	0	0	165,000,000
Aggregate dividend payments since conservatorship began	91,000,000,000	91,000,000,000
TCFLP - credit and liquidity support for HFA						8,200,000,000
NIBP - financing support for HFA						15,300,000,000
TCLFP and NIBP - % of initial losses of total principal born by Treasury						35.00%
U.S. Government
Conservatorship and related matters line items
Amount of related party transaction		0	0	0
CSS
Conservatorship and related matters line items
Amount of related party transaction		43,000,000
Senior Preferred Stock
Conservatorship and related matters line items
Senior preferred stock, shares issued					1,000,000
Senior Preferred Stock, Dividend Rate				10.00%
Year 2015
Conservatorship and related matters line items
Applicable capital reserve amount	$1,800,000,000	$1,800,000,000

Variable_Interest_Entities_Det

Variable Interest Entities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	numberofloans	numberofloans
Variable Interest Entity [Line Items]
Purchased Percentage Of Value Of Underlying Property For Unsecuritized Multifamily Loans	80.00%
Remaining Percentage Of Value Not Funded Through Unsecuritized Multifamily Loans Freddie Mac Acquired	20.00%
Volume Of Unsecuritized Multifamily Loans Held	4,400	5,000
UPB of Mortgage Loans	$1,699,352,000,000	$1,690,474,000,000
Decrease in investment securities and debt securities of consolidated trusts held by third parties from the consolidation of VIEs	400,000,000	2,200,000,000	4,600,000,000
Multifamily
Variable Interest Entity [Line Items]
UPB of Mortgage Loans	53,480,000,000	59,615,000,000
Single-family PC Trusts
Variable Interest Entity [Line Items]
Consolidated UPB of VIE	1,500,000,000,000	1,500,000,000,000
REMIC Trust
Variable Interest Entity [Line Items]
Consolidated UPB of VIE	1,400,000,000	3,500,000,000
Other Guarantee Transactions
Variable Interest Entity [Line Items]
Consolidated UPB of VIE	7,400,000,000	8,900,000,000
Credit enhanced multifamily housing revenue bonds
Variable Interest Entity [Line Items]
Number Of credit-enhanced multifamily housing revenue bonds that Freddie Mac was the primary beneficiary	0	1
Freddie Mac parent | Multifamily
Variable Interest Entity [Line Items]
UPB of Mortgage Loans	$53,000,000,000	$59,200,000,000

Variable_Interest_Entities_Var

Variable Interest Entities - Variable Interests in VIEs for which We are not the Primary Beneficiary (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets [Abstract]
Restricted Cash and Cash Equivalents	$8,535	$12,265
Investments in Securities [Abstract]
Available-for-sale, at fair value	106,550	128,919
Trading Securities, Debt	30,437	23,404
Mortgage Loans [Abstract]
Mortgage loans held-for-investment	1,688,212	1,676,063
Mortgage loans held-for-sale	12,368	8,727
Accrued interest receivable	6,034	6,150
Other Assets	7,694	8,539
Liabilities [Abstract]
Derivative liabilities, net	-1,963	-180
Other Liabilities	-5,058	-5,492
Freddie Mac Securities
Assets [Abstract]
Restricted Cash and Cash Equivalents	0	6
Investments in Securities [Abstract]
Available-for-sale, at fair value	39,099	40,659
Trading Securities, Debt	17,469	9,349
Mortgage Loans [Abstract]
Mortgage loans held-for-investment	0	0
Mortgage loans held-for-sale	0	0
Accrued interest receivable	236	232
Other Assets	914	833
Liabilities [Abstract]
Derivative liabilities, net	0	-3
Other Liabilities	-1,005	-875
Maximum Exposure to Loss	87,529	72,072
Total Assets of Non-Consolidated VIEs	103,253	84,731
Non Freddie Mac Securities
Assets [Abstract]
Restricted Cash and Cash Equivalents	0	0
Investments in Securities [Abstract]
Available-for-sale, at fair value	65,253	84,765
Trading Securities, Debt	6,282	7,414
Mortgage Loans [Abstract]
Mortgage loans held-for-investment	0	0
Mortgage loans held-for-sale	0	0
Accrued interest receivable	165	226
Other Assets	2	14
Liabilities [Abstract]
Derivative liabilities, net	0	0
Other Liabilities	0	-2
Maximum Exposure to Loss	69,206	92,559
Total Assets of Non-Consolidated VIEs	390,515	506,699
Unsecuritized Multifamily Loans
Assets [Abstract]
Restricted Cash and Cash Equivalents	0	8
Investments in Securities [Abstract]
Available-for-sale, at fair value	0	0
Trading Securities, Debt	0	0
Mortgage Loans [Abstract]
Mortgage loans held-for-investment	40,753	50,306
Mortgage loans held-for-sale	12,368	8,727
Accrued interest receivable	221	261
Other Assets	369	407
Liabilities [Abstract]
Derivative liabilities, net	0	0
Other Liabilities	-10	-12
Maximum Exposure to Loss	53,711	59,710
Total Assets of Non-Consolidated VIEs	95,874	105,120
Other
Assets [Abstract]
Restricted Cash and Cash Equivalents	3	58
Investments in Securities [Abstract]
Available-for-sale, at fair value	0	0
Trading Securities, Debt	0	0
Mortgage Loans [Abstract]
Mortgage loans held-for-investment	0	0
Mortgage loans held-for-sale	0	0
Accrued interest receivable	7	7
Other Assets	495	477
Liabilities [Abstract]
Derivative liabilities, net	-30	-35
Other Liabilities	-560	-558
Maximum Exposure to Loss	10,419	10,415
Total Assets of Non-Consolidated VIEs	$22,855	$23,707

Mortgage_Loans_and_Loan_Loss_R2

Mortgage Loans and Loan Loss Reserves (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Mar. 31, 2015
	transaction	transaction
Accounts, Notes, Loans and Financing Receivables [Line Items]
Pool insurance purchased since March 2008 single-family loans	$0
Percent of Single-Family Credit Guarantee portfolio with second lien financing by third parties at origination	14.00%	14.00%
Mortgage loan UPB covered by federal agency issued insurance or partial guarantee	3,600,000,000	3,900,000,000
Number of STACR transactions	7	2
Number of ACIS transactions	3	1
Noncash acquisition, mortgage loans held-for-investment acquired	187,100,000,000	340,900,000,000	358,100,000,000
Unsecuritized
Accounts, Notes, Loans and Financing Receivables [Line Items]
Allowance for loan losses as a percentage of recorded investment of mortgage loans, held for investment	12.70%	12.90%
Held by consolidated trusts
Accounts, Notes, Loans and Financing Receivables [Line Items]
Allowance for loan losses as a percentage of recorded investment of mortgage loans, held for investment	0.20%	0.20%
Single-family
Accounts, Notes, Loans and Financing Receivables [Line Items]
Financing Receivable, Significant Purchases	252,700,000,000	412,900,000,000
Recorded investment of mortgage loans reclassified to held-for-sale				900,000,000
Single-family | Subsequent event
Accounts, Notes, Loans and Financing Receivables [Line Items]
Recorded investment of mortgage loans reclassified to held-for-sale					1,400,000,000
Multifamily
Accounts, Notes, Loans and Financing Receivables [Line Items]
Financing Receivable, Significant Purchases	2,400,000,000	1,300,000,000
Financing Receivable, Significant Sales	$21,300,000,000	$28,300,000,000

Mortgage_Loans_and_Loan_Loss_R3

Mortgage Loans and Loan Loss Reserves - Mortgage Loans (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	$1,699,352	$1,690,474
Deferred fees, unamortized premiums, discounts and other cost basis adjustments	22,732	18,928
Fair value adjustments on loans held-for-sale	257	6
Allowance for loan losses on mortgage loans held-for-investment	-21,761	-24,618
Total mortgage loans, net	1,700,580	1,684,790
Mortgage loans held-for-investment	1,688,212	1,676,063
Mortgage loans held-for-sale	12,368	8,727
Total mortgage loans, net	1,700,580	1,684,790
Single-family
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	1,645,872	1,630,859
Allowance for loan losses on mortgage loans held-for-investment	-21,684	-24,493
Mortgage loans held-for-investment	1,646,936	1,625,314
Single-family | Fixed-rate
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	1,541,669	1,522,740
Single-family | Fixed-rate amortizing
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	1,537,432	1,516,438
Single-family | Fixed-rate interest-only
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	4,237	6,302
Single-family | Adjustable-rate
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	93,549	95,781
Single-family | Adjustable-rate amortizing
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	69,985	67,364
Single-family | Adjustable-rate interest-only
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	23,564	28,417
Single-family | Other Guarantee Transactions
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	7,042	8,431
Single-family | FHA/VA and other governmental
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	3,612	3,907
Multifamily
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	53,480	59,615
Allowance for loan losses on mortgage loans held-for-investment	-77	-125
Mortgage loans held-for-investment	41,276	50,749
Multifamily | Fixed-rate
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	44,156	51,145
Multifamily | Adjustable-rate
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	9,321	8,467
Multifamily | FHA/VA and other governmental
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	3	3
Unsecuritized
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	164,472	181,308
Deferred fees, unamortized premiums, discounts and other cost basis adjustments	-3,366	-4,817
Fair value adjustments on loans held-for-sale	257	6
Allowance for loan losses on mortgage loans held-for-investment	-18,877	-21,612	-25,788
Total mortgage loans, net	142,486	154,885
Mortgage loans held-for-investment	130,118	146,158
Mortgage loans held-for-sale	12,368	8,727
Total mortgage loans, net	142,486	154,885
Unsecuritized | Single-family
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	111,516	122,137
Allowance for loan losses on mortgage loans held-for-investment	-18,800	-21,487	-25,449
Unsecuritized | Single-family | Fixed-rate
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	106,499	115,073
Unsecuritized | Single-family | Fixed-rate amortizing
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	105,560	113,597
Unsecuritized | Single-family | Fixed-rate interest-only
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	939	1,476
Unsecuritized | Single-family | Adjustable-rate
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	4,544	6,511
Unsecuritized | Single-family | Adjustable-rate amortizing
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	1,353	1,935
Unsecuritized | Single-family | Adjustable-rate interest-only
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	3,191	4,576
Unsecuritized | Single-family | Other Guarantee Transactions
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	0	0
Unsecuritized | Single-family | FHA/VA and other governmental
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	473	553
Unsecuritized | Multifamily
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	52,956	59,171
Allowance for loan losses on mortgage loans held-for-investment	-77	-125	-339
Unsecuritized | Multifamily | Fixed-rate
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	43,632	50,701
Unsecuritized | Multifamily | Adjustable-rate
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	9,321	8,467
Unsecuritized | Multifamily | FHA/VA and other governmental
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	3	3
Held by consolidated trusts
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	1,534,880	1,509,166
Deferred fees, unamortized premiums, discounts and other cost basis adjustments	26,098	23,745
Fair value adjustments on loans held-for-sale	0	0
Allowance for loan losses on mortgage loans held-for-investment	-2,884	-3,006	-4,919
Total mortgage loans, net	1,558,094	1,529,905
Mortgage loans held-for-investment	1,558,094	1,529,905
Mortgage loans held-for-sale	0	0
Total mortgage loans, net	1,558,094	1,529,905
Held by consolidated trusts | Single-family
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	1,534,356	1,508,722
Allowance for loan losses on mortgage loans held-for-investment	-2,884	-3,006	-4,918
Held by consolidated trusts | Single-family | Fixed-rate
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	1,435,170	1,407,667
Held by consolidated trusts | Single-family | Fixed-rate amortizing
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	1,431,872	1,402,841
Held by consolidated trusts | Single-family | Fixed-rate interest-only
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	3,298	4,826
Held by consolidated trusts | Single-family | Adjustable-rate
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	89,005	89,270
Held by consolidated trusts | Single-family | Adjustable-rate amortizing
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	68,632	65,429
Held by consolidated trusts | Single-family | Adjustable-rate interest-only
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	20,373	23,841
Held by consolidated trusts | Single-family | Other Guarantee Transactions
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	7,042	8,431
Held by consolidated trusts | Single-family | FHA/VA and other governmental
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	3,139	3,354
Held by consolidated trusts | Multifamily
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	524	444
Allowance for loan losses on mortgage loans held-for-investment	0	0	-1
Held by consolidated trusts | Multifamily | Fixed-rate
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	524	444
Held by consolidated trusts | Multifamily | Adjustable-rate
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	0	0
Held by consolidated trusts | Multifamily | FHA/VA and other governmental
Accounts, Notes, Loans and Financing Receivables [Line Items]
UPB of Mortgage Loans	$0	$0

Mortgage_Loans_and_Loan_Loss_R4

Mortgage Loans and Loan Loss Reserves - Recorded Investment of Held-For-Investment Mortgage Loans, by LTV Ratio (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	$1,709,973,000,000	$1,700,681,000,000
UPB for Single-family reduced interest rate provision	42,300,000,000	43,800,000,000
Single-family 20 and 30-year or more, amortizing fixed-rate
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	1,254,595,000,000	1,213,110,000,000
Single-family 15-year amortizing fixed-rate
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	282,537,000,000	295,617,000,000
Single-family Adjustable-rate
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	67,873,000,000	64,500,000,000
Single-family Alt-A, interest-only, and option ARM
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	63,615,000,000	76,580,000,000
Single Family Loans
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	1,668,620,000,000	1,649,807,000,000
Single-Family serious delinquency rate	1.88%	2.39%
Multifamily Loans
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	41,353,000,000	50,874,000,000
Less Than Or Equal To 80 Estimated Current LTV Ratio | Single-family 20 and 30-year or more, amortizing fixed-rate
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	911,071,000,000	819,509,000,000
Less Than Or Equal To 80 Estimated Current LTV Ratio | Single-family 15-year amortizing fixed-rate
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	265,098,000,000	270,211,000,000
Less Than Or Equal To 80 Estimated Current LTV Ratio | Single-family Adjustable-rate
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	60,463,000,000	56,208,000,000
Less Than Or Equal To 80 Estimated Current LTV Ratio | Single-family Alt-A, interest-only, and option ARM
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	28,935,000,000	29,927,000,000
Less Than Or Equal To 80 Estimated Current LTV Ratio | Single Family Loans
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	1,265,567,000,000	1,175,855,000,000
Greater Than 80 Through 100 Estimated Current LTV Ratio | Single-family 20 and 30-year or more, amortizing fixed-rate
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	258,126,000,000	269,110,000,000
Greater Than 80 Through 100 Estimated Current LTV Ratio | Single-family 15-year amortizing fixed-rate
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	14,101,000,000	19,658,000,000
Greater Than 80 Through 100 Estimated Current LTV Ratio | Single-family Adjustable-rate
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	6,701,000,000	6,714,000,000
Greater Than 80 Through 100 Estimated Current LTV Ratio | Single-family Alt-A, interest-only, and option ARM
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	18,232,000,000	21,564,000,000
Greater Than 80 Through 100 Estimated Current LTV Ratio | Single Family Loans
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	297,160,000,000	317,046,000,000
Greater Than 100 Estimated Current LTV Ratio | Single-family 20 and 30-year or more, amortizing fixed-rate
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	85,398,000,000	124,491,000,000
Greater Than 100 Estimated Current LTV Ratio | Single-family 15-year amortizing fixed-rate
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	3,338,000,000	5,748,000,000
Greater Than 100 Estimated Current LTV Ratio | Single-family Adjustable-rate
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	709,000,000	1,578,000,000
Greater Than 100 Estimated Current LTV Ratio | Single-family Alt-A, interest-only, and option ARM
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	16,448,000,000	25,089,000,000
Greater Than 100 Estimated Current LTV Ratio | Single Family Loans
Financing Receivable, Recorded Investment [Line Items]
Recorded investment of held-for-investment mortgage loans	$105,893,000,000	$156,906,000,000
Single-Family serious delinquency rate	9.01%	9.89%

Mortgage_Loans_and_Loan_Loss_R5

Mortgage Loans and Loan Loss Reserves - Detail of Loan Loss Reserves (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Rollforward of Allowance for Loan Losses
Beginning balance	$24,618
Ending balance	21,761	24,618
Reserve For Guarantee Losses Rollforward
Beginning balance	111	183
Provision (benefit) for credit losses	21	-51
Charge-offs	-6	-10
Recoveries	0	0
Transfers, net	0	-11
Ending balance	126	111	183
Rollforward of Total loan loss reserves
Beginning balance	24,729	30,890
Provision (benefit) for credit losses	58	-2,465	1,890
Charge-offs	-4,895	-9,002
Recoveries	1,259	4,314
Transfers, net	736	992
Ending balance	21,887	24,729	30,890
Reclassified reserves
Rollforward of Total loan loss reserves
Transfers, net	1,000	3,400
Capitalization of past due interest on modified loans
Rollforward of Total loan loss reserves
Transfers, net	700	1,000
Single-family
Rollforward of Allowance for Loan Losses
Beginning balance	24,493
Ending balance	21,684	24,493
Reserve For Guarantee Losses Rollforward
Beginning balance	85	141
Provision (benefit) for credit losses	30	-42
Charge-offs	-6	-10
Recoveries	0	0
Transfers, net	0	-4
Ending balance	109	85
Rollforward of Total loan loss reserves
Beginning balance	24,578	30,508
Provision (benefit) for credit losses	113	-2,247
Charge-offs	-4,892	-8,995
Recoveries	1,258	4,313
Transfers, net	736	999
Ending balance	21,793	24,578
Ratio of total loan loss reserves (excluding TDR concessions) to net charge-offs for single-family loans	2.5	1.9
Ratio of total loan loss reserves to net charge-offs for single-family loans	5.2	3.5
Multifamily
Rollforward of Allowance for Loan Losses
Beginning balance	125
Ending balance	77	125
Reserve For Guarantee Losses Rollforward
Beginning balance	26	42
Provision (benefit) for credit losses	-9	-9
Charge-offs	0	0
Recoveries	0	0
Transfers, net	0	-7
Ending balance	17	26
Rollforward of Total loan loss reserves
Beginning balance	151	382
Provision (benefit) for credit losses	-55	-218
Charge-offs	-3	-7
Recoveries	1	1
Transfers, net	0	-7
Ending balance	94	151
Unsecuritized
Rollforward of Allowance for Loan Losses
Beginning balance	21,612	25,788
Provision (benefit) for credit losses	-910	-4,203
Charge-offs	-4,513	-8,188
Recoveries	999	3,811
Transfers, net	1,689	4,404
Ending balance	18,877	21,612
Unsecuritized | Single-family
Rollforward of Allowance for Loan Losses
Beginning balance	21,487	25,449
Provision (benefit) for credit losses	-864	-3,995
Charge-offs	-4,510	-8,181
Recoveries	998	3,810
Transfers, net	1,689	4,404
Ending balance	18,800	21,487
Unsecuritized | Multifamily
Rollforward of Allowance for Loan Losses
Beginning balance	125	339
Provision (benefit) for credit losses	-46	-208
Charge-offs	-3	-7
Recoveries	1	1
Transfers, net	0	0
Ending balance	77	125
Held by consolidated trusts
Rollforward of Allowance for Loan Losses
Beginning balance	3,006	4,919
Provision (benefit) for credit losses	947	1,789
Charge-offs	-376	-804
Recoveries	260	503
Transfers, net	-953	-3,401
Ending balance	2,884	3,006
Held by consolidated trusts | Single-family
Rollforward of Allowance for Loan Losses
Beginning balance	3,006	4,918
Provision (benefit) for credit losses	947	1,790
Charge-offs	-376	-804
Recoveries	260	503
Transfers, net	-953	-3,401
Ending balance	2,884	3,006
Held by consolidated trusts | Multifamily
Rollforward of Allowance for Loan Losses
Beginning balance	0	1
Provision (benefit) for credit losses	0	-1
Charge-offs	0	0
Recoveries	0	0
Transfers, net	0	0
Ending balance	$0	$0

Mortgage_Loans_and_Loan_Loss_R6

Mortgage Loans and Loan Loss Reserves - Net Investment in Mortgage Loans (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment, collectively evaluated	$1,608,688	$1,601,265
Recorded investment, individually evaluated	101,285	99,416
Total recorded investment	1,709,973	1,700,681
Allowance for loan losses, collectively evaluated	-3,872	-5,984
Allowance for loan losses, individually evaluated	-17,889	-18,634
Total ending balance of the allowance	-21,761	-24,618
Net investment in mortgage loans	1,688,212	1,676,063
Single-family
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment, collectively evaluated	1,568,237	1,551,667
Recorded investment, individually evaluated	100,383	98,140
Total recorded investment	1,668,620	1,649,807
Allowance for loan losses, collectively evaluated	-3,847	-5,939
Allowance for loan losses, individually evaluated	-17,837	-18,554
Total ending balance of the allowance	-21,684	-24,493
Net investment in mortgage loans	1,646,936	1,625,314
Multifamily
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded investment, collectively evaluated	40,451	49,598
Recorded investment, individually evaluated	902	1,276
Total recorded investment	41,353	50,874
Allowance for loan losses, collectively evaluated	-25	-45
Allowance for loan losses, individually evaluated	-52	-80
Total ending balance of the allowance	-77	-125
Net investment in mortgage loans	$41,276	$50,749

Mortgage_Loans_and_Loan_Loss_R7

Mortgage Loans and Loan Loss Reserves - Recourse and Other Forms of Credit Protection (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Recourse And Other Forms Of Credit Protection [Line Items]
Excluded credit protected mortgage loans UPB underlying Other Guarantee Transactions	$9,800,000,000	$11,500,000,000
Credit risk transfer transactions
Recourse And Other Forms Of Credit Protection [Line Items]
Excluded credit protected mortgage loans UPB also covered by primary mortgage insurance	48,300,000,000
Pool insurance
Recourse And Other Forms Of Credit Protection [Line Items]
Excluded credit protected mortgage loans UPB also covered by primary mortgage insurance	900,000,000	1,800,000,000
Single-family
Recourse And Other Forms Of Credit Protection [Line Items]
Credit protected mortgage loans UPB	386,332,000,000	278,908,000,000
Credit protected mortgage loans Maximum Coverage	75,315,000,000	63,678,000,000
Single-family | Primary mortgage insurance
Recourse And Other Forms Of Credit Protection [Line Items]
Credit protected mortgage loans UPB	227,495,000,000	203,470,000,000
Credit protected mortgage loans Maximum Coverage	57,938,000,000	50,823,000,000
Single-family | Credit risk transfer transactions
Recourse And Other Forms Of Credit Protection [Line Items]
Credit protected mortgage loans UPB	144,272,000,000	56,903,000,000
Credit protected mortgage loans Maximum Coverage	6,657,000,000	1,183,000,000
Single-family | Lender recourse and indemnification
Recourse And Other Forms Of Credit Protection [Line Items]
Credit protected mortgage loans UPB	6,527,000,000	7,119,000,000
Credit protected mortgage loans Maximum Coverage	6,092,000,000	6,726,000,000
Single-family | Pool insurance
Recourse And Other Forms Of Credit Protection [Line Items]
Credit protected mortgage loans UPB	2,284,000,000	4,683,000,000
Credit protected mortgage loans Maximum Coverage	947,000,000	1,186,000,000
Single-family | HFA indemnification
Recourse And Other Forms Of Credit Protection [Line Items]
Credit protected mortgage loans UPB	3,357,000,000	4,051,000,000
Credit protected mortgage loans Maximum Coverage	3,324,000,000	3,323,000,000
Single-family | Subordination
Recourse And Other Forms Of Credit Protection [Line Items]
Credit protected mortgage loans UPB	2,377,000,000	2,644,000,000
Credit protected mortgage loans Maximum Coverage	339,000,000	399,000,000
Single-family | Other credit enhancements
Recourse And Other Forms Of Credit Protection [Line Items]
Credit protected mortgage loans UPB	20,000,000	38,000,000
Credit protected mortgage loans Maximum Coverage	18,000,000	38,000,000
Multifamily
Recourse And Other Forms Of Credit Protection [Line Items]
Credit protected mortgage loans UPB	86,743,000,000	71,332,000,000
Credit protected mortgage loans Maximum Coverage	16,756,000,000	13,890,000,000
Multifamily | K Certificates
Recourse And Other Forms Of Credit Protection [Line Items]
Credit protected mortgage loans UPB	75,541,000,000	59,326,000,000
Credit protected mortgage loans Maximum Coverage	13,576,000,000	10,601,000,000
Multifamily | HFA indemnification
Recourse And Other Forms Of Credit Protection [Line Items]
Credit protected mortgage loans UPB	772,000,000	905,000,000
Credit protected mortgage loans Maximum Coverage	699,000,000	699,000,000
Multifamily | Subordination
Recourse And Other Forms Of Credit Protection [Line Items]
Credit protected mortgage loans UPB	4,724,000,000	4,435,000,000
Credit protected mortgage loans Maximum Coverage	796,000,000	756,000,000
Multifamily | Other credit enhancements
Recourse And Other Forms Of Credit Protection [Line Items]
Credit protected mortgage loans UPB	5,706,000,000	6,666,000,000
Credit protected mortgage loans Maximum Coverage	$1,685,000,000	$1,834,000,000

Impaired_Loans_Details

Impaired Loans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jan. 31, 2015
Subsequent event
Impaired Loans [Line Items]
Amount of principal reduction incentive			$5,000
Single-family
Impaired Loans [Line Items]
SF UPB not removed from Consolidated Trust for loans 120 days or more delinquent	800,000,000
SF UPB removed from Consolidated Trust	11,200,000,000	18,200,000,000
Interest rate reduction and term extension types, percentage of completed modifications	51.00%
Principal forebearance and interest rate reductions and term extension types, percentage of completed modifications	25.00%
Average term extension, number of months of completed modifications	184 months
Average interest rate reduction, percentage of completed modifications	1.30%
Other loss mitigation activities
Impaired Loans [Line Items]
Number of Loans, Modifications, Subsequent Default	9,538	8,473
Post-TDR Recorded Investment, Modifications, Subsequent Default	1,400,000,000	1,400,000,000
Loans discharged from Chapter 7 bankruptcy
Impaired Loans [Line Items]
Number of Loans, Modifications, Subsequent Default	4,206	17,225
Post-TDR Recorded Investment, Modifications, Subsequent Default	$600,000,000	$2,800,000,000

Impaired_Loans_Individially_Im

Impaired Loans - Individially Impaired Loans (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Individually Impaired Mortgage Loans [Abstract]
UPB	$105,394	$104,202
Recorded Investment	101,285	99,416
Associated Allowance	-17,889	-18,634
Net Investment	83,396	80,782
Average Recorded Investment	100,482	94,803
Interest Income Recognized	3,337	3,130
Interest Income Recognized On Cash Basis	418	460
Single-family 20 and 30-year or more, amortizing fixed-rate
With no specific allowance recorded [Abstract]
UPB	6,041	5,927
Recorded Investment	4,007	3,355
Net Investment	4,007	3,355
Average Recorded Investment	3,727	3,370
Interest Income Recognized	376	394
Interest Income Recognized On Cash Basis	33	34
With specific allowance recorded [Abstract]
UPB	77,798	75,633
Recorded Investment	76,708	74,554
Net Investment	62,657	60,123
Average Recorded Investment	75,773	69,922
Interest Income Recognized	2,357	2,127
Interest Income Recognized On Cash Basis	279	282
Individually Impaired Mortgage Loans [Abstract]
UPB	83,839	81,560
Recorded Investment	80,715	77,909
Associated Allowance	-14,051	-14,431
Net Investment	66,664	63,478
Average Recorded Investment	79,500	73,292
Interest Income Recognized	2,733	2,521
Interest Income Recognized On Cash Basis	312	316
Single-family 15-year amortizing fixed-rate
With no specific allowance recorded [Abstract]
UPB	63	62
Recorded Investment	44	34
Net Investment	44	34
Average Recorded Investment	39	31
Interest Income Recognized	10	6
Interest Income Recognized On Cash Basis	1	1
With specific allowance recorded [Abstract]
UPB	1,226	1,324
Recorded Investment	1,233	1,324
Net Investment	1,193	1,281
Average Recorded Investment	1,242	1,109
Interest Income Recognized	54	50
Interest Income Recognized On Cash Basis	10	11
Individually Impaired Mortgage Loans [Abstract]
UPB	1,289	1,386
Recorded Investment	1,277	1,358
Associated Allowance	-40	-43
Net Investment	1,237	1,315
Average Recorded Investment	1,281	1,140
Interest Income Recognized	64	56
Interest Income Recognized On Cash Basis	11	12
Single-family Adjustable-rate
With no specific allowance recorded [Abstract]
UPB	27	19
Recorded Investment	22	13
Net Investment	22	13
Average Recorded Investment	17	13
Interest Income Recognized	1	1
Interest Income Recognized On Cash Basis	0	0
With specific allowance recorded [Abstract]
UPB	868	967
Recorded Investment	866	962
Net Investment	801	878
Average Recorded Investment	881	855
Interest Income Recognized	23	22
Interest Income Recognized On Cash Basis	6	6
Individually Impaired Mortgage Loans [Abstract]
UPB	895	986
Recorded Investment	888	975
Associated Allowance	-65	-84
Net Investment	823	891
Average Recorded Investment	898	868
Interest Income Recognized	24	23
Interest Income Recognized On Cash Basis	6	6
Single-family Alt-A, interest-only, and option ARM
With no specific allowance recorded [Abstract]
UPB	1,717	1,758
Recorded Investment	1,168	1,038
Net Investment	1,168	1,038
Average Recorded Investment	1,133	978
Interest Income Recognized	81	72
Interest Income Recognized On Cash Basis	6	6
With specific allowance recorded [Abstract]
UPB	16,734	17,210
Recorded Investment	16,335	16,860
Net Investment	12,654	12,864
Average Recorded Investment	16,476	16,526
Interest Income Recognized	380	369
Interest Income Recognized On Cash Basis	58	69
Individually Impaired Mortgage Loans [Abstract]
UPB	18,451	18,968
Recorded Investment	17,503	17,898
Associated Allowance	-3,681	-3,996
Net Investment	13,822	13,902
Average Recorded Investment	17,609	17,504
Interest Income Recognized	461	441
Interest Income Recognized On Cash Basis	64	75
Single-family
With no specific allowance recorded [Abstract]
UPB	7,848	7,766
Recorded Investment	5,241	4,440
Net Investment	5,241	4,440
Average Recorded Investment	4,916	4,392
Interest Income Recognized	468	473
Interest Income Recognized On Cash Basis	40	41
With specific allowance recorded [Abstract]
UPB	96,626	95,134
Recorded Investment	95,142	93,700
Net Investment	77,305	75,146
Average Recorded Investment	94,372	88,412
Interest Income Recognized	2,814	2,568
Interest Income Recognized On Cash Basis	353	368
Individually Impaired Mortgage Loans [Abstract]
UPB	104,474	102,900
Recorded Investment	100,383	98,140
Associated Allowance	-17,837	-18,554
Net Investment	82,546	79,586
Average Recorded Investment	99,288	92,804
Interest Income Recognized	3,282	3,041
Interest Income Recognized On Cash Basis	393	409
Multifamily
With no specific allowance recorded [Abstract]
UPB	440	694
Recorded Investment	431	681
Net Investment	431	681
Average Recorded Investment	659	1,108
Interest Income Recognized	29	48
Interest Income Recognized On Cash Basis	9	20
With specific allowance recorded [Abstract]
UPB	480	608
Recorded Investment	471	595
Net Investment	419	515
Average Recorded Investment	535	891
Interest Income Recognized	26	41
Interest Income Recognized On Cash Basis	16	31
Individually Impaired Mortgage Loans [Abstract]
UPB	920	1,302
Recorded Investment	902	1,276
Associated Allowance	-52	-80
Net Investment	850	1,196
Average Recorded Investment	1,194	1,999
Interest Income Recognized	55	89
Interest Income Recognized On Cash Basis	$25	$51

Impaired_Loans_Payment_Status_

Impaired Loans - Payment Status of Mortgage Loans (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$1,649,778	$1,626,513
One Month Past Due	21,307	24,332
Two Months Past Due	7,110	8,271
Three Months or More Past Due, or in Foreclosure	31,778	41,565
Total recorded investment	1,709,973	1,700,681
Non-Accrual	32,157	42,143
Single-family 20 and 30-year or more, amortizing fixed-rate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,207,826	1,157,057
One Month Past Due	17,516	19,743
Two Months Past Due	5,817	6,675
Three Months or More Past Due, or in Foreclosure	23,436	29,635
Total recorded investment	1,254,595	1,213,110
Non-Accrual	23,433	29,620
Single-family 15-year amortizing fixed-rate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	280,629	293,286
One Month Past Due	1,010	1,196
Two Months Past Due	216	271
Three Months or More Past Due, or in Foreclosure	682	864
Total recorded investment	282,537	295,617
Non-Accrual	682	863
Single-family Adjustable-rate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	66,737	62,987
One Month Past Due	406	495
Two Months Past Due	118	147
Three Months or More Past Due, or in Foreclosure	612	871
Total recorded investment	67,873	64,500
Non-Accrual	612	871
Single-family Alt-A, interest-only, and option ARM
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	53,251	62,356
One Month Past Due	2,368	2,898
Two Months Past Due	948	1,157
Three Months or More Past Due, or in Foreclosure	7,048	10,169
Total recorded investment	63,615	76,580
Non-Accrual	7,045	10,162
Single-family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,608,443	1,575,686
One Month Past Due	21,300	24,332
Two Months Past Due	7,099	8,250
Three Months or More Past Due, or in Foreclosure	31,778	41,539
Total recorded investment	1,668,620	1,649,807
Non-Accrual	31,772	41,516
Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	41,335	50,827
One Month Past Due	7	0
Two Months Past Due	11	21
Three Months or More Past Due, or in Foreclosure	0	26
Total recorded investment	41,353	50,874
Non-Accrual	$385	$627

Impaired_Loans_Delinquency_Rat

Impaired Loans - Delinquency Rates (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	numberofloans	numberofloans
Single-family
Delinquent Mortgage Loan Attributes [Line Items]
Serious delinquency rate	1.88%	2.39%
Total number of seriously delinquent loans	200,069	255,325
Single-family | Non-credit-enhanced portfolio
Delinquent Mortgage Loan Attributes [Line Items]
Serious delinquency rate	1.74%	2.09%
Total number of seriously delinquent loans	150,300	190,119
Single-family | Credit-enhanced portfolio | Primary mortgage insurance
Delinquent Mortgage Loan Attributes [Line Items]
Serious delinquency rate	3.10%	4.40%
Total number of seriously delinquent loans	38,595	51,600
Single-family | Credit-enhanced portfolio | Other credit protection
Delinquent Mortgage Loan Attributes [Line Items]
Serious delinquency rate	1.21%	3.66%
Total number of seriously delinquent loans	12,175	15,828
Multifamily
Delinquent Mortgage Loan Attributes [Line Items]
Delinquency Rate	0.04%	0.09%
UPB of delinquent loans	55	121
Multifamily | Non-credit-enhanced portfolio
Delinquent Mortgage Loan Attributes [Line Items]
Delinquency Rate	0.02%	0.07%
UPB of delinquent loans	11	46
Multifamily | Credit-enhanced portfolio
Delinquent Mortgage Loan Attributes [Line Items]
Delinquency Rate	0.05%	0.11%
UPB of delinquent loans	44	75

Impaired_Loans_TDR_Activity_By

Impaired Loans - TDR Activity, By Segment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	numberofloans	numberofloans
Financing Receivable, Modifications [Line Items]
Number of Loans	86,338	134,591
Post TDR Recorded Investments	$12,865,000,000	$21,452,000,000
Single-family 20 and 30-year or more, amortizing fixed-rate
Financing Receivable, Modifications [Line Items]
Number of Loans	68,186	101,538
Post TDR Recorded Investments	10,172,000,000	16,014,000,000
Single-family 15-year amortizing fixed-rate
Financing Receivable, Modifications [Line Items]
Number of Loans	7,189	11,671
Post TDR Recorded Investments	528,000,000	825,000,000
Single-family Adjustable-rate
Financing Receivable, Modifications [Line Items]
Number of Loans	1,849	3,604
Post TDR Recorded Investments	285,000,000	574,000,000
Single-family Alt-A, interest-only, and option ARM
Financing Receivable, Modifications [Line Items]
Number of Loans	9,112	17,770
Post TDR Recorded Investments	1,865,000,000	3,941,000,000
Single-family
Financing Receivable, Modifications [Line Items]
Number of Loans	86,336	134,583
Post TDR Recorded Investments	12,850,000,000	21,354,000,000
Pre-TDR Recorded Investments	12,800,000,000	21,200,000,000
Multifamily
Financing Receivable, Modifications [Line Items]
Number of Loans	2	8
Post TDR Recorded Investments	$15,000,000	$98,000,000

Impaired_Loans_Payment_Default

Impaired Loans - Payment Defaults of Completed TDR Modifications, by Segment (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	numberofloans	numberofloans
Single-family 20 and 30-year or more, amortizing fixed-rate
Financing Receivable, Modifications and Other Loss Mitigation Activities
Number of Loans, Modifications, Subsequent Default	19,101	14,964
Post-TDR Recorded Investment, Modifications, Subsequent Default	$3,384	$2,766
Single-family 15-year amortizing fixed-rate
Financing Receivable, Modifications and Other Loss Mitigation Activities
Number of Loans, Modifications, Subsequent Default	645	471
Post-TDR Recorded Investment, Modifications, Subsequent Default	62	52
Single-family Adjustable-rate
Financing Receivable, Modifications and Other Loss Mitigation Activities
Number of Loans, Modifications, Subsequent Default	332	237
Post-TDR Recorded Investment, Modifications, Subsequent Default	61	50
Single-family Alt-A, interest-only, and option ARM
Financing Receivable, Modifications and Other Loss Mitigation Activities
Number of Loans, Modifications, Subsequent Default	2,357	2,256
Post-TDR Recorded Investment, Modifications, Subsequent Default	564	587
Single-family
Financing Receivable, Modifications and Other Loss Mitigation Activities
Number of Loans, Modifications, Subsequent Default	22,435	17,928
Post-TDR Recorded Investment, Modifications, Subsequent Default	4,071	3,455
Multifamily
Financing Receivable, Modifications and Other Loss Mitigation Activities
Number of Loans, Modifications, Subsequent Default	0	0
Post-TDR Recorded Investment, Modifications, Subsequent Default	$0	$0

Real_Estate_Owned_Details

Real Estate Owned (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate Acquired Through Foreclosure Data [Line Items]
Real estate owned, net	$2,558,000,000	$4,551,000,000	$4,378,000,000
Gain (Loss) on disposition of REO, net	461,000,000	761,000,000	693,000,000
Increase (Decrease) in REO valuation allowance, inventory	176,000,000	58,000,000	-7,000,000
REO acquired in non-cash transfer	3,800,000,000	6,100,000,000	6,800,000,000
Single Family
Real Estate Acquired Through Foreclosure Data [Line Items]
Real estate owned, net	2,600,000,000	4,500,000,000
REO, number of properties	25,768	47,307
Single Family | Southeast
Real Estate Acquired Through Foreclosure Data [Line Items]
Single-Family REO, percentage of additions	36.00%	34.00%
Single Family | North Central
Real Estate Acquired Through Foreclosure Data [Line Items]
Single-Family REO, percentage of additions	25.00%	29.00%
Multifamily
Real Estate Acquired Through Foreclosure Data [Line Items]
Real estate owned, net	$0	$10,000,000

Real_Estate_Owned_REO_Details

Real Estate Owned - REO (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REO
Beginning balance - REO	$4,602	$4,407	$5,827
Additions	4,110	6,498	7,029
Dispositions	-6,028	-6,303	-8,449
Ending balance - REO	2,684	4,602	4,407
REO, valuation allowance
Beginning balance, valuation allowance	-51	-29	-147
Change in valuation allowance	-75	-22	118
Ending balance, valuation allowance	-126	-51	-29
Ending Balance - REO, net	$2,558	$4,551	$4,378

Investments_in_Securities_Deta

Investments in Securities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	numberoflots
	numberofsecurities
Investments, Debt and Equity Securities [Abstract]
Total Gross Unrealized Losses	$900,000,000
Individual lots in gross unrealized loss position	385
Separate securities in gross unrealized loss position	364
Net unrealized gains (losses) on trading securities held at balance sheets date	-88,000,000	-1,600,000,000	-1,700,000,000
Transfer to Investments	$1,800,000,000

Investments_in_Securities_Avai

Investments in Securities - Available-For-Sale Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$102,633	$127,439
Gross Unrealized Gains	4,861	5,379
Available-for-sale, at fair value	106,550	128,919
Freddie Mac
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	37,710	39,001
Gross Unrealized Gains	1,435	1,847
Available-for-sale, at fair value	39,099	40,659
Fannie Mae
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,860	10,140
Gross Unrealized Gains	463	660
Available-for-sale, at fair value	11,313	10,797
Ginnie Mae
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	183	149
Gross Unrealized Gains	16	18
Available-for-sale, at fair value	199	167
CMBS
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,988	29,151
Gross Unrealized Gains	890	1,524
Available-for-sale, at fair value	21,822	30,338
Subprime
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,210	29,897
Gross Unrealized Gains	989	382
Available-for-sale, at fair value	20,589	27,499
Option ARM
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,460	6,617
Gross Unrealized Gains	372	338
Available-for-sale, at fair value	5,649	6,574
Alt-A and other
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,500	8,322
Gross Unrealized Gains	578	526
Available-for-sale, at fair value	5,043	8,706
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,166	3,533
Gross Unrealized Gains	34	23
Available-for-sale, at fair value	2,198	3,495
Manufactured housing
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	556	629
Gross Unrealized Gains	84	61
Available-for-sale, at fair value	638	684
Other-than-temporary impairment
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-730	-2,995
Other-than-temporary impairment | Freddie Mac
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	0	0
Other-than-temporary impairment | Fannie Mae
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	0	0
Other-than-temporary impairment | Ginnie Mae
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	0	0
Other-than-temporary impairment | CMBS
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-2	-23
Other-than-temporary impairment | Subprime
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-518	-2,467
Other-than-temporary impairment | Option ARM
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-179	-376
Other-than-temporary impairment | Alt-A and other
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-29	-118
Other-than-temporary impairment | Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	0	-7
Other-than-temporary impairment | Manufactured housing
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-2	-4
Temporary impairment
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-214	-904
Temporary impairment | Freddie Mac
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-46	-189
Temporary impairment | Fannie Mae
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-10	-3
Temporary impairment | Ginnie Mae
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	0	0
Temporary impairment | CMBS
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-54	-314
Temporary impairment | Subprime
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-92	-313
Temporary impairment | Option ARM
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-4	-5
Temporary impairment | Alt-A and other
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-6	-24
Temporary impairment | Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	-2	-54
Temporary impairment | Manufactured housing
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	$0	($2)

Investments_in_Securities_Avai1

Investments in Securities - Available-For-Sale Securities in a Gross Unrealized Loss Position (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	$6,112	$12,048
12 Months or Greater Fair Value	10,655	26,314
Less than 12 Months Gross Unrealized Losses	-36	-313
12 Months or Greater Gross Unrealized Losses	-908	-3,586
Freddie Mac
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	2,531	7,957
12 Months or Greater Fair Value	936	649
Less than 12 Months Gross Unrealized Losses	-14	-144
12 Months or Greater Gross Unrealized Losses	-32	-45
Fannie Mae
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	2,693	248
12 Months or Greater Fair Value	5	19
Less than 12 Months Gross Unrealized Losses	-9	-2
12 Months or Greater Gross Unrealized Losses	-1	-1
Ginnie Mae
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	66
12 Months or Greater Fair Value	0
Less than 12 Months Gross Unrealized Losses	0
12 Months or Greater Gross Unrealized Losses	0
CMBS
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	184	1,147
12 Months or Greater Fair Value	1,149	1,992
Less than 12 Months Gross Unrealized Losses	-5	-85
12 Months or Greater Gross Unrealized Losses	-51	-252
Subprime
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	286	472
12 Months or Greater Fair Value	6,533	19,103
Less than 12 Months Gross Unrealized Losses	-3	-19
12 Months or Greater Gross Unrealized Losses	-607	-2,761
Option ARM
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	77	77
12 Months or Greater Fair Value	1,490	2,608
Less than 12 Months Gross Unrealized Losses	0	-2
12 Months or Greater Gross Unrealized Losses	-183	-379
Alt-A and other
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	185	262
12 Months or Greater Fair Value	499	1,854
Less than 12 Months Gross Unrealized Losses	-5	-5
12 Months or Greater Gross Unrealized Losses	-30	-137
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	48	1,885
12 Months or Greater Fair Value	28	24
Less than 12 Months Gross Unrealized Losses	0	-56
12 Months or Greater Gross Unrealized Losses	-2	-5
Manufactured housing
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months Fair Value	42	0
12 Months or Greater Fair Value	15	65
Less than 12 Months Gross Unrealized Losses	0	0
12 Months or Greater Gross Unrealized Losses	($2)	($6)

Investments_in_Securities_Sign

Investments in Securities - Significant Modeled Attributes for Certain Available-For-Sale Non-Agency Mortgage-Related Securities (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Subprime
Schedule of Available-for-sale Securities [Line Items]
UPB	$27,682
Weighted average collateral defaults	48.00%
Weighted average collateral severities	63.00%
Weighted average voluntary prepayment rates	3.00%
Average credit enhancement	9.00%
Option ARM
Schedule of Available-for-sale Securities [Line Items]
UPB	8,287
Weighted average collateral defaults	33.00%
Weighted average collateral severities	47.00%
Weighted average voluntary prepayment rates	8.00%
Average credit enhancement	0.00%
Alt-A Fixed Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	1,158
Weighted average collateral defaults	20.00%
Weighted average collateral severities	46.00%
Weighted average voluntary prepayment rates	12.00%
Average credit enhancement	3.00%
Alt-A Variable Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	1,508
Weighted average collateral defaults	36.00%
Weighted average collateral severities	48.00%
Weighted average voluntary prepayment rates	8.00%
Average credit enhancement	1.00%
Alt-A Hybrid Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	1,883
Weighted average collateral defaults	23.00%
Weighted average collateral severities	41.00%
Weighted average voluntary prepayment rates	11.00%
Average credit enhancement	2.00%
2004 and prior | Subprime
Schedule of Available-for-sale Securities [Line Items]
UPB	534
Weighted average collateral defaults	33.00%
Weighted average collateral severities	61.00%
Weighted average voluntary prepayment rates	7.00%
Average credit enhancement	31.00%
2004 and prior | Option ARM
Schedule of Available-for-sale Securities [Line Items]
UPB	38
Weighted average collateral defaults	19.00%
Weighted average collateral severities	46.00%
Weighted average voluntary prepayment rates	11.00%
Average credit enhancement	0.00%
2004 and prior | Alt-A Fixed Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	335
Weighted average collateral defaults	13.00%
Weighted average collateral severities	45.00%
Weighted average voluntary prepayment rates	13.00%
Average credit enhancement	14.00%
2004 and prior | Alt-A Variable Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	258
Weighted average collateral defaults	30.00%
Weighted average collateral severities	42.00%
Weighted average voluntary prepayment rates	8.00%
Average credit enhancement	11.00%
2004 and prior | Alt-A Hybrid Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	189
Weighted average collateral defaults	15.00%
Weighted average collateral severities	38.00%
Weighted average voluntary prepayment rates	10.00%
Average credit enhancement	13.00%
2005 | Subprime
Schedule of Available-for-sale Securities [Line Items]
UPB	2,667
Weighted average collateral defaults	43.00%
Weighted average collateral severities	63.00%
Weighted average voluntary prepayment rates	4.00%
Average credit enhancement	48.00%
2005 | Option ARM
Schedule of Available-for-sale Securities [Line Items]
UPB	1,743
Weighted average collateral defaults	26.00%
Weighted average collateral severities	47.00%
Weighted average voluntary prepayment rates	10.00%
Average credit enhancement	1.00%
2005 | Alt-A Fixed Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	479
Weighted average collateral defaults	18.00%
Weighted average collateral severities	45.00%
Weighted average voluntary prepayment rates	12.00%
Average credit enhancement	-1.00%
2005 | Alt-A Variable Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	374
Weighted average collateral defaults	37.00%
Weighted average collateral severities	52.00%
Weighted average voluntary prepayment rates	8.00%
Average credit enhancement	17.00%
2005 | Alt-A Hybrid Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	1,107
Weighted average collateral defaults	21.00%
Weighted average collateral severities	41.00%
Weighted average voluntary prepayment rates	11.00%
Average credit enhancement	2.00%
2006 | Subprime
Schedule of Available-for-sale Securities [Line Items]
UPB	11,204
Weighted average collateral defaults	49.00%
Weighted average collateral severities	63.00%
Weighted average voluntary prepayment rates	3.00%
Average credit enhancement	7.00%
2006 | Option ARM
Schedule of Available-for-sale Securities [Line Items]
UPB	4,063
Weighted average collateral defaults	35.00%
Weighted average collateral severities	47.00%
Weighted average voluntary prepayment rates	8.00%
Average credit enhancement	-3.00%
2006 | Alt-A Fixed Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	226
Weighted average collateral defaults	25.00%
Weighted average collateral severities	44.00%
Weighted average voluntary prepayment rates	10.00%
Average credit enhancement	-2.00%
2006 | Alt-A Variable Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	418
Weighted average collateral defaults	38.00%
Weighted average collateral severities	48.00%
Weighted average voluntary prepayment rates	8.00%
Average credit enhancement	1.00%
2006 | Alt-A Hybrid Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	422
Weighted average collateral defaults	30.00%
Weighted average collateral severities	41.00%
Weighted average voluntary prepayment rates	10.00%
Average credit enhancement	-4.00%
2007 | Subprime
Schedule of Available-for-sale Securities [Line Items]
UPB	13,277
Weighted average collateral defaults	49.00%
Weighted average collateral severities	63.00%
Weighted average voluntary prepayment rates	3.00%
Average credit enhancement	1.00%
2007 | Option ARM
Schedule of Available-for-sale Securities [Line Items]
UPB	2,443
Weighted average collateral defaults	34.00%
Weighted average collateral severities	48.00%
Weighted average voluntary prepayment rates	8.00%
Average credit enhancement	3.00%
2007 | Alt-A Fixed Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	118
Weighted average collateral defaults	40.00%
Weighted average collateral severities	51.00%
Weighted average voluntary prepayment rates	7.00%
Average credit enhancement	-1.00%
2007 | Alt-A Variable Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	458
Weighted average collateral defaults	38.00%
Weighted average collateral severities	49.00%
Weighted average voluntary prepayment rates	8.00%
Average credit enhancement	-19.00%
2007 | Alt-A Hybrid Rate
Schedule of Available-for-sale Securities [Line Items]
UPB	$165
Weighted average collateral defaults	29.00%
Weighted average collateral severities	43.00%
Weighted average voluntary prepayment rates	10.00%
Average credit enhancement	0.00%

Investments_in_Securities_Net_

Investments in Securities - Net Impairment of Available-For-Sale Securities Recognized in Earnings (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Net impairment of available-for-sale securities recognized in earnings	($938)	($1,510)	($2,168)
Net impairment charge in earnings due to change from intent to keep to sell	817	568	0
CMBS
Schedule of Available-for-sale Securities [Line Items]
Net impairment of available-for-sale securities recognized in earnings	0	-14	-138
Subprime
Schedule of Available-for-sale Securities [Line Items]
Net impairment of available-for-sale securities recognized in earnings	-794	-1,258	-1,274
Option ARM
Schedule of Available-for-sale Securities [Line Items]
Net impairment of available-for-sale securities recognized in earnings	-101	-58	-556
Alt-A and other
Schedule of Available-for-sale Securities [Line Items]
Net impairment of available-for-sale securities recognized in earnings	-42	-179	-196
Manufactured housing
Schedule of Available-for-sale Securities [Line Items]
Net impairment of available-for-sale securities recognized in earnings	($1)	($1)	($4)

Investments_in_Securities_Othe

Investments in Securities - Other-Than-Temporary Impairments Related to Credit Losses on Available-For-Sale Securities (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Credit-related other-than-temporary impairments on available-for-sale securities recognized in earnings:
Beginning balance - remaining credit losses on available-for-sale securities where other-than-temporary impairments were recognized in earnings	$14,463	$16,745
Amounts related to credit losses for which an other-than-temporary impairment was not previously recognized	0	46
Amounts related to credit losses for which an other-than-temporary impairment was previously recognized	121	896
Amounts related to securities which were sold, written off or matured	-1,188	-1,193
Amounts for which we intend to sell the security or it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis	-6,113	-1,536
Amounts related to amortization resulting from significant increases in cash flows expected to be collected and/or due to the passage of time that are recognized over the remaining life of the security	-485	-495
Ending balance - remaining credit losses on available-for-sale securities where other-than-temporary impairments were recognized in earnings	$6,798	$14,463

Investments_in_Securities_Gros

Investments in Securities - Gross Realized Gains and Gross Realized Losses on Sales of Available-For-Sale Securities (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$1,897	$1,950	$152
Gross realized losses	-185	-51	0
Net realized gains (losses)	$1,712	$1,899	$152

Investments_in_Securities_Matu

Investments in Securities - Maturities of Available-For-Sale Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Amortized Cost
Due within 1 year or less	$2
Due after 1 through 5 years	752
Due after 5 through 10 years	723
Due after 10 years	101,156
Amortized Cost	102,633	127,439
Fair Value
Due within 1 year or less	2
Due after 1 through 5 years	781
Due after 5 through 10 years	775
Due after 10 years	104,992
Fair Value	106,550	128,919
Weighted Average Yield
Due within one year or less	7.63%
Due after One through five years	5.04%
Due after five through ten years	5.10%
Due after ten years	2.61%
Weighted Average Yield	2.65%
Freddie Mac
Amortized Cost
Due within 1 year or less	0
Due after 1 through 5 years	300
Due after 5 through 10 years	526
Due after 10 years	36,884
Amortized Cost	37,710	39,001
Fair Value
Due within 1 year or less	0
Due after 1 through 5 years	309
Due after 5 through 10 years	559
Due after 10 years	38,231
Fair Value	39,099	40,659
Fannie Mae
Amortized Cost
Due within 1 year or less	1
Due after 1 through 5 years	61
Due after 5 through 10 years	108
Due after 10 years	10,690
Amortized Cost	10,860	10,140
Fair Value
Due within 1 year or less	1
Due after 1 through 5 years	64
Due after 5 through 10 years	120
Due after 10 years	11,128
Fair Value	11,313	10,797
Ginnie Mae
Amortized Cost
Due within 1 year or less	0
Due after 1 through 5 years	4
Due after 5 through 10 years	22
Due after 10 years	157
Amortized Cost	183	149
Fair Value
Due within 1 year or less	0
Due after 1 through 5 years	4
Due after 5 through 10 years	26
Due after 10 years	169
Fair Value	199	167
CMBS
Amortized Cost
Due within 1 year or less	0
Due after 1 through 5 years	316
Due after 5 through 10 years	8
Due after 10 years	20,664
Amortized Cost	20,988	29,151
Fair Value
Due within 1 year or less	0
Due after 1 through 5 years	330
Due after 5 through 10 years	8
Due after 10 years	21,484
Fair Value	21,822	30,338
Subprime
Amortized Cost
Due within 1 year or less	0
Due after 1 through 5 years	0
Due after 5 through 10 years	0
Due after 10 years	20,210
Amortized Cost	20,210	29,897
Fair Value
Due within 1 year or less	0
Due after 1 through 5 years	0
Due after 5 through 10 years	0
Due after 10 years	20,589
Fair Value	20,589	27,499
Option ARM
Amortized Cost
Due within 1 year or less	0
Due after 1 through 5 years	0
Due after 5 through 10 years	0
Due after 10 years	5,460
Amortized Cost	5,460	6,617
Fair Value
Due within 1 year or less	0
Due after 1 through 5 years	0
Due after 5 through 10 years	0
Due after 10 years	5,649
Fair Value	5,649	6,574
Alt-A and other
Amortized Cost
Due within 1 year or less	1
Due after 1 through 5 years	31
Due after 5 through 10 years	2
Due after 10 years	4,466
Amortized Cost	4,500	8,322
Fair Value
Due within 1 year or less	1
Due after 1 through 5 years	31
Due after 5 through 10 years	2
Due after 10 years	5,009
Fair Value	5,043	8,706
Obligations of states and political subdivisions
Amortized Cost
Due within 1 year or less	0
Due after 1 through 5 years	40
Due after 5 through 10 years	48
Due after 10 years	2,078
Amortized Cost	2,166	3,533
Fair Value
Due within 1 year or less	0
Due after 1 through 5 years	43
Due after 5 through 10 years	49
Due after 10 years	2,106
Fair Value	2,198	3,495
Manufactured housing
Amortized Cost
Due within 1 year or less	0
Due after 1 through 5 years	0
Due after 5 through 10 years	9
Due after 10 years	547
Amortized Cost	556	629
Fair Value
Due within 1 year or less	0
Due after 1 through 5 years	0
Due after 5 through 10 years	11
Due after 10 years	627
Fair Value	$638	$684

Investments_in_Securities_Trad

Investments in Securities - Trading Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Trading Securities [Line Items]
Total fair value of trading securities	$30,437	$23,404
Mortage-related securities
Trading Securities [Line Items]
Total fair value of trading securities	23,755	16,768
Freddie Mac
Trading Securities [Line Items]
Total fair value of trading securities	17,469	9,349
Fannie Mae
Trading Securities [Line Items]
Total fair value of trading securities	6,099	7,180
Ginnie Mae
Trading Securities [Line Items]
Total fair value of trading securities	16	98
Other
Trading Securities [Line Items]
Total fair value of trading securities	171	141
U.S. Treasury securities
Trading Securities [Line Items]
Total fair value of trading securities	$6,682	$6,636

Debt_Securities_and_Subordinat2

Debt Securities and Subordinated Borrowings (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Debt limit as percentage of mortgage assets	120.00%
Debt cap under Purchase Agreement for the current year	$663,000,000,000
Debt cap under Purchase Agreement for the following year	563,600,000,000
Aggregate indebtedness as the par value of other debt	454,000,000,000
Federal funds purchased and securities sold under agreements to repurchase	$0	$0

Debt_Securities_and_Subordinat3

Debt Securities and Subordinated Borrowings - Other Short-Term Debt (Details) (Freddie Mac parent, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Short-term Debt [Line Items]
Other short-term debt par value	$134,670	$141,767
Other short-term debt carrying amount	134,619	141,712
Other short-term debt weighted average effective rate	0.12%	0.13%
Reference Bills securites and discount notes
Short-term Debt [Line Items]
Other short-term debt par value	134,670	137,767
Other short-term debt carrying amount	134,619	137,712
Other short-term debt weighted average effective rate	0.12%	0.13%
Medium-term notes
Short-term Debt [Line Items]
Other short-term debt par value	0	4,000
Other short-term debt carrying amount	$0	$4,000
Other short-term debt weighted average effective rate	0.00%	0.16%

Debt_Securities_and_Subordinat4

Debt Securities and Subordinated Borrowings - Other Long-Term Debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Long-term Debt [Line Items]
Other long-term debt, fair value	$5,820	$2,683
Freddie Mac parent
Long-term Debt [Line Items]
Other long-term debt par value	319,359	369,578
Other long-term debt carrying amount	315,450	365,055
Other long-term debt weighted average effective rate	2.02%	2.08%
Other long-term debt, fair value	5,800	2,600
Freddie Mac parent | Other senior debt:
Long-term Debt [Line Items]
Other long-term debt par value	318,806	369,025
Other long-term debt carrying amount	315,028	364,653
Freddie Mac parent | Hedging-related basis adjustment
Long-term Debt [Line Items]
Other long-term debt carrying amount	34	41
Freddie Mac parent | Other subordinated debt:
Long-term Debt [Line Items]
Other long-term debt par value	553	553
Other long-term debt carrying amount	422	402
Freddie Mac parent | Fixed-rate | Medium-term notes - callable
Long-term Debt [Line Items]
Other long-term debt par value	98,860	101,190
Other long-term debt carrying amount	98,856	101,236
Other long-term debt weighted average effective rate	1.35%	1.51%
Freddie Mac parent | Fixed-rate | Medium-term notes - non-callable
Long-term Debt [Line Items]
Other long-term debt par value	20,059	37,878
Other long-term debt carrying amount	20,383	38,107
Other long-term debt weighted average effective rate	0.86%	0.99%
Freddie Mac parent | Fixed-rate | U.S. dollar Reference Notes securities - non-callable
Long-term Debt [Line Items]
Other long-term debt par value	151,701	190,371
Other long-term debt carrying amount	151,751	190,406
Other long-term debt weighted average effective rate	2.80%	2.71%
Freddie Mac parent | Fixed-rate | Euro Reference Notes securities - non-callable
Long-term Debt [Line Items]
Other long-term debt par value	0	528
Other long-term debt carrying amount	0	529
Other long-term debt weighted average effective rate		4.38%
Freddie Mac parent | Fixed-rate | Other subordinated debt:
Long-term Debt [Line Items]
Other long-term debt par value	221	221
Other long-term debt carrying amount	219	218
Other long-term debt weighted average effective rate	6.60%	6.60%
Freddie Mac parent | Variable-rate | Medium-term notes - callable
Long-term Debt [Line Items]
Other long-term debt par value	7,210	6,001
Other long-term debt carrying amount	7,210	6,001
Other long-term debt weighted average effective rate	2.00%	1.66%
Freddie Mac parent | Variable-rate | Medium-term notes - non-callable
Long-term Debt [Line Items]
Other long-term debt par value	23,971	18,533
Other long-term debt carrying amount	23,971	18,533
Other long-term debt weighted average effective rate	0.19%	0.22%
Freddie Mac parent | Variable-rate | STACR
Long-term Debt [Line Items]
Other long-term debt par value	5,896	1,107
Other long-term debt carrying amount	5,820	1,155
Other long-term debt weighted average effective rate	3.16%	4.29%
Freddie Mac parent | Zero-coupon | Medium-term notes - callable
Long-term Debt [Line Items]
Other long-term debt par value	1,000	1,200
Other long-term debt carrying amount	264	311
Other long-term debt weighted average effective rate	6.17%	5.82%
Freddie Mac parent | Zero-coupon | Medium-term notes - non-callable
Long-term Debt [Line Items]
Other long-term debt par value	10,109	12,217
Other long-term debt carrying amount	6,739	8,334
Other long-term debt weighted average effective rate	2.53%	3.08%
Freddie Mac parent | Zero-coupon | Other subordinated debt:
Long-term Debt [Line Items]
Other long-term debt par value	332	332
Other long-term debt carrying amount	$203	$184
Other long-term debt weighted average effective rate	10.51%	10.51%

Debt_Securities_and_Subordinat5

Debt Securities and Subordinated Borrowings - Debt Securities of Consolidated Trusts Held by Third Parties (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Debt Securities Of Consolidated Trusts Held By Third Parties [Line Items]
Balance, Net	$1,929,542	$1,940,751
Variable Interest Entity Primary Beneficiary
Debt Securities Of Consolidated Trusts Held By Third Parties [Line Items]
UPB	1,440,325	1,399,456
Balance, Net	1,479,473	1,433,984
Effective rate for debt securities of consolidated trusts held by third parties	3.19%	3.39%
Variable Interest Entity Primary Beneficiary | Single-family
Debt Securities Of Consolidated Trusts Held By Third Parties [Line Items]
UPB	1,439,801	1,399,012
Balance, Net	1,478,896	1,433,476
Variable Interest Entity Primary Beneficiary | Multifamily
Debt Securities Of Consolidated Trusts Held By Third Parties [Line Items]
UPB	524	444
Balance, Net	577	508
Weighted Average Coupon	4.93%	4.96%
Variable Interest Entity Primary Beneficiary | Single-family 30-year or more, fixed-rate | Single-family
Debt Securities Of Consolidated Trusts Held By Third Parties [Line Items]
UPB	1,018,357	969,270
Balance, Net	1,047,302	993,683
Weighted Average Coupon	4.04%	4.14%
Variable Interest Entity Primary Beneficiary | Single-family 20-year fixed-rate | Single-family
Debt Securities Of Consolidated Trusts Held By Third Parties [Line Items]
UPB	71,545	75,910
Balance, Net	73,764	78,252
Weighted Average Coupon	3.74%	3.81%
Variable Interest Entity Primary Beneficiary | Single-family 15-year fixed-rate | Single-family
Debt Securities Of Consolidated Trusts Held By Third Parties [Line Items]
UPB	266,117	270,513
Balance, Net	272,538	277,018
Weighted Average Coupon	3.13%	3.23%
Variable Interest Entity Primary Beneficiary | Single-family Adjustable-rate | Single-family
Debt Securities Of Consolidated Trusts Held By Third Parties [Line Items]
UPB	65,082	60,683
Balance, Net	66,518	61,830
Weighted Average Coupon	2.62%	2.64%
Variable Interest Entity Primary Beneficiary | Single-family Interest-only | Single-family
Debt Securities Of Consolidated Trusts Held By Third Parties [Line Items]
UPB	17,474	21,352
Balance, Net	17,524	21,390
Weighted Average Coupon	3.29%	3.70%
Variable Interest Entity Primary Beneficiary | FHA/VA | Single-family
Debt Securities Of Consolidated Trusts Held By Third Parties [Line Items]
UPB	1,226	1,284
Balance, Net	$1,250	$1,303
Weighted Average Coupon	5.42%	5.67%

Debt_Securities_and_Subordinat6

Debt Securities and Subordinated Borrowings - Contractual Maturity of Other Long-term Debt and Debt Securities of Consolidated Trusts Held by Third Parties (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Annual Maturities - Par Value
Total	$1,759,684
Net discounts, premiums, hedge-related and other basis adjustments	35,239
Total debt securities of consolidated trusts held by third parties and other long-term debt	1,794,923
Freddie Mac parent
Annual Maturities - Par Value
Other long-term debt - 2015	58,841
Other long-term debt - 2016	72,503
Other long-term debt - 2017	77,482
Other long-term debt - 2018	30,850
Other long-term debt - 2019	30,671
Other long-term debt - Thereafter	49,012
Variable Interest Entity Primary Beneficiary
Annual Maturities - Par Value
Debt securities of consolidated trusts held by third parties	$1,440,325	$1,399,456

Derivatives_Details

Derivatives (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	category
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Number of derivative categories	3
Derivatives in Hedge Accounting Relationships	$0	$0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	($303,000,000)	($460,000,000)

Derivatives_Derivative_Assets_

Derivatives - Derivative Assets and Liabilities at Fair Value (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Derivative [Line Items]
Netting adjustments to derivative assets	($9,939)	($14,411)
Derivative assets, net	822	1,063
Netting adjustments to derivative liabilities	13,097	15,282
Derivative liabilities, net	-1,963	-180
Net cash collateral posted	3,200	871
Commitments
Derivative [Line Items]
Derivative assets at fair value	40	61
Derivatives
Derivative [Line Items]
Net cash collateral posted	3,200	871
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional or contractual amount	607,040	725,026
Derivative assets at fair value	9,944	14,231
Derivative interest receivable	817	1,243
Netting adjustments to derivative assets	-9,939	-14,411
Derivative assets, net	822	1,063
Derivative liabilities at fair value	-13,560	-13,627
Derivative interest payable	-1,500	-1,835
Netting adjustments to derivative liabilities	13,097	15,282
Derivative liabilities, net	-1,963	-180
Not Designated as Hedging Instrument | Interest Rate Swaps
Derivative [Line Items]
Notional or contractual amount	418,844	524,624
Derivative assets at fair value	5,653	10,019
Derivative liabilities at fair value	-13,316	-13,317
Not Designated as Hedging Instrument | Receive-fixed
Derivative [Line Items]
Notional or contractual amount	205,219	281,727
Derivative assets at fair value	5,243	4,475
Derivative liabilities at fair value	-487	-2,438
Not Designated as Hedging Instrument | Pay-fixed
Derivative [Line Items]
Notional or contractual amount	213,325	242,597
Derivative assets at fair value	408	5,540
Derivative liabilities at fair value	-12,829	-10,879
Not Designated as Hedging Instrument | Basis (floating to floating)
Derivative [Line Items]
Notional or contractual amount	300	300
Derivative assets at fair value	2	4
Derivative liabilities at fair value	0	0
Not Designated as Hedging Instrument | Option-based
Derivative [Line Items]
Notional or contractual amount	112,468	122,010
Derivative assets at fair value	4,224	4,112
Derivative liabilities at fair value	-127	-204
Not Designated as Hedging Instrument | Call swaptions | Purchased
Derivative [Line Items]
Notional or contractual amount	56,390	59,290
Derivative assets at fair value	3,315	2,373
Derivative liabilities at fair value	0	0
Not Designated as Hedging Instrument | Call swaptions | Written
Derivative [Line Items]
Notional or contractual amount	10,660	5,945
Derivative assets at fair value	0	0
Derivative liabilities at fair value	-90	-201
Not Designated as Hedging Instrument | Put swaptions | Purchased
Derivative [Line Items]
Notional or contractual amount	22,125	33,410
Derivative assets at fair value	179	698
Derivative liabilities at fair value	0	0
Not Designated as Hedging Instrument | Put swaptions | Written
Derivative [Line Items]
Notional or contractual amount	3,560	0
Derivative assets at fair value	0	0
Derivative liabilities at fair value	-9	0
Not Designated as Hedging Instrument | Other option-based derivatives
Derivative [Line Items]
Notional or contractual amount	19,733	23,365
Derivative assets at fair value	730	1,041
Derivative liabilities at fair value	-28	-3
Not Designated as Hedging Instrument | Futures
Derivative [Line Items]
Notional or contractual amount	40,263	50,270
Derivative assets at fair value	0	0
Derivative liabilities at fair value	0	0
Not Designated as Hedging Instrument | Foreign-currency swaps
Derivative [Line Items]
Notional or contractual amount	0	528
Derivative assets at fair value	0	39
Derivative liabilities at fair value	0	0
Not Designated as Hedging Instrument | Commitments
Derivative [Line Items]
Notional or contractual amount	27,054	18,731
Derivative assets at fair value	40	61
Derivative liabilities at fair value	-79	-69
Not Designated as Hedging Instrument | Credit derivatives
Derivative [Line Items]
Notional or contractual amount	5,207	5,386
Derivative assets at fair value	27	0
Derivative liabilities at fair value	-11	-6
Not Designated as Hedging Instrument | Swap guarantee derivatives
Derivative [Line Items]
Notional or contractual amount	3,204	3,477
Derivative assets at fair value	0	0
Derivative liabilities at fair value	($27)	($31)

Derivatives_Gains_and_Losses_o

Derivatives - Gains and Losses on Derivatives (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	($8,291)	$2,632	($2,448)
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	-8,291	2,632	-2,448
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	-5,666	6,099	1,354
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Interest Rate Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	-7,294	8,598	-204
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Receive-fixed
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	4,073	-10,421	2,653
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Foreign-currency denominated
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	-1	-21	-33
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | U.S. dollar denominated
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	4,074	-10,400	2,686
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Pay-fixed
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	-11,366	19,021	-2,865
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Basis (floating to floating)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	-1	-2	8
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Option-based
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	1,437	-2,422	1,250
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Call swaptions | Purchased
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	2,355	-2,547	1,365
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Call swaptions | Written
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	-168	546	-38
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Put swaptions | Purchased
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	-1,006	-8	-273
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Put swaptions | Written
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	8	0	6
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Other option-based derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	248	-413	190
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Futures
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	-54	21	12
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Foreign-currency swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	-7	30	-8
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Commitments
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	239	-131	298
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Credit derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	8	-3	0
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Swap guarantee derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	8	9	7
Not Designated as Hedging Instrument | Derivative gains (losses) excluding accrual of periodic settlements | Other
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	-3	-3	-1
Not Designated as Hedging Instrument | Accrual of periodic settlements
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	-2,625	-3,467	-3,802
Not Designated as Hedging Instrument | Accrual of periodic settlements | Receive-fixed
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	3,033	3,764	3,511
Not Designated as Hedging Instrument | Accrual of periodic settlements | Pay-fixed
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	-5,660	-7,233	-7,318
Not Designated as Hedging Instrument | Accrual of periodic settlements | Foreign-currency swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	0	0	4
Not Designated as Hedging Instrument | Accrual of periodic settlements | Other
Derivative Instruments, Gain (Loss) [Line Items]
Derivative gains (losses)	$2	$2	$1

Collateral_and_Offsetting_of_A2

Collateral and Offsetting of Assets and Liabilities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	numberofcounterparties
Offsetting of Financial Assets and Liabilities [Line Items]
Derivative collateral, obligation to return cash	0	$0
Derivative collateral, right to reclaim cash	0	0
Net uncollateralized exposure after applying netting agreements and collateral	369,000,000	631,000,000
Securities collateral pledged to Freddie Mac offsetting our exposure	453,000,000	432,000,000
Federal funds sold	0	0
Derivatives in a net liability position	3,000,000,000
Collateral already posted, aggregate fair value	3,000,000,000
Securities pledged with the ability for the secured party to repledge	4,432,000,000	11,089,000,000
Collateral pledged by Freddie Mac in form of cash	5,400,000,000	3,400,000,000
Securities purchased under agreements to resell
Offsetting of Financial Assets and Liabilities [Line Items]
Collateral pledged to Freddie Mac in form of securities	0	5,000,000,000
Secured uncommitted line of credit
Offsetting of Financial Assets and Liabilities [Line Items]
Securities pledged with the ability for the secured party to repledge		10,500,000,000
Derivatives and securities
Offsetting of Financial Assets and Liabilities [Line Items]
Collateral pledged by Freddie Mac in form of cash	4,200,000,000	275,000,000
Derivatives
Offsetting of Financial Assets and Liabilities [Line Items]
Securities pledged with the ability for the secured party to repledge		600,000,000
Commitments
Offsetting of Financial Assets and Liabilities [Line Items]
Total exposure on our commitments	40,000,000	61,000,000
OTC derivatives
Offsetting of Financial Assets and Liabilities [Line Items]
Net uncollateralized exposure after applying netting agreements and collateral	174,000,000	188,000,000
Maximum loss after applying netting agreements and collateral	174,000,000
Collateral pledged to Freddie Mac in form of cash	2,100,000,000	1,900,000,000
Securities collateral pledged to Freddie Mac offsetting our exposure	453,000,000	432,000,000
Derivatives in a net liability position	3,000,000,000	3,200,000,000
Collateral pledged by Freddie Mac in form of cash	1,200,000,000	3,200,000,000
OTC derivatives | Counterparties accounted for 10% or more | Net uncollateralized exposure to derivative counterparties
Offsetting of Financial Assets and Liabilities [Line Items]
Number of counterparties	3
Concentration risk percentage	81.00%
OTC derivatives | Counterparties accounted for 10% or more | Net uncollateralized exposure to derivative counterparties | S&P Equivalent A or above Rating
Offsetting of Financial Assets and Liabilities [Line Items]
Number of counterparties	3
Cleared and exchange-traded derivatives
Offsetting of Financial Assets and Liabilities [Line Items]
Net uncollateralized exposure after applying netting agreements and collateral	128,000,000	382,000,000
Collateral pledged to Freddie Mac in form of cash	0	646,000,000
Securities collateral pledged to Freddie Mac offsetting our exposure	0	$0

Collateral_and_Offsetting_of_A3

Collateral and Offsetting of Assets and Liabilities - Offsetting of Financial Assets and Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Derivative Assets:
Gross Amount Recognized	$10,761,000,000	$15,474,000,000
Amount Offset in the Consolidated Balance Sheets	-9,939,000,000	-14,411,000,000
Net Amount Presented in the Consolidated Balance Sheets	822,000,000	1,063,000,000
Gross Amount Not Offset in the Consolidated Balance Sheets	-453,000,000	-432,000,000
Net Amount	369,000,000	631,000,000
Securities purchased under agreements to resell:
Gross Amount Recognized	51,903,000,000	62,383,000,000
Amount Offset in the Consolidated Balance Sheets	0	0
Net Amount Presented in the Consolidated Balance Sheets	51,903,000,000	62,383,000,000
Gross Amount Not Offset in the Consolidated Balance Sheets	-51,903,000,000	-62,383,000,000
Net Amount	0	0
Total:
Gross Amount Recognized	62,664,000,000	77,857,000,000
Amount Offset in the Consolidated Balance Sheets	-9,939,000,000	-14,411,000,000
Net Amount Presented in the Consolidated Balance Sheets	52,725,000,000	63,446,000,000
Gross Amount Not Offset in the Consolidated Balance Sheets	-52,356,000,000	-62,815,000,000
Net Amount	369,000,000	631,000,000
Derivative Liabilities:
Gross Amount Recognized	-15,060,000,000	-15,462,000,000
Amount Offset in the Consolidated Balance Sheets	13,097,000,000	15,282,000,000
Net Amount Presented in the Consolidated Balance Sheets	-1,963,000,000	-180,000,000
Gross Amount Not Offset in the Consolidated Balance Sheets	1,743,000,000	0
Net Amount	-220,000,000	-180,000,000
Over-the-counter interest-rate and foreign-currency swaps, and option-based derivatives
Derivative Assets:
Gross Amount Recognized	10,315,000,000	13,886,000,000
Amount Offset in the Consolidated Balance Sheets	-9,688,000,000	-13,266,000,000
Net Amount Presented in the Consolidated Balance Sheets	627,000,000	620,000,000
Gross Amount Not Offset in the Consolidated Balance Sheets	-453,000,000	-432,000,000
Net Amount	174,000,000	188,000,000
Derivative Liabilities:
Gross Amount Recognized	-10,666,000,000	-14,616,000,000
Amount Offset in the Consolidated Balance Sheets	8,845,000,000	14,545,000,000
Net Amount Presented in the Consolidated Balance Sheets	-1,821,000,000	-71,000,000
Gross Amount Not Offset in the Consolidated Balance Sheets	1,743,000,000	0
Net Amount	-78,000,000	-71,000,000
Cleared and exchange-traded derivatives
Derivative Assets:
Gross Amount Recognized	379,000,000	1,527,000,000
Amount Offset in the Consolidated Balance Sheets	-251,000,000	-1,145,000,000
Net Amount Presented in the Consolidated Balance Sheets	128,000,000	382,000,000
Gross Amount Not Offset in the Consolidated Balance Sheets	0	0
Net Amount	128,000,000	382,000,000
Derivative Liabilities:
Gross Amount Recognized	-4,277,000,000	-737,000,000
Amount Offset in the Consolidated Balance Sheets	4,252,000,000	737,000,000
Net Amount Presented in the Consolidated Balance Sheets	-25,000,000	0
Gross Amount Not Offset in the Consolidated Balance Sheets	0	0
Net Amount	-25,000,000	0
Aggregate fair value of securities posted	2,300,000,000	600,000,000
Other
Derivative Assets:
Gross Amount Recognized	67,000,000	61,000,000
Amount Offset in the Consolidated Balance Sheets	0	0
Net Amount Presented in the Consolidated Balance Sheets	67,000,000	61,000,000
Gross Amount Not Offset in the Consolidated Balance Sheets	0	0
Net Amount	67,000,000	61,000,000
Derivative Liabilities:
Gross Amount Recognized	-117,000,000	-109,000,000
Amount Offset in the Consolidated Balance Sheets	0	0
Net Amount Presented in the Consolidated Balance Sheets	-117,000,000	-109,000,000
Gross Amount Not Offset in the Consolidated Balance Sheets	0	0
Net Amount	($117,000,000)	($109,000,000)

Collateral_and_Offsetting_of_A4

Collateral and Offsetting of Assets and Liabilities - Collateral in the Form of Securities Pledged (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Collateral in the Form of Securities Pledged [Line Items]
Securities pledged with the ability for the secured party to repledge	$4,432	$11,089
Debt securities of consolidated trusts held by third parties
Collateral in the Form of Securities Pledged [Line Items]
Securities pledged with the ability for the secured party to repledge	2,539	10,654
Available-for-sale securities
Collateral in the Form of Securities Pledged [Line Items]
Securities pledged with the ability for the secured party to repledge	9	70
Trading securities
Collateral in the Form of Securities Pledged [Line Items]
Securities pledged with the ability for the secured party to repledge	$1,884	$365

Stockholders_Equity_Deficit_De

Stockholders' Equity (Deficit) (Details) (USD $)	3 Months Ended				12 Months Ended			0 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 08, 2008	Jul. 08, 2010
	numberofsecurities				numberofsecurities				numberofsecurities
Stockholders Equity Text [Line Items]
Federal statutory tax rate					35.00%	35.00%	35.00%
Total AOCI related to derivatives designated as cash flow hedges	($803,000,000)				($803,000,000)	($1,000,000,000)
Cash flow hedge gain (loss) to be reclassified over the next 12 months					-166,000,000
Maximum remaining length of time hedged in cash flow hedge					19 years
Cash dividends paid on senior preferred stock	2,800,000,000	1,900,000,000	4,500,000,000	10,400,000,000	19,610,000,000	47,591,000,000	7,233,000,000
Draw received from Treasury					0		165,000,000
Expected draw request from Treasury	0				0
Applicable capital reserve amount	2,400,000,000				2,400,000,000	3,000,000,000
Applicable capital reserve amount for 2018	0				0
Senior preferred stock dividend payable to Treasury in the following quarter	851,000,000				851,000,000
Aggregate liquidation preference on senior preferred stock	72,336,000,000				72,336,000,000	72,336,000,000
Common stock warrant, percentage of common stock shares that can be purchased	79.90%				79.90%
Common stock warrant, exercise price per share	$0.00				$0.00
Common stock warrant, amount outstanding	2,300,000,000				2,300,000,000
Number of preferred stock classes	24				24
Common shares or non-cumulative preferred stock repurchased					0	0
Common shares or non-cumulative preferred stock issued					0	0
Antidilutive potential common shares					494,227	998,707	1,606,097
Common dividends declared					0
Dividends declared on preferred stock					0
Dividends paid on preferred stock					0
Number of preferred stock classes delisted									20
Year 2015
Stockholders Equity Text [Line Items]
Applicable capital reserve amount	1,800,000,000				1,800,000,000
Senior Preferred Stock
Stockholders Equity Text [Line Items]
Senior preferred stock, shares issued								1,000,000
Senior preferred stock, par value per share	$1				$1
Initial Liquidation Preference Price Per Share	$1,000				$1,000
Senior Preferred Stock, Dividend Rate							10.00%
Aggregate liquidation preference on senior preferred stock	$72,336,000,000				$72,336,000,000
Common Stock
Stockholders Equity Text [Line Items]
OTCQB Symbol					FMCC
Restricted stock units
Stockholders Equity Text [Line Items]
Restricted stock units lapsed					6,610
Restricted stock outstanding	13,731				13,731
Restricted stock
Stockholders Equity Text [Line Items]
Restricted stock outstanding	41,160				41,160	41,160
Stock options
Stockholders Equity Text [Line Items]
Stock options exercised					0
Stock options forfeited or expired					457,430
Stock options outstanding	359,005				359,005

Stockholders_Equity_Changes_in

Stockholders' Equity - Changes in AOCI by Component, Net of Tax (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	($6,000,000)
Total other comprehensive income (loss), net of taxes and reclassification adjustments	1,736,000,000	2,932,000,000	5,057,000,000
Ending balance	1,730,000,000	-6,000,000
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	-6,000,000	-2,938,000,000
Other comprehensive income (loss) before reclassifications	2,044,000,000	2,828,000,000
Amounts reclassified from accumulated other comprehensive income	-308,000,000	104,000,000
Total other comprehensive income (loss), net of taxes and reclassification adjustments	1,736,000,000	2,932,000,000	5,057,000,000
Ending balance	1,730,000,000	-6,000,000	-2,938,000,000
AOCI related to available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	962,000,000	-1,444,000,000
Other comprehensive income (loss) before reclassifications	2,087,000,000	2,659,000,000
Amounts reclassified from accumulated other comprehensive income	-503,000,000	-253,000,000
Total other comprehensive income (loss), net of taxes and reclassification adjustments	1,584,000,000	2,406,000,000
Ending balance	2,546,000,000	962,000,000
Tax expense related to AFS - other comprehensive income before reclassifications	1,100,000,000	1,400,000,000
AOCI related to cash flow hedge relationships
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	-1,000,000,000	-1,316,000,000
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	197,000,000	316,000,000
Total other comprehensive income (loss), net of taxes and reclassification adjustments	197,000,000	316,000,000
Ending balance	-803,000,000	-1,000,000,000
AOCI related to defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	32,000,000	-178,000,000
Other comprehensive income (loss) before reclassifications	-43,000,000	169,000,000
Amounts reclassified from accumulated other comprehensive income	-2,000,000	41,000,000
Total other comprehensive income (loss), net of taxes and reclassification adjustments	-45,000,000	210,000,000
Ending balance	($13,000,000)	$32,000,000

Stockholders_Equity_Reclassifi

Stockholders' Equity - Reclassifications from AOCI to Net Income (Details) (USD $)	12 Months Ended			3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other gains (losses) on investment securities recognized in earnings	$1,494	$301	($1,522)
Net impairment of available-for-sale securities recognized in earnings	-938	-1,510	-2,168
Total interest expense	-54,916	-55,779	-66,502
Expense related to derivatives	-301	-455	-605
Salaries and employee benefits	-914	-833	-810
Income before income tax (expense) benefit	11,002	25,363	9,445
Income tax (expense) benefit	-3,312	23,305	1,537
Net income	7,690	48,668	10,982
Total reclassifications in the period
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net income	308	-104		116	-478
AOCI related to available-for-sale securities | Total reclassifications in the period
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other gains (losses) on investment securities recognized in earnings	1,712	1,899		500	717
Net impairment of available-for-sale securities recognized in earnings	-938	-1,510		-251	-1,297
Income before income tax (expense) benefit	774	389		249	-580
Income tax (expense) benefit	-271	-136		-87	203
Net income	503	253		162	-377
AOCI related to cash flow hedge relationships | Total reclassifications in the period
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Expense related to derivatives	-301	-455		-71	-95
Income before income tax (expense) benefit	-303	-460		-71	-95
Income tax (expense) benefit	106	144		25	29
Net income	-197	-316		-46	-66
AOCI related to cash flow hedge relationships | Total reclassifications in the period | Freddie Mac parent
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total interest expense	-2	-5		0	0
AOCI related to defined benefit plans | Total reclassifications in the period
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	4	2		1	8
Income tax (expense) benefit	-2	-43		-1	-43
Net income	$2	($41)		$0	($35)

Stockholders_Equity_Senior_Pre

Stockholders' Equity - Senior Preferred Stock (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013	Sep. 30, 2008
Senior Preferred Stock [Line Items]
Increase in liquidation preference	$0	$165,000,000
Aggregate liquidation preference on senior preferred stock	72,336,000,000		72,336,000,000
Cash amount received as a result of issuing the initial liquidation preference				0
Senior Preferred Stock
Senior Preferred Stock [Line Items]
Shares Authorized	1,000,000
Shares Outstanding	1,000,000
Total Par Value	1,000,000
Initial Liquidation Preference Price Per Share	$1,000
Aggregate liquidation preference on senior preferred stock	72,336,000,000
Draw 1 - September 8, 2008
Senior Preferred Stock [Line Items]
Shares Authorized	1,000,000
Shares Outstanding	1,000,000
Total Par Value	1,000,000
Initial Liquidation Preference Price Per Share	$1,000
Increase in liquidation preference	1,000,000,000
Cash amount received as a result of issuing the initial liquidation preference	0
Draw 2 - November 24, 2008
Senior Preferred Stock [Line Items]
Increase in liquidation preference	13,800,000,000
Draw 3 - March 31, 2009
Senior Preferred Stock [Line Items]
Increase in liquidation preference	30,800,000,000
Draw 4 - June 30, 2009
Senior Preferred Stock [Line Items]
Increase in liquidation preference	6,100,000,000
Draw 5 - June 30, 2010
Senior Preferred Stock [Line Items]
Increase in liquidation preference	10,600,000,000
Draw 6 - September 30, 2010
Senior Preferred Stock [Line Items]
Increase in liquidation preference	1,800,000,000
Draw 7 - December 30, 2010
Senior Preferred Stock [Line Items]
Increase in liquidation preference	100,000,000
Draw 8 - March 31, 2011
Senior Preferred Stock [Line Items]
Increase in liquidation preference	500,000,000
Draw 9 - September 30, 2011
Senior Preferred Stock [Line Items]
Increase in liquidation preference	1,479,000,000
Draw 10 - December 30, 2011
Senior Preferred Stock [Line Items]
Increase in liquidation preference	5,992,000,000
Draw 11 - March 30, 2012
Senior Preferred Stock [Line Items]
Increase in liquidation preference	146,000,000
Draw 12 - June 29, 2012
Senior Preferred Stock [Line Items]
Increase in liquidation preference	$19,000,000

Stockholders_Equity_Preferred_

Stockholders' Equity - Preferred Stock (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013
Preferred Stock [Line Items]
Total Outstanding Balance	$14,109,000,000		$14,109,000,000
Preferred Stock
Preferred Stock [Line Items]
Shares Authorized	464,170,000
Shares Outstanding	464,170,000
Total Par Value	464,170,000
Total Outstanding Balance	14,109,000,000
Class 1 - 1996 Variable-rate
Preferred Stock [Line Items]
Shares Authorized	5,000,000
Shares Outstanding	5,000,000
Total Par Value	5,000,000
Redemption Price Per Share	$50
Total Outstanding Balance	250,000,000
OTCQB Symbol	FMCCI
Preferred Stock, Dividend Payment Terms	Dividend rate resets quarterly and is equal to the sum of three-month LIBOR plus 1% divided by 1.377, and is capped at 9.00%.
Percentage added to benchmark rate in dividend rate reset calculation	1.00%
Denominator amount in dividend rate reset calculation	1.377
Class 1 - 1996 Variable-rate | Maximum [Member]
Preferred Stock [Line Items]
Preferred stock, dividend rate	9.00%
Class 2 - 5.81%
Preferred Stock [Line Items]
Preferred stock, dividend rate	5.81%
Shares Authorized	3,000,000
Shares Outstanding	3,000,000
Total Par Value	3,000,000
Redemption Price Per Share	$50
Total Outstanding Balance	150,000,000
Class 3 - 5%
Preferred Stock [Line Items]
Preferred stock, dividend rate	5.00%
Shares Authorized	8,000,000
Shares Outstanding	8,000,000
Total Par Value	8,000,000
Redemption Price Per Share	$50
Total Outstanding Balance	400,000,000
OTCQB Symbol	FMCKK
Class 4 - 1998 Variable-rate
Preferred Stock [Line Items]
Shares Authorized	4,400,000
Shares Outstanding	4,400,000
Total Par Value	4,400,000
Redemption Price Per Share	$50
Total Outstanding Balance	220,000,000
OTCQB Symbol	FMCCG
Preferred Stock, Dividend Payment Terms	Dividend rate resets quarterly and is equal to the sum of three-month LIBOR plus 1% divided by 1.377, and is capped at 7.50%.
Percentage added to benchmark rate in dividend rate reset calculation	1.00%
Denominator amount in dividend rate reset calculation	1.377
Class 4 - 1998 Variable-rate | Maximum [Member]
Preferred Stock [Line Items]
Preferred stock, dividend rate	7.50%
Class 5 - 5.10%
Preferred Stock [Line Items]
Preferred stock, dividend rate	5.10%
Shares Authorized	8,000,000
Shares Outstanding	8,000,000
Total Par Value	8,000,000
Redemption Price Per Share	$50
Total Outstanding Balance	400,000,000
OTCQB Symbol	FMCCH
Class 6 - 5.30%
Preferred Stock [Line Items]
Preferred stock, dividend rate	5.30%
Shares Authorized	4,000,000
Shares Outstanding	4,000,000
Total Par Value	4,000,000
Redemption Price Per Share	$50
Total Outstanding Balance	200,000,000
Class 7 - 5.10%
Preferred Stock [Line Items]
Preferred stock, dividend rate	5.10%
Shares Authorized	3,000,000
Shares Outstanding	3,000,000
Total Par Value	3,000,000
Redemption Price Per Share	$50
Total Outstanding Balance	150,000,000
Class 8 - 5.79%
Preferred Stock [Line Items]
Preferred stock, dividend rate	5.79%
Shares Authorized	5,000,000
Shares Outstanding	5,000,000
Total Par Value	5,000,000
Redemption Price Per Share	$50
Total Outstanding Balance	250,000,000
OTCQB Symbol	FMCCK
Class 9 - 1999 Variable-rate
Preferred Stock [Line Items]
Shares Authorized	5,750,000
Shares Outstanding	5,750,000
Total Par Value	5,750,000
Redemption Price Per Share	$50
Total Outstanding Balance	287,000,000
OTCQB Symbol	FMCCL
Preferred Stock, Dividend Payment Terms	Dividend rate resets on January 1 every five years after January 1, 2005 based on a five-year Constant Maturity Treasury rate, and is capped at 11.00%.
Preferred Stock, Redemption Terms	Optional redemption on December 31, 2004 and on December 31 every five years thereafter.
Preferred stock dividend rate reset period	5 years
Class 9 - 1999 Variable-rate | Maximum [Member]
Preferred Stock [Line Items]
Preferred stock, dividend rate	11.00%
Class 10 - 2001 Variable-rate
Preferred Stock [Line Items]
Shares Authorized	6,500,000
Shares Outstanding	6,500,000
Total Par Value	6,500,000
Redemption Price Per Share	$50
Total Outstanding Balance	325,000,000
OTCQB Symbol	FMCCM
Preferred Stock, Dividend Payment Terms	Dividend rate resets on April 1 every two years after April 1, 2003 based on the two-year Constant Maturity Treasury rate plus 0.10%, and is capped at 11.00%.
Preferred Stock, Redemption Terms	Optional redemption on March 31, 2003 and on March 31 every two years thereafter.
Percentage added to benchmark rate in dividend rate reset calculation	0.10%
Preferred stock dividend rate reset period	2 years
Class 10 - 2001 Variable-rate | Maximum [Member]
Preferred Stock [Line Items]
Preferred stock, dividend rate	11.00%
Class 11 - 2001 Variable-rate
Preferred Stock [Line Items]
Shares Authorized	4,600,000
Shares Outstanding	4,600,000
Total Par Value	4,600,000
Redemption Price Per Share	$50
Total Outstanding Balance	230,000,000
OTCQB Symbol	FMCCN
Preferred Stock, Dividend Payment Terms	Dividend rate resets on April 1 every year based on 12-month LIBOR minus 0.20%, and is capped at 11.00%.
Preferred Stock, Redemption Terms	Optional redemption on March 31, 2003 and on March 31 every year thereafter.
Percentage deducted from benchmark rate in dividend rate reset calculation	0.20%
Class 11 - 2001 Variable-rate | Maximum [Member]
Preferred Stock [Line Items]
Preferred stock, dividend rate	11.00%
Class 12 - 5.81%
Preferred Stock [Line Items]
Preferred stock, dividend rate	5.81%
Shares Authorized	3,450,000
Shares Outstanding	3,450,000
Total Par Value	3,450,000
Redemption Price Per Share	$50
Total Outstanding Balance	173,000,000
OTCQB Symbol	FMCCO
Class 13 - 6%
Preferred Stock [Line Items]
Preferred stock, dividend rate	6.00%
Shares Authorized	3,450,000
Shares Outstanding	3,450,000
Total Par Value	3,450,000
Redemption Price Per Share	$50
Total Outstanding Balance	173,000,000
OTCQB Symbol	FMCCP
Class 14 - 2001 Variable-rate
Preferred Stock [Line Items]
Shares Authorized	4,020,000
Shares Outstanding	4,020,000
Total Par Value	4,020,000
Redemption Price Per Share	$50
Total Outstanding Balance	201,000,000
OTCQB Symbol	FMCCJ
Preferred Stock, Dividend Payment Terms	Dividend rate resets on July 1 every two years after July 1, 2003 based on the two-year Constant Maturity Treasury rate plus 0.20%, and is capped at 11.00%.
Preferred Stock, Redemption Terms	Optional redemption on June 30, 2003 and on June 30 every two years thereafter.
Percentage added to benchmark rate in dividend rate reset calculation	0.20%
Preferred stock dividend rate reset period	2 years
Class 14 - 2001 Variable-rate | Maximum [Member]
Preferred Stock [Line Items]
Preferred stock, dividend rate	11.00%
Class 15 - 5.70%
Preferred Stock [Line Items]
Preferred stock, dividend rate	5.70%
Shares Authorized	6,000,000
Shares Outstanding	6,000,000
Total Par Value	6,000,000
Redemption Price Per Share	$50
Total Outstanding Balance	300,000,000
OTCQB Symbol	FMCKP
Class 16 - 5.81%
Preferred Stock [Line Items]
Preferred stock, dividend rate	5.81%
Shares Authorized	6,000,000
Shares Outstanding	6,000,000
Total Par Value	6,000,000
Redemption Price Per Share	$50
Total Outstanding Balance	300,000,000
Class 17 - 2006 Variable-rate
Preferred Stock [Line Items]
Shares Authorized	15,000,000
Shares Outstanding	15,000,000
Total Par Value	15,000,000
Redemption Price Per Share	$50
Total Outstanding Balance	750,000,000
OTCQB Symbol	FMCCS
Preferred Stock, Dividend Payment Terms	Dividend rate resets quarterly and is equal to the sum of three-month LIBOR plus 0.50% but not less than 4.00%.
Percentage added to benchmark rate in dividend rate reset calculation	0.50%
Class 17 - 2006 Variable-rate | Minimum [Member]
Preferred Stock [Line Items]
Preferred stock, dividend rate	4.00%
Class 18 - 6.42%
Preferred Stock [Line Items]
Preferred stock, dividend rate	6.42%
Shares Authorized	5,000,000
Shares Outstanding	5,000,000
Total Par Value	5,000,000
Redemption Price Per Share	$50
Total Outstanding Balance	250,000,000
OTCQB Symbol	FMCCT
Class 19 - 5.90%
Preferred Stock [Line Items]
Preferred stock, dividend rate	5.90%
Shares Authorized	20,000,000
Shares Outstanding	20,000,000
Total Par Value	20,000,000
Redemption Price Per Share	$25
Total Outstanding Balance	500,000,000
OTCQB Symbol	FMCKO
Class 20 - 5.57%
Preferred Stock [Line Items]
Preferred stock, dividend rate	5.57%
Shares Authorized	44,000,000
Shares Outstanding	44,000,000
Total Par Value	44,000,000
Redemption Price Per Share	$25
Total Outstanding Balance	1,100,000,000
OTCQB Symbol	FMCKM
Class 21 - 5.66%
Preferred Stock [Line Items]
Preferred stock, dividend rate	5.66%
Shares Authorized	20,000,000
Shares Outstanding	20,000,000
Total Par Value	20,000,000
Redemption Price Per Share	$25
Total Outstanding Balance	500,000,000
OTCQB Symbol	FMCKN
Class 22 - 6.02%
Preferred Stock [Line Items]
Preferred stock, dividend rate	6.02%
Shares Authorized	20,000,000
Shares Outstanding	20,000,000
Total Par Value	20,000,000
Redemption Price Per Share	$25
Total Outstanding Balance	500,000,000
OTCQB Symbol	FMCKL
Class 23 - 6.55%
Preferred Stock [Line Items]
Preferred stock, dividend rate	6.55%
Shares Authorized	20,000,000
Shares Outstanding	20,000,000
Total Par Value	20,000,000
Redemption Price Per Share	$25
Total Outstanding Balance	500,000,000
OTCQB Symbol	FMCKI
Class 24 - 2007 Fixed-to-floating rate
Preferred Stock [Line Items]
Preferred stock, dividend rate		8.38%
Shares Authorized	240,000,000
Shares Outstanding	240,000,000
Total Par Value	240,000,000
Redemption Price Per Share	$25
Total Outstanding Balance	$6,000,000,000
OTCQB Symbol	FMCKJ
Preferred Stock, Dividend Payment Terms	Dividend rate is set at an annual fixed rate of 8.375% from December 4, 2007 through December 31, 2012. For the period beginning on or after January 1, 2013, dividend rate resets quarterly and is equal to the higher of: (a) the sum of three-month LIBOR plus 4.16% per annum; or (b) 7.875% per annum.
Preferred Stock, Redemption Terms	Optional redemption on December 31, 2012, and on December 31 every five years thereafter.
Percentage added to benchmark rate in dividend rate reset calculation	4.16%
Class 24 - 2007 Fixed-to-floating rate | Maximum [Member]
Preferred Stock [Line Items]
Preferred stock, dividend rate	7.88%

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
Deferred Tax Assets, Tax Credit Carryforwards, LIHTC	$3,000,000,000
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	433,000,000
Unrecognized Tax Benefits	0
Accrued interest receivable (payable) on Income taxes	$535,000,000	$529,000,000

Income_Taxes_Federal_Income_Ta

Income Taxes - Federal Income Tax (Expense) Benefit (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current Income Tax (Expense) Benefit	($1,028)	($117)	$1,540
Deferred Income Tax (Expense) Benefit	-2,284	23,422	-3
Income Tax (Expense) benefit	($3,312)	$23,305	$1,537

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Statutory to Effective Tax Rate (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Tax Benefit (Expense), at Statutory Corporate Tax Rate	($3,851)	($8,877)	($3,306)
Tax-Exempt Interest	73	101	133
Tax Credits	438	495	536
Valuation Allowance [Abstract]
Current year activities	0	5,156	2,637
Release of valuation allowance	0	26,369	0
Unrecognized tax benefits	0	0	1,205
Other	0	138	45
Valutation Allowance	0	31,663	3,887
Other	28	-77	287
Income Tax (Expense) benefit	($3,312)	$23,305	$1,537
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
Tax-Exempt Interest (Percent)	-0.70%	-0.40%	-1.40%
Tax Credits (Percent)	-4.00%	-2.00%	-5.70%
Valuation Allowance Percent [Abstract]
Current Year Activity (Percent)	0.00%	-20.30%	-27.90%
Release of valuation allowance (percent)	0.00%	-104.00%	0.00%
Unrecognized Tax Benefits (Percent)	0.00%	0.00%	-12.80%
Other (Percent)	0.00%	-0.50%	-0.50%
Valuation Allowance (Percent)	0.00%	-124.80%	-41.20%
Other (Percent)	-0.20%	0.30%	-3.00%
Effective Tax Rate	30.10%	-91.90%	-16.30%

Income_Taxes_Deferred_Tax_Asse

Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Deferred Tax Assets, Gross [Abstract]
Deferred fees	$6,245	$5,035
Basis differences related to derivative instruments	7,059	6,946
Credit related items and allowance for loan losses	2,311	3,648
Basis differences related to assets held for investment	1,902	0
LIHTC and AMT credit carryforwards	3,465	3,997
Net operating loss carryforward	0	3,978
Other items, net	10	40
Total deferred tax assets	20,992	23,644
Deferred Tax Liabilities [Abstract]
Basis differences related to assets held for investment	0	-375
Unrealized gains related to Available-for-Sale Securities	-1,371	-518
Basis differences related to debt	-123	-35
Total deferred tax liabilities	-1,494	-928
Deferred tax assets, net	$19,498	$22,716

Segment_Reporting_Details

Segment Reporting (Details) (USD $)	12 Months Ended
In Billions, unless otherwise specified	Dec. 31, 2014
	numberofreportablesegments
Segment Reporting Information [Line Items]
Number of reportable segments	3
Single-family Guarantee
Segment Reporting Information [Line Items]
Unamortized balance of buy down fees	0.3
Unamortized balance of delivery fees	0.7
Investments
Segment Reporting Information [Line Items]
Unamortized balance of cash premiums and discounts, net	3.5
Unamortized balance of buy up fees	0.4

Segment_Reporting_Summary_of_S

Segment Reporting - Summary of Segment Earnings and Comprehensive Income (Loss) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net income	$7,690	$48,668	$10,982
Comprehensive income (loss)	9,426	51,600	16,039
All Other
Segment Reporting Information [Line Items]
Net income	-13	23,892	788
Comprehensive income (loss)	-41	24,013	788
Operating segments and All Other
Segment Reporting Information [Line Items]
Net income	7,690	48,668	10,982
Comprehensive income (loss)	9,426	51,600	16,039
Single-family Guarantee | Operating segments
Segment Reporting Information [Line Items]
Net income	1,547	5,796	-164
Comprehensive income (loss)	1,537	5,845	-227
Investments | Operating segments
Segment Reporting Information [Line Items]
Net income	4,520	15,930	7,367
Comprehensive income (loss)	6,471	20,287	11,397
Multifamily | Operating segments
Segment Reporting Information [Line Items]
Net income	1,636	3,050	2,991
Comprehensive income (loss)	$1,459	$1,455	$4,081

Segment_Reporting_Segment_Earn

Segment Reporting - Segment Earnings and Reconciliation to GAAP Results (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest Income (Expense), Net	$14,263	$16,468	$17,611
(Provision) benefit for credit losses	-58	2,465	-1,890
Non-interest income (loss)
Management and guarantee income	329	271	201
Net impairment of available-for-sale securities recognized in earnings	-938	-1,510	-2,168
Derivative gains (losses)	-8,291	2,632	-2,448
Gains (losses) on trading securities	-218	-1,598	-1,674
Gains (losses) on mortgage loans	731	-336	1,010
Other non-interest income (loss)	8,274	9,060	996
Non-interest expense
Administrative expenses	-1,881	-1,805	-1,561
Real estate owned operations income (expense)	-196	140	-59
Temporary Payroll Tax Cut Continuation Act of 2011 expense	-775	-533	-108
Other (expense) income	-238	109	-465
Segment Adjustments	0	0	0
Income tax (expense) benefit	-3,312	23,305	1,537
Net income (loss)	7,690	48,668	10,982
Changes in unrealized gains (losses) related to available-for-sale securities	1,584	2,406	4,769
Changes in unrealized gains (losses) related to cash flow hedge relationships	197	316	414
Changes in defined benefit plans	-45	210	-126
Total other comprehensive income (loss), net of taxes	1,736	2,932	5,057
Comprehensive income (loss)	9,426	51,600	16,039
All Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest Income (Expense), Net	0	0	0
(Provision) benefit for credit losses	0	0	0
Non-interest income (loss)
Management and guarantee income	0	0	0
Net impairment of available-for-sale securities recognized in earnings	0	0	0
Derivative gains (losses)	0	0	0
Gains (losses) on trading securities	0	0	0
Gains (losses) on mortgage loans	0	0	0
Other non-interest income (loss)	0	0	0
Non-interest expense
Administrative expenses	0	0	0
Real estate owned operations income (expense)	0	0	0
Temporary Payroll Tax Cut Continuation Act of 2011 expense	0	0	0
Other (expense) income	-18	-37	-50
Segment Adjustments	0	0	0
Income tax (expense) benefit	5	23,929	838
Net income (loss)	-13	23,892	788
Changes in unrealized gains (losses) related to available-for-sale securities	0	0	0
Changes in unrealized gains (losses) related to cash flow hedge relationships	0	0	0
Changes in defined benefit plans	-28	121	0
Total other comprehensive income (loss), net of taxes	-28	121	0
Comprehensive income (loss)	-41	24,013	788
Operating segments and All Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest Income (Expense), Net	3,803	5,031	6,870
(Provision) benefit for credit losses	-927	1,627	-3,045
Non-interest income (loss)
Management and guarantee income	5,426	5,136	4,540
Net impairment of available-for-sale securities recognized in earnings	-140	-989	-1,954
Derivative gains (losses)	-4,816	6,821	1,977
Gains (losses) on trading securities	-218	-1,598	-1,674
Gains (losses) on mortgage loans	731	-336	1,010
Other non-interest income (loss)	9,901	11,417	3,947
Non-interest expense
Administrative expenses	-1,881	-1,805	-1,561
Real estate owned operations income (expense)	-196	140	-59
Temporary Payroll Tax Cut Continuation Act of 2011 expense	-775	-533	-108
Other (expense) income	-238	109	-465
Segment Adjustments	332	343	-33
Income tax (expense) benefit	-3,312	23,305	1,537
Net income (loss)	7,690	48,668	10,982
Changes in unrealized gains (losses) related to available-for-sale securities	1,584	2,406	4,769
Changes in unrealized gains (losses) related to cash flow hedge relationships	197	316	414
Changes in defined benefit plans	-45	210	-126
Total other comprehensive income (loss), net of taxes	1,736	2,932	5,057
Comprehensive income (loss)	9,426	51,600	16,039
Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest Income (Expense), Net	10,460	11,437	10,741
(Provision) benefit for credit losses	869	838	1,155
Non-interest income (loss)
Management and guarantee income	-5,097	-4,865	-4,339
Net impairment of available-for-sale securities recognized in earnings	-798	-521	-214
Derivative gains (losses)	-3,475	-4,189	-4,425
Gains (losses) on trading securities	0	0	0
Gains (losses) on mortgage loans	0	0	0
Other non-interest income (loss)	-1,627	-2,357	-2,951
Non-interest expense
Administrative expenses	0	0	0
Real estate owned operations income (expense)	0	0	0
Temporary Payroll Tax Cut Continuation Act of 2011 expense	0	0	0
Other (expense) income	0	0	0
Segment Adjustments	-332	-343	33
Income tax (expense) benefit	0	0	0
Net income (loss)	0	0	0
Changes in unrealized gains (losses) related to available-for-sale securities	0	0	0
Changes in unrealized gains (losses) related to cash flow hedge relationships	0	0	0
Changes in defined benefit plans	0	0	0
Total other comprehensive income (loss), net of taxes	0	0	0
Comprehensive income (loss)	0	0	0
Reclassifications
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest Income (Expense), Net	9,825	10,400	9,942
(Provision) benefit for credit losses	869	838	1,155
Non-interest income (loss)
Management and guarantee income	-4,794	-4,171	-3,507
Net impairment of available-for-sale securities recognized in earnings	-798	-521	-214
Derivative gains (losses)	-3,475	-4,189	-4,425
Gains (losses) on trading securities	0	0	0
Gains (losses) on mortgage loans	0	0	0
Other non-interest income (loss)	-1,627	-2,357	-2,951
Non-interest expense
Administrative expenses	0	0	0
Real estate owned operations income (expense)	0	0	0
Temporary Payroll Tax Cut Continuation Act of 2011 expense	0	0	0
Other (expense) income	0	0	0
Segment Adjustments	0	0	0
Income tax (expense) benefit	0	0	0
Net income (loss)	0	0	0
Changes in unrealized gains (losses) related to available-for-sale securities	0	0	0
Changes in unrealized gains (losses) related to cash flow hedge relationships	0	0	0
Changes in defined benefit plans	0	0	0
Total other comprehensive income (loss), net of taxes	0	0	0
Comprehensive income (loss)	0	0	0
Segment Adjustments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest Income (Expense), Net	635	1,037	799
(Provision) benefit for credit losses	0	0	0
Non-interest income (loss)
Management and guarantee income	-303	-694	-832
Net impairment of available-for-sale securities recognized in earnings	0	0	0
Derivative gains (losses)	0	0	0
Gains (losses) on trading securities	0	0	0
Gains (losses) on mortgage loans	0	0	0
Other non-interest income (loss)	0	0	0
Non-interest expense
Administrative expenses	0	0	0
Real estate owned operations income (expense)	0	0	0
Temporary Payroll Tax Cut Continuation Act of 2011 expense	0	0	0
Other (expense) income	0	0	0
Segment Adjustments	-332	-343	33
Income tax (expense) benefit	0	0	0
Net income (loss)	0	0	0
Changes in unrealized gains (losses) related to available-for-sale securities	0	0	0
Changes in unrealized gains (losses) related to cash flow hedge relationships	0	0	0
Changes in defined benefit plans	0	0	0
Total other comprehensive income (loss), net of taxes	0	0	0
Comprehensive income (loss)	0	0	0
Single-family Guarantee | Operating segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest Income (Expense), Net	-111	320	-147
(Provision) benefit for credit losses	-982	1,409	-3,168
Non-interest income (loss)
Management and guarantee income	5,172	4,930	4,389
Net impairment of available-for-sale securities recognized in earnings	0	0	0
Derivative gains (losses)	7	-3	0
Gains (losses) on trading securities	0	0	0
Gains (losses) on mortgage loans	-139	0	0
Other non-interest income (loss)	844	1,165	931
Non-interest expense
Administrative expenses	-1,170	-1,025	-890
Real estate owned operations income (expense)	-205	124	-62
Temporary Payroll Tax Cut Continuation Act of 2011 expense	-775	-533	-108
Other (expense) income	-191	-179	-285
Segment Adjustments	-303	-694	-832
Income tax (expense) benefit	-600	282	8
Net income (loss)	1,547	5,796	-164
Changes in unrealized gains (losses) related to available-for-sale securities	0	0	0
Changes in unrealized gains (losses) related to cash flow hedge relationships	0	0	0
Changes in defined benefit plans	-10	49	-63
Total other comprehensive income (loss), net of taxes	-10	49	-63
Comprehensive income (loss)	1,537	5,845	-227
Investments | Operating segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest Income (Expense), Net	2,966	3,525	5,726
(Provision) benefit for credit losses	0	0	0
Non-interest income (loss)
Management and guarantee income	0	0	0
Net impairment of available-for-sale securities recognized in earnings	-140	-974	-1,831
Derivative gains (losses)	-5,158	5,543	1,034
Gains (losses) on trading securities	-276	-1,466	-1,794
Gains (losses) on mortgage loans	0	0	0
Other non-interest income (loss)	8,881	8,902	2,719
Non-interest expense
Administrative expenses	-437	-523	-430
Real estate owned operations income (expense)	0	0	0
Temporary Payroll Tax Cut Continuation Act of 2011 expense	0	0	0
Other (expense) income	-6	349	-1
Segment Adjustments	635	1,037	799
Income tax (expense) benefit	-1,945	-463	1,145
Net income (loss)	4,520	15,930	7,367
Changes in unrealized gains (losses) related to available-for-sale securities	1,759	4,010	3,666
Changes in unrealized gains (losses) related to cash flow hedge relationships	197	316	414
Changes in defined benefit plans	-5	31	-50
Total other comprehensive income (loss), net of taxes	1,951	4,357	4,030
Comprehensive income (loss)	6,471	20,287	11,397
Multifamily | Operating segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest Income (Expense), Net	948	1,186	1,291
(Provision) benefit for credit losses	55	218	123
Non-interest income (loss)
Management and guarantee income	254	206	151
Net impairment of available-for-sale securities recognized in earnings	0	-15	-123
Derivative gains (losses)	335	1,281	943
Gains (losses) on trading securities	58	-132	120
Gains (losses) on mortgage loans	870	-336	1,010
Other non-interest income (loss)	176	1,350	297
Non-interest expense
Administrative expenses	-274	-257	-241
Real estate owned operations income (expense)	9	16	3
Temporary Payroll Tax Cut Continuation Act of 2011 expense	0	0	0
Other (expense) income	-23	-24	-129
Segment Adjustments	0	0	0
Income tax (expense) benefit	-772	-443	-454
Net income (loss)	1,636	3,050	2,991
Changes in unrealized gains (losses) related to available-for-sale securities	-175	-1,604	1,103
Changes in unrealized gains (losses) related to cash flow hedge relationships	0	0	0
Changes in defined benefit plans	-2	9	-13
Total other comprehensive income (loss), net of taxes	-177	-1,595	1,090
Comprehensive income (loss)	$1,459	$1,455	$4,081

Financial_Guarantees_Details

Financial Guarantees (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Guarantor Obligations [Line Items]
Cash advances related to multifamily liquidity guarantees	$0	$0
Mortgage related securities backed by single-family loans
Guarantor Obligations [Line Items]
UPB of Issuances and Guarantees	257,200,000,000	425,600,000,000
Mortgage related securities backed by multifamily mortgage loans | Non-consolidated Freddie Mac securities
Guarantor Obligations [Line Items]
UPB of Issuances and Guarantees	18,500,000,000	23,700,000,000
Single-family long-term standby commitments
Guarantor Obligations [Line Items]
UPB of Issuances and Guarantees	2,600,000,000	9,900,000,000
UPB of Guarantees	16,500,000,000	19,200,000,000
Credit enhanced multifamily housing revenue bonds
Guarantor Obligations [Line Items]
UPB of Guarantees	9,300,000,000	9,100,000,000
Securities backed by HFA bonds
Guarantor Obligations [Line Items]
UPB of Guarantees	$400,000,000	$900,000,000

Financial_Guarantees_Financial

Financial Guarantees - Financial Guarantees (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Guarantor Obligations [Line Items]
Recognized Liability	$1,623	$1,522
Reserve for guarantee losses	126	111	183
Other guarantee commitments
Guarantor Obligations [Line Items]
Maximum Exposure	26,147	29,160
Recognized Liability	772	791
Maximum Remaining Term	39 years	36 years
Derivative Instruments
Guarantor Obligations [Line Items]
Maximum Exposure	21,336	9,856
Recognized Liability	154	239
Maximum Remaining Term	31 years	32 years
Non-consolidated Freddie Mac securities | Payment Guarantee
Guarantor Obligations [Line Items]
Maximum Exposure	87,529	71,809
Recognized Liability	$861	$731
Maximum Remaining Term	39 years	40 years

Concentration_of_Credit_and_Ot2

Concentration of Credit and Other Risks (Details) (USD $)	12 Months Ended			43 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2011	Mar. 31, 2014	Jul. 31, 2014	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2012
				settlement	numberofcorporatefamilies
Concentration Risk [Line Items]
UPB of single-family credit guarantee portfolio	$1,700,000,000,000	$1,700,000,000,000		1,700,000,000,000
(Provision) benefit for credit losses	-58,000,000	2,465,000,000	-1,890,000,000
UPB Of SFCGP Released From Repurchase Obligation	315,100,000,000			315,100,000,000
Percent Of SFCGP Released From Repurchase Obligations	19.00%			19.00%
Securities purchased under agreement to resell	51,903,000,000	62,383,000,000		51,903,000,000
Cash and cash equivalents	10,928,000,000	11,281,000,000	8,513,000,000	10,928,000,000	28,442,000,000
Number of corporate families					18
Non-interest income (loss)	-113,000,000	8,519,000,000	-4,083,000,000
Current LTV ratio greater than 100%
Concentration Risk [Line Items]
Single-Family serious delinquency rate	9.06%	9.94%		9.06%
Current average DSCR for multifamily loans	1.05	0.95
Current LTV ratio greater than 100% | Single-family UPB
Concentration Risk [Line Items]
Concentration risk percentage	6.00%	10.00%
Current LTV ratio greater than 100% | Multifamily UPB
Concentration Risk [Line Items]
Concentration risk percentage	1.00%	2.00%
2005 to 2008 Legacy single-family book
Concentration Risk [Line Items]
Single-Family serious delinquency rate	7.59%	8.77%		7.59%
2005 to 2008 Legacy single-family book | Single-family UPB
Concentration Risk [Line Items]
Concentration risk percentage	13.00%	16.00%
2005 to 2008 Legacy single-family book | Single-family Credit Losses
Concentration Risk [Line Items]
Concentration risk percentage	81.00%	81.00%
Current DSCR less than 1.0
Concentration Risk [Line Items]
Average current LTV ratio for multifamily loans	91.00%	95.00%
Current DSCR less than 1.0 | Multifamily UPB
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	3.00%
Seller/Servicers
Concentration Risk [Line Items]
UPB of loans subject to repurchase requests issued to Single-family Seller/Servicers	700,000,000	2,200,000,000		700,000,000
UPB of loans related to recovered losses from repurchase requests to Single-family Seller/Servicer	2,000,000,000	5,600,000,000
Amount of counterparty agreement	400,000,000
Mortgage loans unpaid principal balance covered by counterparty agreement	27,600,000,000			27,600,000,000
(Provision) benefit for credit losses	300,000,000
2013 to current | Single-family UPB
Concentration Risk [Line Items]
Concentration risk percentage	36.00%
Top Single-family sellers | Single-family loan purchase volume
Concentration Risk [Line Items]
Concentration risk percentage	50.00%
Number of counterparties	10			10
Wells Fargo Bank, N.A. | Single-family loan purchase volume
Concentration Risk [Line Items]
Concentration risk percentage	13.00%
Top Single-family servicers based on loans serviced | Single-family loan serviced
Concentration Risk [Line Items]
Number of counterparties	2			2
Wells Fargo Bank, N.A. | Single-family loan serviced
Concentration Risk [Line Items]
Concentration risk percentage	22.00%
JPMorgan Chase Bank, N.A. | Single-family loan serviced
Concentration Risk [Line Items]
Concentration risk percentage	12.00%
Three largest non-depository specialty servicers | Single-family UPB
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%
Ocwen Financial Corp. | Single-family non-agency mortgage related securities serviced
Concentration Risk [Line Items]
Concentration risk percentage	43.00%
JPMorgan Chase Bank, N.A. | Single-family non-agency mortgage related securities serviced
Concentration Risk [Line Items]
Concentration risk percentage	14.00%
Top Multifamily Seller/Servicers | Multifamily loan purchase volume
Concentration Risk [Line Items]
Concentration risk percentage	84.00%
Number of counterparties	10			10
CBRE Capital Markets, Inc. | Multifamily loan purchase volume
Concentration Risk [Line Items]
Concentration risk percentage	20.00%
Berkadia Commercial Mortgage LLC | Multifamily loan purchase volume
Concentration Risk [Line Items]
Concentration risk percentage	15.00%
Mortgage Insurers
Concentration Risk [Line Items]
Maximum loss limit from mortgage insurers for single-family credit guarantee portfolio	58,900,000,000			58,900,000,000
UPB of single-family credit guarantee portfolio with mortgage insurance coverage	230,700,000,000			230,700,000,000
Cash proceeds received from mortgage insurers	1,100,000,000	2,000,000,000
Receivables outstanding from mortgage Insurers	400,000,000	700,000,000		400,000,000
Receivables outstanding, net of reserves, from mortgage insurers	300,000,000	500,000,000		300,000,000
Amount Of Cumulative Unpaid Deferred Payment Obligation	400,000,000			400,000,000
Mortgage Insurers | S&P equivalent BB- rating
Concentration Risk [Line Items]
Number of counterparties	3			3
Mortgage Insurers | S&P equivalent BBB plus rating
Concentration Risk [Line Items]
Number of counterparties	1			1
Triad
Concentration Risk [Line Items]
Percent of Subsequent Partial Claim Payment Cash		75.00%
Percent of Subsequent Partial Claim Payment Deferred Payment Obligation		25.00%
Percent of partial claim payment previously made in cash		60.00%
PMI
Concentration Risk [Line Items]
Percent of Subsequent Partial Claim Payment Cash						67.00%
Percent of Subsequent Partial Claim Payment Deferred Payment Obligation						33.00%
Percent of partial claim payment previously made in cash						55.00%
RMIC
Concentration Risk [Line Items]
Percent of partial claim payment previously made in cash							60.00%
Percent of claim payment in cash								100.00%
Percent of partial claim payment previously made in deferred payment obligations							40.00%
Counterparties accounted for 10% or more | Multifamily loan purchase volume
Concentration Risk [Line Items]
Number of counterparties	2			2
Counterparties accounted for 10% or more | Multifamily loan serviced
Concentration Risk [Line Items]
Concentration risk percentage	39.00%
Number of counterparties	3			3
Counterparties accounted for 10% or more | Mortgage insurance coverage
Concentration Risk [Line Items]
Concentration risk percentage	80.00%
Number of counterparties	4			4
Counterparties accounted for 10% or more | Bond insurance coverage
Concentration Risk [Line Items]
Concentration risk percentage	92.00%
Number of counterparties	4			4
Bond Insurers
Concentration Risk [Line Items]
Maximum principal exposure - bond insurance	6,800,000,000			6,800,000,000
FGIC
Concentration Risk [Line Items]
Percent of Partial Claim Payment, Cash									17.00%
Ambac
Concentration Risk [Line Items]
Percent of Subsequent Partial Claim Payment Cash								45.00%
Percent of Partial Claim Payment, Cash										25.00%
Cash and Other Investment Counterparties
Concentration Risk [Line Items]
Cash and other non-mortgage investments	71,400,000,000	85,900,000,000		71,400,000,000
S&P short-term credit ratings of A-1 or above
Concentration Risk [Line Items]
Securities purchased under agreement to resell	42,200,000,000			42,200,000,000
S&P short-term credit ratings of A-1 or above | Repurchase agreements
Concentration Risk [Line Items]
Number of counterparties	15			15
S&P short-term credit rating of A-2
Concentration Risk [Line Items]
Securities purchased under agreement to resell	1,200,000,000			1,200,000,000
S&P short-term credit rating of A-2 | Repurchase agreements
Concentration Risk [Line Items]
Number of counterparties	3			3
No third party credit rating
Concentration Risk [Line Items]
Securities purchased under agreement to resell	8,600,000,000			8,600,000,000
No third party credit rating | Repurchase agreements
Concentration Risk [Line Items]
Number of counterparties	4			4
US Treasury
Concentration Risk [Line Items]
Cash and cash equivalents	4,400,000,000			4,400,000,000
Federal Resrve Bank of New York
Concentration Risk [Line Items]
Cash and cash equivalents	15,000,000,000			15,000,000,000
Non-Agency Mortgage-Related Security Issuers
Concentration Risk [Line Items]
Non-interest income (loss)	$6,100,000,000
Number of settlements announced, but not yet approved				3

Concentration_of_Credit_and_Ot3

Concentration of Credit and Other Risks - Concentration of Credit Risk - Single-Family Credit Guarantee Portfolio (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Year Of Origination
Concentration Risk [Line Items]
Serious delinquency rate	1.88%	2.39%
Originated in 2014
Concentration Risk [Line Items]
Serious delinquency rate	0.02%
Originated in 2013
Concentration Risk [Line Items]
Serious delinquency rate	0.06%	0.01%
Originated in 2012
Concentration Risk [Line Items]
Serious delinquency rate	0.09%	0.04%
Originated in 2011
Concentration Risk [Line Items]
Serious delinquency rate	0.26%	0.18%
Originated in 2010
Concentration Risk [Line Items]
Serious delinquency rate	0.46%	0.39%
Originated in 2009
Concentration Risk [Line Items]
Serious delinquency rate	0.92%	0.88%
Subtotal - New single-family book
Concentration Risk [Line Items]
Serious delinquency rate	0.24%	0.24%
HARP and other relief refinance loans
Concentration Risk [Line Items]
Serious delinquency rate	0.75%	0.64%
2005 to 2008 Legacy single-family book
Concentration Risk [Line Items]
Serious delinquency rate	7.59%	8.77%
Pre-2005 Legacy single-family book
Concentration Risk [Line Items]
Serious delinquency rate	3.10%	3.24%
Region
Concentration Risk [Line Items]
Serious delinquency rate	1.88%	2.39%
West
Concentration Risk [Line Items]
Serious delinquency rate	1.23%	1.73%
Northeast
Concentration Risk [Line Items]
Serious delinquency rate	2.81%	3.23%
North Central
Concentration Risk [Line Items]
Serious delinquency rate	1.48%	1.81%
Southeast
Concentration Risk [Line Items]
Serious delinquency rate	2.40%	3.42%
Southwest
Concentration Risk [Line Items]
Serious delinquency rate	1.16%	1.36%
State
Concentration Risk [Line Items]
Serious delinquency rate	1.88%	2.39%
Arizona, California, Florida, and Nevada
Concentration Risk [Line Items]
Serious delinquency rate	1.91%	3.01%
Illinois, Michigan, and Ohio
Concentration Risk [Line Items]
Serious delinquency rate	1.70%	2.11%
New York and New Jersey
Concentration Risk [Line Items]
Serious delinquency rate	4.62%	5.11%
All Other
Concentration Risk [Line Items]
Serious delinquency rate	1.53%	1.85%
Single-family UPB | Year Of Origination
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Single-family UPB | Originated in 2014
Concentration Risk [Line Items]
Concentration risk percentage	12.00%
Single-family UPB | Originated in 2013
Concentration Risk [Line Items]
Concentration risk percentage	16.00%	16.00%
Single-family UPB | Originated in 2012
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	16.00%
Single-family UPB | Originated in 2011
Concentration Risk [Line Items]
Concentration risk percentage	6.00%	8.00%
Single-family UPB | Originated in 2010
Concentration Risk [Line Items]
Concentration risk percentage	6.00%	7.00%
Single-family UPB | Originated in 2009
Concentration Risk [Line Items]
Concentration risk percentage	6.00%	7.00%
Single-family UPB | Subtotal - New single-family book
Concentration Risk [Line Items]
Concentration risk percentage	60.00%	54.00%
Single-family UPB | HARP and other relief refinance loans
Concentration Risk [Line Items]
Concentration risk percentage	20.00%	21.00%
Single-family UPB | 2005 to 2008 Legacy single-family book
Concentration Risk [Line Items]
Concentration risk percentage	13.00%	16.00%
Single-family UPB | Pre-2005 Legacy single-family book
Concentration Risk [Line Items]
Concentration risk percentage	7.00%	9.00%
Single-family UPB | Region
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Single-family UPB | West
Concentration Risk [Line Items]
Concentration risk percentage	29.00%	28.00%
Single-family UPB | Northeast
Concentration Risk [Line Items]
Concentration risk percentage	26.00%	26.00%
Single-family UPB | North Central
Concentration Risk [Line Items]
Concentration risk percentage	17.00%	18.00%
Single-family UPB | Southeast
Concentration Risk [Line Items]
Concentration risk percentage	16.00%	16.00%
Single-family UPB | Southwest
Concentration Risk [Line Items]
Concentration risk percentage	12.00%	12.00%
Single-family UPB | State
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Single-family UPB | Arizona, California, Florida, and Nevada
Concentration Risk [Line Items]
Concentration risk percentage	26.00%	26.00%
Single-family UPB | Illinois, Michigan, and Ohio
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	11.00%
Single-family UPB | New York and New Jersey
Concentration Risk [Line Items]
Concentration risk percentage	9.00%	9.00%
Single-family UPB | All Other
Concentration Risk [Line Items]
Concentration risk percentage	55.00%	54.00%
Single-family Credit Losses | Year Of Origination
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Single-family Credit Losses | Originated in 2014
Concentration Risk [Line Items]
Concentration risk percentage	0.00%
Single-family Credit Losses | Originated in 2013
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%
Single-family Credit Losses | Originated in 2012
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%
Single-family Credit Losses | Originated in 2011
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%
Single-family Credit Losses | Originated in 2010
Concentration Risk [Line Items]
Concentration risk percentage	1.00%	1.00%
Single-family Credit Losses | Originated in 2009
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	2.00%
Single-family Credit Losses | Subtotal - New single-family book
Concentration Risk [Line Items]
Concentration risk percentage	3.00%	3.00%
Single-family Credit Losses | HARP and other relief refinance loans
Concentration Risk [Line Items]
Concentration risk percentage	8.00%	7.00%
Single-family Credit Losses | 2005 to 2008 Legacy single-family book
Concentration Risk [Line Items]
Concentration risk percentage	81.00%	81.00%
Single-family Credit Losses | Pre-2005 Legacy single-family book
Concentration Risk [Line Items]
Concentration risk percentage	8.00%	9.00%
Single-family Credit Losses | Region
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Single-family Credit Losses | West
Concentration Risk [Line Items]
Concentration risk percentage	13.00%	24.00%
Single-family Credit Losses | Northeast
Concentration Risk [Line Items]
Concentration risk percentage	26.00%	15.00%
Single-family Credit Losses | North Central
Concentration Risk [Line Items]
Concentration risk percentage	22.00%	23.00%
Single-family Credit Losses | Southeast
Concentration Risk [Line Items]
Concentration risk percentage	35.00%	35.00%
Single-family Credit Losses | Southwest
Concentration Risk [Line Items]
Concentration risk percentage	4.00%	3.00%
Single-family Credit Losses | State
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Single-family Credit Losses | Arizona, California, Florida, and Nevada
Concentration Risk [Line Items]
Concentration risk percentage	36.00%	47.00%
Single-family Credit Losses | Illinois, Michigan, and Ohio
Concentration Risk [Line Items]
Concentration risk percentage	17.00%	19.00%
Single-family Credit Losses | New York and New Jersey
Concentration Risk [Line Items]
Concentration risk percentage	11.00%	3.00%
Single-family Credit Losses | All Other
Concentration Risk [Line Items]
Concentration risk percentage	36.00%	31.00%

Concentration_of_Credit_and_Ot4

Concentration of Credit and Other Risks - Certain Higher-Risk Categories in the Single-Family Credit Guarantee Portfolio (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Interest-only
Concentration Risk [Line Items]
Serious delinquency rate	9.36%	12.51%
Option ARM
Concentration Risk [Line Items]
Serious delinquency rate	9.87%	12.30%
Alt-A
Concentration Risk [Line Items]
Serious delinquency rate	8.53%	10.06%
Original LTV ratio greater than 90%
Concentration Risk [Line Items]
Serious delinquency rate	2.58%	3.22%
Lower credit scores at origination (less than 620)
Concentration Risk [Line Items]
Serious delinquency rate	8.57%	9.99%
Single-family UPB | Interest-only
Concentration Risk [Line Items]
Percentage of Portfolio	2.00%	2.00%
Single-family UPB | Option ARM
Concentration Risk [Line Items]
Percentage of Portfolio	0.00%	0.00%
Single-family UPB | Alt-A
Concentration Risk [Line Items]
Percentage of Portfolio	3.00%	3.00%
Single-family UPB | Original LTV ratio greater than 90%
Concentration Risk [Line Items]
Percentage of Portfolio	16.00%	16.00%
Single-family UPB | Lower credit scores at origination (less than 620)
Concentration Risk [Line Items]
Percentage of Portfolio	3.00%	3.00%

Concentration_of_Credit_and_Ot5

Concentration of Credit and Other Risks - Concentration of Credit Risk - Multifamily Mortgage Portfolio (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Billions, unless otherwise specified
States
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	$143.30	$132.80
Multifamily Delinquency Rate	0.04%	0.09%
California
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	23.2	22.4
Multifamily Delinquency Rate	0.00%	0.03%
Texas
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	18.3	16.7
Multifamily Delinquency Rate	0.06%	0.02%
New York
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	12.1	11.4
Multifamily Delinquency Rate	0.00%	0.12%
Florida
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	10	9.3
Multifamily Delinquency Rate	0.00%	0.28%
Virginia
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	7.3	7
Multifamily Delinquency Rate	0.00%	0.37%
Maryland
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	7.2	6.7
Multifamily Delinquency Rate	0.00%	0.00%
All other states
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	65.2	59.3
Multifamily Delinquency Rate	0.07%	0.08%
Region
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	143.3	132.8
Multifamily Delinquency Rate	0.04%	0.09%
Northeast
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	39	37.5
Multifamily Delinquency Rate	0.00%	0.10%
West
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	36.3	33.8
Multifamily Delinquency Rate	0.00%	0.07%
Southwest
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	29.1	26.2
Multifamily Delinquency Rate	0.07%	0.05%
Southeast
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	26.7	24.1
Multifamily Delinquency Rate	0.09%	0.16%
North Central
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	12.2	11.2
Multifamily Delinquency Rate	0.06%	0.07%
Original LTV ratio greater than 80 percent
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	6.1	5.6
Multifamily Delinquency Rate	0.04%	0.19%
Original DSCR below one point one
Concentration Risk [Line Items]
Multifamily Mortgage Portfolio UPB	$2.10	$2.20
Multifamily Delinquency Rate	0.00%	0.00%

Fair_Value_Disclosures_Details

Fair Value Disclosures (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value Disclosures [Line Items]
Net transfer in (out) between Level 1 and Level 2 fair value assets	$1,000,000	($27,000,000)
Net transfer in (out) between Level 1 and Level 2 fair value liabilities	1,000,000	-5,000,000
Unpaid Principal Balance Of Loans Where Whole Loan Market Is Principal Market	72,000,000,000	101,200,000,000
Unpaid Principal Balance Of Loans Where GSE Securitization Market Is Principal Market	1,600,000,000,000	1,500,000,000,000
Decrease (Increase) Of Fair Value Of Mortgage Loans Without Benefits Reflected In The Pricing Of HARP Loans	19,100,000,000	18,500,000,000
Total Fair Value Of The HARP Loans Presented In Consolidated Fair Value Balance Sheets	119,800,000,000	145,000,000,000
Multifamily Held-For-Sale Loans with Fair Value Option Elected
Fair Value Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	900,000,000	-300,000,000	1,000,000,000
Debt securities with Fair Value Option Elected
Fair Value Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$144,000,000	($37,000,000)	$16,000,000

Fair_Value_Disclosures_Assets_

Fair Value Disclosures - Assets and Liabilities on Our Consolidated Balance Sheets Measured at Fair Value on a Recurring Basis (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Mortgage Loans [Abstract]
Mortgage loans, held for sale, at fair value	$12,130,000,000	$8,727,000,000
Derivative Assets Net [Abstract]
Derivative Assets	822,000,000	1,063,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	1,963,000,000	180,000,000
Net Cash Pledged As Collateral	3,200,000,000	871,000,000
Net interest receivable (payable) of derivative assets/liabilities	-700,000,000	-600,000,000
Held by consolidated trusts
Liabilities, Fair Value Disclosure [Abstract]
Debt securities recorded at fair value	42,000,000	59,000,000
Freddie Mac parent
Liabilities, Fair Value Disclosure [Abstract]
Debt securities recorded at fair value	5,820,000,000	2,683,000,000
Fair Value, Measurements, Recurring [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	106,550,000,000	128,919,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	30,437,000,000	23,404,000,000
Total investments in securities	136,987,000,000	152,323,000,000
Mortgage Loans [Abstract]
Mortgage loans, held for sale, at fair value	12,130,000,000	8,727,000,000
Derivative Assets Net [Abstract]
Derivative Assets	822,000,000	1,063,000,000
Other Assets [Abstract]
Guarantee Assets	1,626,000,000	1,611,000,000
All other, at fair value	5,000,000	9,000,000
Total other assets	1,631,000,000	1,620,000,000
Total Assets at Fair value	151,570,000,000	163,733,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	1,963,000,000	180,000,000
Total liabilities carried at fair value on a recurring basis	7,825,000,000	2,922,000,000
Fair Value, Measurements, Recurring [Member] | Held by consolidated trusts
Liabilities, Fair Value Disclosure [Abstract]
Debt securities recorded at fair value	42,000,000	59,000,000
Fair Value, Measurements, Recurring [Member] | Freddie Mac parent
Liabilities, Fair Value Disclosure [Abstract]
Debt securities recorded at fair value	5,820,000,000	2,683,000,000
Fair Value, Measurements, Recurring [Member] | Total Derivatives Before Netting Adjustments [Member]
Derivative Assets Net [Abstract]
Derivative Assets	9,944,000,000	14,231,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	13,560,000,000	13,627,000,000
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Derivative Assets Net [Abstract]
Derivative Assets	5,653,000,000	10,019,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	13,316,000,000	13,317,000,000
Fair Value, Measurements, Recurring [Member] | Option-Based Derivatives [Member]
Derivative Assets Net [Abstract]
Derivative Assets	4,224,000,000	4,112,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	127,000,000	204,000,000
Fair Value, Measurements, Recurring [Member] | Other Derivative [Member]
Derivative Assets Net [Abstract]
Derivative Assets	67,000,000	100,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	117,000,000	106,000,000
Fair Value, Measurements, Recurring [Member] | Mortage-related securities
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	106,550,000,000	128,919,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	23,755,000,000	16,768,000,000
Total investments in securities	130,305,000,000	145,687,000,000
Fair Value, Measurements, Recurring [Member] | Freddie Mac
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	39,099,000,000	40,659,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	17,469,000,000	9,349,000,000
Fair Value, Measurements, Recurring [Member] | Fannie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	11,313,000,000	10,797,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	6,099,000,000	7,180,000,000
Fair Value, Measurements, Recurring [Member] | Ginnie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	199,000,000	167,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	16,000,000	98,000,000
Fair Value, Measurements, Recurring [Member] | CMBS
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	21,822,000,000	30,338,000,000
Fair Value, Measurements, Recurring [Member] | Subprime
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	20,589,000,000	27,499,000,000
Fair Value, Measurements, Recurring [Member] | Option ARM
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	5,649,000,000	6,574,000,000
Fair Value, Measurements, Recurring [Member] | Alt-A and other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	5,043,000,000	8,706,000,000
Fair Value, Measurements, Recurring [Member] | Obligations of states and political subdivisions
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	2,198,000,000	3,495,000,000
Fair Value, Measurements, Recurring [Member] | Manufactured housing
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	638,000,000	684,000,000
Fair Value, Measurements, Recurring [Member] | Other
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	171,000,000	141,000,000
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	6,682,000,000	6,636,000,000
Fair Value, Measurements, Recurring [Member] | Netting [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Total investments in securities	0	0
Mortgage Loans [Abstract]
Mortgage loans, held for sale, at fair value	0	0
Derivative Assets Net [Abstract]
Derivative Assets	-9,122,000,000	-13,168,000,000
Other Assets [Abstract]
Guarantee Assets	0	0
All other, at fair value	0	0
Total other assets	0	0
Total Assets at Fair value	-9,122,000,000	-13,168,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	-11,597,000,000	-13,447,000,000
Total liabilities carried at fair value on a recurring basis	-11,597,000,000	-13,447,000,000
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Held by consolidated trusts
Liabilities, Fair Value Disclosure [Abstract]
Debt securities recorded at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Freddie Mac parent
Liabilities, Fair Value Disclosure [Abstract]
Debt securities recorded at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Total Derivatives Before Netting Adjustments [Member]
Derivative Assets Net [Abstract]
Derivative Assets	0	0
Derivative Liabilities Net [Abstract]
Derivative Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Interest Rate Swap [Member]
Derivative Assets Net [Abstract]
Derivative Assets	0	0
Derivative Liabilities Net [Abstract]
Derivative Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Option-Based Derivatives [Member]
Derivative Assets Net [Abstract]
Derivative Assets	0	0
Derivative Liabilities Net [Abstract]
Derivative Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Other Derivative [Member]
Derivative Assets Net [Abstract]
Derivative Assets	0	0
Derivative Liabilities Net [Abstract]
Derivative Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Mortage-related securities
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Freddie Mac
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Fannie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Ginnie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | CMBS
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Subprime
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Option ARM
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Alt-A and other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Obligations of states and political subdivisions
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Manufactured housing
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | Other
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Netting [Member] | US Treasury Securities [Member]
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	6,682,000,000	6,636,000,000
Total investments in securities	6,682,000,000	6,636,000,000
Mortgage Loans [Abstract]
Mortgage loans, held for sale, at fair value	0	0
Derivative Assets Net [Abstract]
Derivative Assets	5,000,000	0
Other Assets [Abstract]
Guarantee Assets	0	0
All other, at fair value	0	0
Total other assets	0	0
Total Assets at Fair value	6,687,000,000	6,636,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	28,000,000	0
Total liabilities carried at fair value on a recurring basis	28,000,000	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Held by consolidated trusts
Liabilities, Fair Value Disclosure [Abstract]
Debt securities recorded at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Freddie Mac parent
Liabilities, Fair Value Disclosure [Abstract]
Debt securities recorded at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Total Derivatives Before Netting Adjustments [Member]
Derivative Assets Net [Abstract]
Derivative Assets	5,000,000	0
Derivative Liabilities Net [Abstract]
Derivative Liabilities	28,000,000	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Derivative Assets Net [Abstract]
Derivative Assets	0	0
Derivative Liabilities Net [Abstract]
Derivative Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Option-Based Derivatives [Member]
Derivative Assets Net [Abstract]
Derivative Assets	5,000,000	0
Derivative Liabilities Net [Abstract]
Derivative Liabilities	28,000,000	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other Derivative [Member]
Derivative Assets Net [Abstract]
Derivative Assets	0	0
Derivative Liabilities Net [Abstract]
Derivative Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Mortage-related securities
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Freddie Mac
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Fannie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Ginnie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | CMBS
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Subprime
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Option ARM
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Alt-A and other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Obligations of states and political subdivisions
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Manufactured housing
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Other
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	6,682,000,000	6,636,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Netting [Member]
Derivative Assets Net [Abstract]
Derivative Assets	0	0
Derivative Liabilities Net [Abstract]
Derivative Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	64,655,000,000	76,770,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	22,591,000,000	16,122,000,000
Total investments in securities	87,246,000,000	92,892,000,000
Mortgage Loans [Abstract]
Mortgage loans, held for sale, at fair value	12,130,000,000	8,727,000,000
Derivative Assets Net [Abstract]
Derivative Assets	9,912,000,000	14,220,000,000
Other Assets [Abstract]
Guarantee Assets	0	0
All other, at fair value	0	0
Total other assets	0	0
Total Assets at Fair value	109,288,000,000	115,839,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	13,495,000,000	13,291,000,000
Total liabilities carried at fair value on a recurring basis	19,357,000,000	14,505,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Held by consolidated trusts
Liabilities, Fair Value Disclosure [Abstract]
Debt securities recorded at fair value	42,000,000	59,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Freddie Mac parent
Liabilities, Fair Value Disclosure [Abstract]
Debt securities recorded at fair value	5,820,000,000	1,155,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Total Derivatives Before Netting Adjustments [Member]
Derivative Assets Net [Abstract]
Derivative Assets	9,912,000,000	14,220,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	13,495,000,000	13,291,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Derivative Assets Net [Abstract]
Derivative Assets	5,653,000,000	10,009,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	13,316,000,000	13,022,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Option-Based Derivatives [Member]
Derivative Assets Net [Abstract]
Derivative Assets	4,219,000,000	4,112,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	99,000,000	201,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other Derivative [Member]
Derivative Assets Net [Abstract]
Derivative Assets	40,000,000	99,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	80,000,000	68,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortage-related securities
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	22,591,000,000	16,122,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Freddie Mac
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	34,868,000,000	38,720,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	16,542,000,000	9,006,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Fannie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	11,228,000,000	10,666,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	5,867,000,000	6,959,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Ginnie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	195,000,000	155,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	15,000,000	24,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | CMBS
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	18,348,000,000	27,229,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Subprime
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Option ARM
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Alt-A and other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	16,000,000	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Obligations of states and political subdivisions
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Manufactured housing
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Other
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	167,000,000	133,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Netting [Member]
Derivative Assets Net [Abstract]
Derivative Assets	0	0
Derivative Liabilities Net [Abstract]
Derivative Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	41,895,000,000	52,149,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	1,164,000,000	646,000,000
Total investments in securities	43,059,000,000	52,795,000,000
Mortgage Loans [Abstract]
Mortgage loans, held for sale, at fair value	0	0
Derivative Assets Net [Abstract]
Derivative Assets	27,000,000	11,000,000
Other Assets [Abstract]
Guarantee Assets	1,626,000,000	1,611,000,000
All other, at fair value	5,000,000	9,000,000
Total other assets	1,631,000,000	1,620,000,000
Total Assets at Fair value	44,717,000,000	54,426,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	37,000,000	336,000,000
Total liabilities carried at fair value on a recurring basis	37,000,000	1,864,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Held by consolidated trusts
Liabilities, Fair Value Disclosure [Abstract]
Debt securities recorded at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Freddie Mac parent
Liabilities, Fair Value Disclosure [Abstract]
Debt securities recorded at fair value	0	1,528,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Total Derivatives Before Netting Adjustments [Member]
Derivative Assets Net [Abstract]
Derivative Assets	27,000,000	11,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	37,000,000	336,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Derivative Assets Net [Abstract]
Derivative Assets	0	10,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	0	295,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Option-Based Derivatives [Member]
Derivative Assets Net [Abstract]
Derivative Assets	0	0
Derivative Liabilities Net [Abstract]
Derivative Liabilities	0	3,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Derivative [Member]
Derivative Assets Net [Abstract]
Derivative Assets	27,000,000	1,000,000
Derivative Liabilities Net [Abstract]
Derivative Liabilities	37,000,000	38,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortage-related securities
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	41,895,000,000	52,149,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	1,164,000,000	646,000,000
Total investments in securities	43,059,000,000	52,795,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Freddie Mac
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	4,231,000,000	1,939,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	927,000,000	343,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Fannie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	85,000,000	131,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	232,000,000	221,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Ginnie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	4,000,000	12,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	1,000,000	74,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | CMBS
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	3,474,000,000	3,109,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Subprime
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	20,589,000,000	27,499,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Option ARM
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	5,649,000,000	6,574,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Alt-A and other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	5,027,000,000	8,706,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Obligations of states and political subdivisions
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	2,198,000,000	3,495,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Manufactured housing
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	638,000,000	684,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	4,000,000	8,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Netting [Member]
Derivative Assets Net [Abstract]
Derivative Assets	0	0
Derivative Liabilities Net [Abstract]
Derivative Liabilities	$0	$0

Fair_Value_Disclosures_Assets_1

Fair Value Disclosures - Assets and Liabilities on Our Consolidated Balance Sheets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Other Debt, At Fair Value [Member]
Liabilities:
Begining Balance	$1,528	$2,187
Included in Earnings	-7	11
Included in Other Comprehensive Income	0	0
Total realized and unrealized (gains) losses	-7	11
Purchases	0	0
Issues	0	1,130
Sales	0	0
Settlements, Net	-1,521	-670
Transfers into Level 3	0	0
Transfers out of Level 3	0	-1,130
Ending Balance	0	1,528
Unrealized Gains (Losses) Still Held:
Unrealized (Gains) Losses Still Held - Liabilities	0	4
Net Derivatives [Member]
Liabilities:
Begining Balance	325	47
Included in Earnings	-94	301
Included in Other Comprehensive Income	0	0
Total realized and unrealized (gains) losses	-94	301
Purchases	0	0
Issues	0	12
Sales	0	0
Settlements, Net	60	-35
Transfers into Level 3	0	0
Transfers out of Level 3	-281	0
Ending Balance	10	325
Unrealized Gains (Losses) Still Held:
Unrealized (Gains) Losses Still Held - Liabilities	-30	274
Available-For-Sale Mortgage-Related Securities [Member]
Assets:
Beginning Balance	52,149	54,995
Included in Earnings	-481	-1,429
Included in Other Comprehensive Income	3,733	9,397
Total realized and unrealized gains (losses)	3,252	7,968
Purchases	5,791	229
Issues	0	0
Sales	-15,344	-3,134
Settlements, net	-3,894	-7,934
Transfers into Level 3	49	25
Transfers out of Level 3	-108	0
Ending Balance	41,895	52,149
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	-938	-1,496
Available-For-Sale Mortgage-Related Securities [Member] | Freddie Mac
Assets:
Beginning Balance	1,939	1,802
Included in Earnings	2	2
Included in Other Comprehensive Income	71	109
Total realized and unrealized gains (losses)	73	111
Purchases	5,742	239
Issues	0	0
Sales	-3,346	-86
Settlements, net	-138	-152
Transfers into Level 3	3	25
Transfers out of Level 3	-42	0
Ending Balance	4,231	1,939
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	0	0
Available-For-Sale Mortgage-Related Securities [Member] | Fannie Mae
Assets:
Beginning Balance	131	163
Included in Earnings	0	0
Included in Other Comprehensive Income	-2	-3
Total realized and unrealized gains (losses)	-2	-3
Purchases	48	0
Issues	0	0
Sales	-59	0
Settlements, net	-29	-29
Transfers into Level 3	45	0
Transfers out of Level 3	-49	0
Ending Balance	85	131
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	0	0
Available-For-Sale Mortgage-Related Securities [Member] | Ginnie Mae
Assets:
Beginning Balance	12	16
Included in Earnings	0	0
Included in Other Comprehensive Income	0	0
Total realized and unrealized gains (losses)	0	0
Purchases	0	0
Issues	0	0
Sales	-6	0
Settlements, net	-3	-4
Transfers into Level 3	1	0
Transfers out of Level 3	0	0
Ending Balance	4	12
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	0	0
Available-For-Sale Mortgage-Related Securities [Member] | CMBS
Assets:
Beginning Balance	3,109	3,429
Included in Earnings	0	6
Included in Other Comprehensive Income	397	-266
Total realized and unrealized gains (losses)	397	-260
Purchases	0	0
Issues	0	0
Sales	-1	-36
Settlements, net	-31	-24
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	3,474	3,109
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	0	0
Available-For-Sale Mortgage-Related Securities [Member] | Subprime
Assets:
Beginning Balance	27,499	26,457
Included in Earnings	-524	-1,260
Included in Other Comprehensive Income	2,778	6,648
Total realized and unrealized gains (losses)	2,254	5,388
Purchases	0	0
Issues	0	0
Sales	-7,469	-403
Settlements, net	-1,695	-3,943
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	20,589	27,499
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	-794	-1,258
Available-For-Sale Mortgage-Related Securities [Member] | Option ARM
Assets:
Beginning Balance	6,574	5,717
Included in Earnings	-71	-61
Included in Other Comprehensive Income	232	1,694
Total realized and unrealized gains (losses)	161	1,633
Purchases	0	0
Issues	0	0
Sales	-791	-75
Settlements, net	-295	-701
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	5,649	6,574
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	-102	-58
Available-For-Sale Mortgage-Related Securities [Member] | Alt-A and other
Assets:
Beginning Balance	8,706	10,904
Included in Earnings	111	-128
Included in Other Comprehensive Income	158	1,341
Total realized and unrealized gains (losses)	269	1,213
Purchases	0	0
Issues	0	0
Sales	-3,659	-2,001
Settlements, net	-272	-1,410
Transfers into Level 3	0	0
Transfers out of Level 3	-17	0
Ending Balance	5,027	8,706
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	-42	-179
Available-For-Sale Mortgage-Related Securities [Member] | Obligations of states and political subdivisions
Assets:
Beginning Balance	3,495	5,798
Included in Earnings	1	13
Included in Other Comprehensive Income	71	-188
Total realized and unrealized gains (losses)	72	-175
Purchases	1	-10
Issues	0	0
Sales	-13	-533
Settlements, net	-1,357	-1,585
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	2,198	3,495
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	0	0
Available-For-Sale Mortgage-Related Securities [Member] | Manufactured housing
Assets:
Beginning Balance	684	709
Included in Earnings	0	-1
Included in Other Comprehensive Income	28	62
Total realized and unrealized gains (losses)	28	61
Purchases	0	0
Issues	0	0
Sales	0	0
Settlements, net	-74	-86
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	638	684
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	0	-1
Trading Mortgage Related Securities [Member]
Assets:
Beginning Balance	646	1,590
Included in Earnings	-38	-93
Included in Other Comprehensive Income	0	0
Total realized and unrealized gains (losses)	-38	-93
Purchases	2,362	1,276
Issues	95	269
Sales	-1,760	-1,478
Settlements, net	-64	-107
Transfers into Level 3	21	44
Transfers out of Level 3	-98	-855
Ending Balance	1,164	646
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	-37	-96
Trading Mortgage Related Securities [Member] | Freddie Mac
Assets:
Beginning Balance	343	1,165
Included in Earnings	8	-50
Included in Other Comprehensive Income	0	0
Total realized and unrealized gains (losses)	8	-50
Purchases	2,282	1,271
Issues	95	269
Sales	-1,690	-1,476
Settlements, net	-43	-64
Transfers into Level 3	0	1
Transfers out of Level 3	-68	-773
Ending Balance	927	343
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	11	-53
Trading Mortgage Related Securities [Member] | Fannie Mae
Assets:
Beginning Balance	221	312
Included in Earnings	-45	-42
Included in Other Comprehensive Income	0	0
Total realized and unrealized gains (losses)	-45	-42
Purchases	79	2
Issues	0	0
Sales	0	-2
Settlements, net	-14	-25
Transfers into Level 3	21	43
Transfers out of Level 3	-30	-67
Ending Balance	232	221
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	-45	-42
Trading Mortgage Related Securities [Member] | Ginnie Mae
Assets:
Beginning Balance	74	92
Included in Earnings	0	-1
Included in Other Comprehensive Income	0	0
Total realized and unrealized gains (losses)	0	-1
Purchases	1	3
Issues	0	0
Sales	-70	0
Settlements, net	-4	-15
Transfers into Level 3	0	0
Transfers out of Level 3	0	-5
Ending Balance	1	74
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	-2	-1
Trading Mortgage Related Securities [Member] | Other
Assets:
Beginning Balance	8	21
Included in Earnings	-1	0
Included in Other Comprehensive Income	0	0
Total realized and unrealized gains (losses)	-1	0
Purchases	0	0
Issues	0	0
Sales	0	0
Settlements, net	-3	-3
Transfers into Level 3	0	0
Transfers out of Level 3	0	-10
Ending Balance	4	8
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	-1	0
Loans Receivable [Member]
Assets:
Beginning Balance		14,238
Included in Earnings		0
Included in Other Comprehensive Income		0
Total realized and unrealized gains (losses)		0
Purchases		0
Issues		0
Sales		0
Settlements, net		0
Transfers into Level 3		0
Transfers out of Level 3		-14,238
Ending Balance		0
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets		0
Other Asset [Member]
Assets:
Beginning Balance	1,620	1,143
Included in Earnings	-188	34
Included in Other Comprehensive Income	0	0
Total realized and unrealized gains (losses)	-188	34
Purchases	0	0
Issues	427	688
Sales	0	-135
Settlements, net	-228	-110
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	1,631	1,620
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	-267	11
Guarantee Asset [Member]
Assets:
Beginning Balance	1,611	1,029
Included in Earnings	-184	4
Included in Other Comprehensive Income	0	0
Total realized and unrealized gains (losses)	-184	4
Purchases	0	0
Issues	427	688
Sales	0	0
Settlements, net	-228	-110
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	1,626	1,611
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	-263	4
All Other Assets [Member]
Assets:
Beginning Balance	9	114
Included in Earnings	-4	30
Included in Other Comprehensive Income	0	0
Total realized and unrealized gains (losses)	-4	30
Purchases	0	0
Issues	0	0
Sales	0	-135
Settlements, net	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending Balance	5	9
Unrealized Gains (Losses) Still Held:
Unrealized Gains (Losses) Still Held - Assets	($4)	$7

Fair_Value_Disclosures_Assets_2

Fair Value Disclosures - Assets on Our Consolidated Balance Sheets Measured at Fair Value on a Non-Recurring Basis (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
Assets, Fair Value Disclosure [Abstract]
Mortgage loans	$9,042,000,000	$515,000,000
REO, net	1,665,000,000	1,837,000,000
Total Assets at Fair value	10,707,000,000	2,352,000,000
Carrying Amount Of REO Written Down To Fair Value	1,600,000,000	1,700,000,000
Estimated Cost To Sell	109,000,000	118,000,000
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Mortgage loans	0	0
REO, net	0	0
Total Assets at Fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Mortgage loans	80,000,000	0
REO, net	0	0
Total Assets at Fair value	80,000,000	0
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Mortgage loans	8,962,000,000	515,000,000
REO, net	1,665,000,000	1,837,000,000
Total Assets at Fair value	$10,627,000,000	$2,352,000,000

Fair_Value_Disclosures_Quantit

Fair Value Disclosures - Quantitative Information about Recurring Level 3 Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	106,550,000,000	128,919,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	30,437,000,000	23,404,000,000
Investments, Fair Value Disclosure	136,987,000,000	152,323,000,000
Other assets:
Guarantee Assets Fair Value Disclosure	1,626,000,000	1,611,000,000
All Other Assets Fair Value Disclosure	5,000,000	9,000,000
Total other assets	1,631,000,000	1,620,000,000
Liabilities [Abstract]
Net Derivative Liability (Asset)	1,141,000,000	-883,000,000
Other Debt, At Fair Value [Member]
Liabilities [Abstract]
Other debt at fair value		2,683,000,000
Mortgage-related securities
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	106,550,000,000	128,919,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	23,755,000,000	16,768,000,000
Investments, Fair Value Disclosure	130,305,000,000	145,687,000,000
Freddie Mac
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	39,099,000,000	40,659,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	17,469,000,000	9,349,000,000
Fannie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	11,313,000,000	10,797,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	6,099,000,000	7,180,000,000
Ginnie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	199,000,000	167,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	16,000,000	98,000,000
CMBS
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	21,822,000,000	30,338,000,000
Subprime
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	20,589,000,000	27,499,000,000
Option ARM
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	5,649,000,000	6,574,000,000
Alt-A and other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	5,043,000,000	8,706,000,000
Obligations of states and political subdivisions
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	2,198,000,000	3,495,000,000
Manufactured housing
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	638,000,000	684,000,000
Other
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	171,000,000	141,000,000
Fair Value, Inputs, Level 3 [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	41,895,000,000	52,149,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	1,164,000,000	646,000,000
Investments, Fair Value Disclosure	43,059,000,000	52,795,000,000
Other assets:
Guarantee Assets Fair Value Disclosure	1,626,000,000	1,611,000,000
All Other Assets Fair Value Disclosure	5,000,000	9,000,000
Total other assets	1,631,000,000	1,620,000,000
Fair Value, Inputs, Level 3 [Member] | Other Debt, At Fair Value [Member]
Liabilities [Abstract]
Other debt at fair value		1,528,000,000
Fair Value, Inputs, Level 3 [Member] | Other Debt, At Fair Value [Member] | Median of External Sources [Member]
Liabilities [Abstract]
Other debt at fair value		528,000,000
Fair Value, Inputs, Level 3 [Member] | Other Debt, At Fair Value [Member] | Single External Source [Member]
Liabilities [Abstract]
Other debt at fair value		1,000,000,000
Fair Value, Inputs, Level 3 [Member] | Other Debt, At Fair Value [Member] | Weighted Average [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		100
Fair Value, Inputs, Level 3 [Member] | Other Debt, At Fair Value [Member] | Weighted Average [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		100
Fair Value, Inputs, Level 3 [Member] | Other Debt, At Fair Value [Member] | Minimum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		100
Fair Value, Inputs, Level 3 [Member] | Other Debt, At Fair Value [Member] | Minimum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		100
Fair Value, Inputs, Level 3 [Member] | Other Debt, At Fair Value [Member] | Maximum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		100.1
Fair Value, Inputs, Level 3 [Member] | Other Debt, At Fair Value [Member] | Maximum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		100
Fair Value, Inputs, Level 3 [Member] | Net Derivatives [Member]
Liabilities [Abstract]
Net Derivative Liability (Asset)	10,000,000	325,000,000
Fair Value, Inputs, Level 3 [Member] | Net Derivatives [Member] | Single External Source [Member]
Liabilities [Abstract]
Net Derivative Liability (Asset)		283,000,000
Fair Value, Inputs, Level 3 [Member] | Net Derivatives [Member] | Discounted Cash Flows [Member]
Liabilities [Abstract]
Net Derivative Liability (Asset)		37,000,000
Fair Value, Inputs, Level 3 [Member] | Net Derivatives [Member] | Other
Liabilities [Abstract]
Net Derivative Liability (Asset)	10,000,000	5,000,000
Fair Value, Inputs, Level 3 [Member] | Net Derivatives [Member] | Weighted Average [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		0.8
Fair Value, Inputs, Level 3 [Member] | Net Derivatives [Member] | Minimum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		0.8
Fair Value, Inputs, Level 3 [Member] | Net Derivatives [Member] | Maximum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		0.8
Fair Value, Inputs, Level 3 [Member] | Mortgage-related securities
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	41,895,000,000	52,149,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	1,164,000,000	646,000,000
Investments, Fair Value Disclosure	43,059,000,000	52,795,000,000
Fair Value, Inputs, Level 3 [Member] | Freddie Mac
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	4,231,000,000	1,939,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	927,000,000	343,000,000
Fair Value, Inputs, Level 3 [Member] | Freddie Mac | Risk Metric [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	375,000,000	1,547,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	320,000,000
Fair Value, Inputs, Level 3 [Member] | Freddie Mac | Median of External Sources [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	143,000,000
Fair Value, Inputs, Level 3 [Member] | Freddie Mac | Single External Source [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure		133,000,000
Fair Value, Inputs, Level 3 [Member] | Freddie Mac | Discounted Cash Flows [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	2,980,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	478,000,000	297,000,000
Fair Value, Inputs, Level 3 [Member] | Freddie Mac | Other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	733,000,000	259,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	129,000,000	46,000,000
Fair Value, Inputs, Level 3 [Member] | Fannie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	85,000,000	131,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	232,000,000	221,000,000
Fair Value, Inputs, Level 3 [Member] | Fannie Mae | Median of External Sources [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	47,000,000	26,000,000
Fair Value, Inputs, Level 3 [Member] | Fannie Mae | Single External Source [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure		91,000,000
Fair Value, Inputs, Level 3 [Member] | Fannie Mae | Discounted Cash Flows [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	29,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	207,000,000	191,000,000
Fair Value, Inputs, Level 3 [Member] | Fannie Mae | Other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	9,000,000	14,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	25,000,000	30,000,000
Fair Value, Inputs, Level 3 [Member] | Ginnie Mae
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	4,000,000	12,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	1,000,000	74,000,000
Fair Value, Inputs, Level 3 [Member] | Ginnie Mae | Median of External Sources [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure		6,000,000
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure		74,000,000
Fair Value, Inputs, Level 3 [Member] | Ginnie Mae | Discounted Cash Flows [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	4,000,000	6,000,000
Fair Value, Inputs, Level 3 [Member] | CMBS
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	3,474,000,000	3,109,000,000
Fair Value, Inputs, Level 3 [Member] | CMBS | Risk Metric [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	2,726,000,000
Fair Value, Inputs, Level 3 [Member] | CMBS | Single External Source [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure		2,942,000,000
Fair Value, Inputs, Level 3 [Member] | CMBS | Discounted Cash Flows [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	748,000,000
Fair Value, Inputs, Level 3 [Member] | CMBS | Other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure		167,000,000
Fair Value, Inputs, Level 3 [Member] | Subprime
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	20,589,000,000	27,499,000,000
Fair Value, Inputs, Level 3 [Member] | Subprime | Median of External Sources [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	18,789,000,000	25,367,000,000
Fair Value, Inputs, Level 3 [Member] | Subprime | Other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	1,800,000,000	2,132,000,000
Fair Value, Inputs, Level 3 [Member] | Option ARM
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	5,649,000,000	6,574,000,000
Fair Value, Inputs, Level 3 [Member] | Option ARM | Median of External Sources [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	5,205,000,000	4,995,000,000
Fair Value, Inputs, Level 3 [Member] | Option ARM | Discounted Cash Flows [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure		705,000,000
Fair Value, Inputs, Level 3 [Member] | Option ARM | Other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	444,000,000	874,000,000
Fair Value, Inputs, Level 3 [Member] | Alt-A and other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	5,027,000,000	8,706,000,000
Fair Value, Inputs, Level 3 [Member] | Alt-A and other | Median of External Sources [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	4,116,000,000	3,503,000,000
Fair Value, Inputs, Level 3 [Member] | Alt-A and other | Single External Source [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure		4,028,000,000
Fair Value, Inputs, Level 3 [Member] | Alt-A and other | Other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	911,000,000	1,175,000,000
Fair Value, Inputs, Level 3 [Member] | Obligations of states and political subdivisions
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	2,198,000,000	3,495,000,000
Fair Value, Inputs, Level 3 [Member] | Obligations of states and political subdivisions | Median of External Sources [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	1,992,000,000	3,067,000,000
Fair Value, Inputs, Level 3 [Member] | Obligations of states and political subdivisions | Other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	206,000,000	428,000,000
Fair Value, Inputs, Level 3 [Member] | Manufactured housing
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	638,000,000	684,000,000
Fair Value, Inputs, Level 3 [Member] | Manufactured housing | Median of External Sources [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	515,000,000	577,000,000
Fair Value, Inputs, Level 3 [Member] | Manufactured housing | Single External Source [Member]
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure	123,000,000
Fair Value, Inputs, Level 3 [Member] | Manufactured housing | Other
Available-For-Sale, at Fair Value:
Available-for-sale Securities, Fair Value Disclosure		107,000,000
Fair Value, Inputs, Level 3 [Member] | Other
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	4,000,000	8,000,000
Fair Value, Inputs, Level 3 [Member] | Other | Median of External Sources [Member]
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	3,000,000
Fair Value, Inputs, Level 3 [Member] | Other | Single External Source [Member]
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure		7,000,000
Fair Value, Inputs, Level 3 [Member] | Other | Discounted Cash Flows [Member]
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure	1,000,000
Fair Value, Inputs, Level 3 [Member] | Other | Other
Trading, at Fair Value:
Trading Securities, Fair Value Disclosure		1,000,000
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Freddie Mac | Weighted Average [Member] | Risk Metric [Member]
Fair Value Inputs, Quantitative Information [Abstract]
Effective Duration	3 years 9 months 26 days	2 years 5 months 9 days
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Freddie Mac | Weighted Average [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	103.8
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Freddie Mac | Weighted Average [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		99.3
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Freddie Mac | Weighted Average [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	0.83%
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Freddie Mac | Minimum [Member] | Risk Metric [Member]
Fair Value Inputs, Quantitative Information [Abstract]
Effective Duration	2 months 5 days	2 years 3 months
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Freddie Mac | Minimum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	103.2
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Freddie Mac | Minimum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		99.3
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Freddie Mac | Minimum [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	-1.46%
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Freddie Mac | Maximum [Member] | Risk Metric [Member]
Fair Value Inputs, Quantitative Information [Abstract]
Effective Duration	7 years 6 months 15 days	5 years 2 months 1 day
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Freddie Mac | Maximum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	104.4
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Freddie Mac | Maximum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		99.3
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Freddie Mac | Maximum [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	1.44%
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Fannie Mae | Weighted Average [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		104.7
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Fannie Mae | Weighted Average [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		110.5
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Fannie Mae | Minimum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		104.1
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Fannie Mae | Minimum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		110.5
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Fannie Mae | Maximum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		105.3
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Fannie Mae | Maximum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		110.5
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | CMBS | Weighted Average [Member] | Risk Metric [Member]
Fair Value Inputs, Quantitative Information [Abstract]
Effective Duration	9 years 7 months 2 days
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | CMBS | Weighted Average [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		90.9
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | CMBS | Weighted Average [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	4.21%
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | CMBS | Minimum [Member] | Risk Metric [Member]
Fair Value Inputs, Quantitative Information [Abstract]
Effective Duration	5 years 10 months 2 days
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | CMBS | Minimum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		90.9
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | CMBS | Minimum [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	1.81%
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | CMBS | Maximum [Member] | Risk Metric [Member]
Fair Value Inputs, Quantitative Information [Abstract]
Effective Duration	10 years 7 months 24 days
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | CMBS | Maximum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		90.9
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | CMBS | Maximum [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	7.66%
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Subprime | Weighted Average [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	73.5	68.7
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Subprime | Minimum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	71	64.5
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Subprime | Maximum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	76.1	73.8
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Option ARM | Weighted Average [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	67.9	64.4
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Option ARM | Weighted Average [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS		7.29%
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Option ARM | Minimum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	65.3	60.8
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Option ARM | Minimum [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS		4.61%
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Option ARM | Maximum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	70.9	67
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Option ARM | Maximum [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS		9.44%
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Alt-A and other | Weighted Average [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	84.5	75.7
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Alt-A and other | Weighted Average [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		83.4
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Alt-A and other | Minimum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	83	72.5
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Alt-A and other | Minimum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		83.4
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Alt-A and other | Maximum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	86.2	79.1
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Alt-A and other | Maximum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)		83.4
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Obligations of states and political subdivisions | Weighted Average [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	101.6	99.2
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Obligations of states and political subdivisions | Minimum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	101.3	98.7
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Obligations of states and political subdivisions | Maximum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	101.9	99.7
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Manufactured housing | Weighted Average [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	91	89.7
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Manufactured housing | Weighted Average [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	89.8
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Manufactured housing | Minimum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	89.3	86.7
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Manufactured housing | Minimum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	89.8
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Manufactured housing | Maximum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	92.4	92.8
Fair Value, Inputs, Level 3 [Member] | Available-For-Sale Mortgage-Related Securities [Member] | Manufactured housing | Maximum [Member] | Single External Source [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	89.8
Fair Value, Inputs, Level 3 [Member] | Trading Mortgage Related Securities [Member] | Freddie Mac | Weighted Average [Member] | Risk Metric [Member]
Fair Value Inputs, Quantitative Information [Abstract]
Effective Duration	2 years 3 months 7 days
Fair Value, Inputs, Level 3 [Member] | Trading Mortgage Related Securities [Member] | Freddie Mac | Weighted Average [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	1.69%	3.64%
Fair Value, Inputs, Level 3 [Member] | Trading Mortgage Related Securities [Member] | Freddie Mac | Minimum [Member] | Risk Metric [Member]
Fair Value Inputs, Quantitative Information [Abstract]
Effective Duration	1 year 9 months 11 days
Fair Value, Inputs, Level 3 [Member] | Trading Mortgage Related Securities [Member] | Freddie Mac | Minimum [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	-2.19%	-0.05%
Fair Value, Inputs, Level 3 [Member] | Trading Mortgage Related Securities [Member] | Freddie Mac | Maximum [Member] | Risk Metric [Member]
Fair Value Inputs, Quantitative Information [Abstract]
Effective Duration	2 years 3 months 18 days
Fair Value, Inputs, Level 3 [Member] | Trading Mortgage Related Securities [Member] | Freddie Mac | Maximum [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	97.48%	94.41%
Fair Value, Inputs, Level 3 [Member] | Trading Mortgage Related Securities [Member] | Fannie Mae | Weighted Average [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	2.04%	1.99%
Fair Value, Inputs, Level 3 [Member] | Trading Mortgage Related Securities [Member] | Fannie Mae | Minimum [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	-1.73%	-22.57%
Fair Value, Inputs, Level 3 [Member] | Trading Mortgage Related Securities [Member] | Fannie Mae | Maximum [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	20.27%	22.95%
Fair Value, Inputs, Level 3 [Member] | Other Asset [Member]
Other assets:
Total other assets	1,631,000,000	1,620,000,000
Fair Value, Inputs, Level 3 [Member] | Guarantee Asset [Member]
Other assets:
Guarantee Assets Fair Value Disclosure	1,626,000,000	1,611,000,000
Fair Value, Inputs, Level 3 [Member] | Guarantee Asset [Member] | Median of External Sources [Member]
Other assets:
Guarantee Assets Fair Value Disclosure	341,000,000	448,000,000
Fair Value, Inputs, Level 3 [Member] | Guarantee Asset [Member] | Discounted Cash Flows [Member]
Other assets:
Guarantee Assets Fair Value Disclosure	1,285,000,000	1,163,000,000
Fair Value, Inputs, Level 3 [Member] | Guarantee Asset [Member] | Weighted Average [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	16.6	19.2
Fair Value, Inputs, Level 3 [Member] | Guarantee Asset [Member] | Weighted Average [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	0.53%	0.53%
Fair Value, Inputs, Level 3 [Member] | Guarantee Asset [Member] | Minimum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	10	11.6
Fair Value, Inputs, Level 3 [Member] | Guarantee Asset [Member] | Minimum [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	0.17%	0.16%
Fair Value, Inputs, Level 3 [Member] | Guarantee Asset [Member] | Maximum [Member] | Median of External Sources [Member]
Fair Value Inputs, Quantitative Information [Abstract]
External Pricing Source(s)	21.2	25.4
Fair Value, Inputs, Level 3 [Member] | Guarantee Asset [Member] | Maximum [Member] | Discounted Cash Flows [Member]
Fair Value Inputs, Quantitative Information [Abstract]
OAS	2.02%	2.02%
Fair Value, Inputs, Level 3 [Member] | All Other Assets [Member]
Other assets:
All Other Assets Fair Value Disclosure	5,000,000	9,000,000
Fair Value, Inputs, Level 3 [Member] | All Other Assets [Member] | Other
Other assets:
All Other Assets Fair Value Disclosure	5,000,000	9,000,000

Fair_Value_Disclosures_Fair_Va

Fair Value Disclosures Fair Value Disclosures - Quantitative Information about Non-Recurring Level 3 Fair Value Measurements (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Assets, Fair Value Disclosure [Abstract]
REO Disposition Severity Ratio	34.70%	36.50%
Fair Value, Measurements, Nonrecurring [Member]
Assets, Fair Value Disclosure [Abstract]
Mortgage Loans Fair Value Disclosure	9,042,000,000	515,000,000
Reo Net Fair Value Disclosure	1,665,000,000	1,837,000,000
Fair Value, Measurements, Nonrecurring [Member] | Mortgage loans [Member]
Assets, Fair Value Disclosure [Abstract]
Mortgage Loans Fair Value Disclosure	8,962,000,000	515,000,000
Fair Value, Measurements, Nonrecurring [Member] | Reo Net At Fair Value [Member]
Assets, Fair Value Disclosure [Abstract]
Reo Net Fair Value Disclosure	1,665,000,000	1,837,000,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Mortgage Loans Fair Value Disclosure	8,962,000,000	515,000,000
Reo Net Fair Value Disclosure	1,665,000,000	1,837,000,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage loans [Member]
Assets, Fair Value Disclosure [Abstract]
Mortgage Loans Fair Value Disclosure	8,962,000,000	515,000,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage loans [Member] | Minimum [Member] | Income Capitalization [Member]
Assets, Fair Value Disclosure [Abstract]
Capitalization rates	6.00%	6.00%
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage loans [Member] | Minimum [Member] | Third-Party Appraisal [Member]
Assets, Fair Value Disclosure [Abstract]
Property Value	11,000,000	4,000,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage loans [Member] | Minimum [Member] | Internal Model [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value Inputs Historical Sale Proceeds	3,000
Housing Sales Index	0.38%
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage loans [Member] | Maximum [Member] | Income Capitalization [Member]
Assets, Fair Value Disclosure [Abstract]
Capitalization rates	9.00%	9.00%
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage loans [Member] | Maximum [Member] | Third-Party Appraisal [Member]
Assets, Fair Value Disclosure [Abstract]
Property Value	44,000,000	44,000,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage loans [Member] | Maximum [Member] | Internal Model [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value Inputs Historical Sale Proceeds	896,519
Housing Sales Index	2.94%
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage loans [Member] | Weighted Average [Member] | Income Capitalization [Member]
Assets, Fair Value Disclosure [Abstract]
Capitalization rates	7.00%	7.00%
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage loans [Member] | Weighted Average [Member] | Third-Party Appraisal [Member]
Assets, Fair Value Disclosure [Abstract]
Property Value	31,000,000	27,000,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage loans [Member] | Weighted Average [Member] | Internal Model [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value Inputs Historical Sale Proceeds	162,556
Housing Sales Index	0.82%
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Reo Net At Fair Value [Member] | Internal Model [Member]
Assets, Fair Value Disclosure [Abstract]
Reo Net Fair Value Disclosure	1,665,000,000	1,837,000,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Reo Net At Fair Value [Member] | Minimum [Member] | Internal Model [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value Inputs Historical Sale Proceeds	3,008
Fair Value Inputs Historical Average Sale Proceeds By State Per Property		17,500
Housing Sales Index	0.38%
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Reo Net At Fair Value [Member] | Maximum [Member] | Internal Model [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value Inputs Historical Sale Proceeds	896,519
Fair Value Inputs Historical Average Sale Proceeds By State Per Property		318,391
Housing Sales Index	2.94%
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Reo Net At Fair Value [Member] | Weighted Average [Member] | Internal Model [Member]
Assets, Fair Value Disclosure [Abstract]
Fair Value Inputs Historical Sale Proceeds	154,165
Fair Value Inputs Historical Average Sale Proceeds By State Per Property		105,508
Housing Sales Index	0.82%

Fair_Value_Disclosures_Fair_Va1

Fair Value Disclosures - Fair Value of Financial Instruments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Mortgage loans:
Derivative Assets	$822,000,000	$1,063,000,000
Debt, net:
Derivative liabilities, net	1,963,000,000	180,000,000
Held by consolidated trusts
Debt, net:
Debt, Net	42,000,000	59,000,000
Freddie Mac parent
Debt, net:
Debt, Net	5,820,000,000	2,683,000,000
GAAP Carrying Amount
Financial Assets
Cash and Cash Equivalents	10,928,000,000	11,281,000,000
Restricted Cash and Cash Equivalents	8,535,000,000	12,265,000,000
Federal Funds Sold and Securities Purchased under Agreements to Resell	51,903,000,000	62,383,000,000
Investments in Securities [Abstract]
Available-for-sale, at fair value	106,550,000,000	128,919,000,000
Trading, at fair value	30,437,000,000	23,404,000,000
Total investments in securities	136,987,000,000	152,323,000,000
Mortgage loans:
Mortgage loans	1,700,580,000,000	1,684,790,000,000
Derivative Assets	822,000,000	1,063,000,000
Guarantee Assets	1,626,000,000	1,611,000,000
Total financial assets	1,911,381,000,000	1,925,716,000,000
Debt, net:
Debt, Net	1,929,542,000,000	1,940,751,000,000
Derivative liabilities, net	1,963,000,000	180,000,000
Guarantee obligation	1,623,000,000	1,522,000,000
Total Financial Liabilities	1,933,128,000,000	1,942,453,000,000
GAAP Carrying Amount | Held by consolidated trusts
Mortgage loans:
Mortgage loans	1,558,094,000,000	1,529,905,000,000
Debt, net:
Debt, Net	1,479,473,000,000	1,433,984,000,000
GAAP Carrying Amount | Freddie Mac parent
Mortgage loans:
Mortgage loans	142,486,000,000	154,885,000,000
Debt, net:
Debt, Net	450,069,000,000	506,767,000,000
Fair Value
Financial Assets
Cash and Cash Equivalents	10,928,000,000	11,281,000,000
Restricted Cash and Cash Equivalents	8,535,000,000	12,265,000,000
Federal Funds Sold and Securities Purchased under Agreements to Resell	51,903,000,000	62,383,000,000
Investments in Securities [Abstract]
Available-for-sale, at fair value	106,550,000,000	128,919,000,000
Trading, at fair value	30,437,000,000	23,404,000,000
Total investments in securities	136,987,000,000	152,323,000,000
Mortgage loans:
Mortgage loans	1,726,770,000,000	1,645,952,000,000
Derivative Assets	822,000,000	1,063,000,000
Guarantee Assets	1,837,000,000	1,879,000,000
Total financial assets	1,937,782,000,000	1,887,146,000,000
Fair value, Cash and Cash equivalent, Level 2 to Level 1 reclass, amount	3,900,000,000
Debt, net:
Debt, Net	1,980,991,000,000	1,949,743,000,000
Derivative liabilities, net	1,963,000,000	180,000,000
Guarantee obligation	3,127,000,000	3,067,000,000
Total Financial Liabilities	1,986,081,000,000	1,952,990,000,000
Fair Value | Held by consolidated trusts
Mortgage loans:
Mortgage loans	1,585,308,000,000	1,507,742,000,000
Debt, net:
Debt, Net	1,522,872,000,000	1,436,898,000,000
Fair value, Debt instrument, Level 2 to Level 3 correction, amount	1,700,000,000
Fair Value | Freddie Mac parent
Mortgage loans:
Mortgage loans	141,462,000,000	138,210,000,000
Debt, net:
Debt, Net	458,119,000,000	512,845,000,000
Fair Value | Netting Adjustments
Financial Assets
Cash and Cash Equivalents	0	0
Restricted Cash and Cash Equivalents	0	0
Federal Funds Sold and Securities Purchased under Agreements to Resell	0	0
Investments in Securities [Abstract]
Available-for-sale, at fair value	0	0
Trading, at fair value	0	0
Total investments in securities	0	0
Mortgage loans:
Mortgage loans	0	0
Derivative Assets	-9,122,000,000	-13,168,000,000
Guarantee Assets	0	0
Total financial assets	-9,122,000,000	-13,168,000,000
Debt, net:
Debt, Net	0	0
Derivative liabilities, net	-11,597,000,000	-13,447,000,000
Guarantee obligation	0	0
Total Financial Liabilities	-11,597,000,000	-13,447,000,000
Fair Value | Netting Adjustments | Held by consolidated trusts
Mortgage loans:
Mortgage loans	0	0
Debt, net:
Debt, Net	0	0
Fair Value | Netting Adjustments | Freddie Mac parent
Mortgage loans:
Mortgage loans	0	0
Debt, net:
Debt, Net	0	0
Fair Value | Level 1
Financial Assets
Cash and Cash Equivalents	10,928,000,000	11,281,000,000
Restricted Cash and Cash Equivalents	8,535,000,000	12,264,000,000
Federal Funds Sold and Securities Purchased under Agreements to Resell	0	0
Investments in Securities [Abstract]
Available-for-sale, at fair value	0	0
Trading, at fair value	6,682,000,000	6,636,000,000
Total investments in securities	6,682,000,000	6,636,000,000
Mortgage loans:
Mortgage loans	0	0
Derivative Assets	5,000,000	0
Guarantee Assets	0	0
Total financial assets	26,150,000,000	30,181,000,000
Debt, net:
Debt, Net	0	0
Derivative liabilities, net	28,000,000	0
Guarantee obligation	0	0
Total Financial Liabilities	28,000,000	0
Fair Value | Level 1 | Held by consolidated trusts
Mortgage loans:
Mortgage loans	0	0
Debt, net:
Debt, Net	0	0
Fair Value | Level 1 | Freddie Mac parent
Mortgage loans:
Mortgage loans	0	0
Debt, net:
Debt, Net	0	0
Fair Value | Level 2
Financial Assets
Cash and Cash Equivalents	0	0
Restricted Cash and Cash Equivalents	0	1,000,000
Federal Funds Sold and Securities Purchased under Agreements to Resell	51,903,000,000	62,383,000,000
Investments in Securities [Abstract]
Available-for-sale, at fair value	64,655,000,000	76,770,000,000
Trading, at fair value	22,591,000,000	16,122,000,000
Total investments in securities	87,246,000,000	92,892,000,000
Mortgage loans:
Mortgage loans	1,409,717,000,000	1,274,194,000,000
Derivative Assets	9,912,000,000	14,220,000,000
Guarantee Assets	0	0
Total financial assets	1,558,778,000,000	1,443,690,000,000
Debt, net:
Debt, Net	1,966,256,000,000	1,933,964,000,000
Derivative liabilities, net	13,495,000,000	13,291,000,000
Guarantee obligation	0	0
Total Financial Liabilities	1,979,751,000,000	1,947,255,000,000
Fair Value | Level 2 | Held by consolidated trusts
Mortgage loans:
Mortgage loans	1,387,412,000,000	1,258,049,000,000
Debt, net:
Debt, Net	1,521,508,000,000	1,434,208,000,000
Fair Value | Level 2 | Freddie Mac parent
Mortgage loans:
Mortgage loans	22,305,000,000	16,145,000,000
Debt, net:
Debt, Net	444,748,000,000	499,756,000,000
Fair Value | Level 3
Financial Assets
Cash and Cash Equivalents	0	0
Restricted Cash and Cash Equivalents	0	0
Federal Funds Sold and Securities Purchased under Agreements to Resell	0	0
Investments in Securities [Abstract]
Available-for-sale, at fair value	41,895,000,000	52,149,000,000
Trading, at fair value	1,164,000,000	646,000,000
Total investments in securities	43,059,000,000	52,795,000,000
Mortgage loans:
Mortgage loans	317,053,000,000	371,758,000,000
Derivative Assets	27,000,000	11,000,000
Guarantee Assets	1,837,000,000	1,879,000,000
Total financial assets	361,976,000,000	426,443,000,000
Debt, net:
Debt, Net	14,735,000,000	15,779,000,000
Derivative liabilities, net	37,000,000	336,000,000
Guarantee obligation	3,127,000,000	3,067,000,000
Total Financial Liabilities	17,899,000,000	19,182,000,000
Fair Value | Level 3 | Held by consolidated trusts
Mortgage loans:
Mortgage loans	197,896,000,000	249,693,000,000
Debt, net:
Debt, Net	1,364,000,000	2,690,000,000
Fair Value | Level 3 | Freddie Mac parent
Mortgage loans:
Mortgage loans	119,157,000,000	122,065,000,000
Debt, net:
Debt, Net	$13,371,000,000	$13,089,000,000

Fair_Value_Disclosures_Differe

Fair Value Disclosures - Difference between Fair Value and Unpaid Principal Balance for Certain Financial Instruments with Fair Value Option Elected (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value Disclosures [Abstract]
Loans Held For Sale, Fair Value	$12,130	$8,727
Loans Held For Sale, Unpaid Principal Balance, With Fair Value Option Elected	11,872	8,721
Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables	258	6
Long-Term Debt, Fair Value	5,820	2,683
Long-Term Debt, Unpaid Principal Balance, with Fair Value Option Elected	5,896	2,635
Fair Value, Option, Aggregate Differences, Long-term Debt Instruments	($76)	$48

Legal_Contingencies_Details

Legal Contingencies (Details) (USD $)	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Dec. 29, 2014	Sep. 15, 2014	Dec. 16, 2011	14-May-10	Mar. 14, 2014	Dec. 31, 2012	Dec. 31, 2011
				numberofdefendants		numberofdefendants
Loss Contingencies [Line Items]
Legal fees and expenses of former officers for indemnification obligations	$15,000,000
Unrecognized tax benefits	0
Lloyds [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value		111,000,000
Deloitte & Touche LLP
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value			1,300,000,000
Related Third Party Litigation And Indemnification Requests | SEC litigation
Loss Contingencies [Line Items]
Number of defendants				3
Unasserted claim | TBW Bankruptcy, Underwriters
Loss Contingencies [Line Items]
Amount of mortgage bankers bonds to be rescinded					90,000,000
IRS Litigation
Loss Contingencies [Line Items]
Amount of additional income taxes and penalties assessed in statutory notices 1998 To 2007								3,000,000,000
Amount of tax paid in the statutory notices received for the years 2006 and 2007							36,000,000
Unrecognized tax benefits							0
LIBOR Lawsuit
Loss Contingencies [Line Items]
Number of defendants						16
Litigation Concerning the Purchase Agreement | Arrowood lawsuit
Loss Contingencies [Line Items]
Preferred Stock, Value, Outstanding	$42,297,500

Regulatory_Capital_Details

Regulatory Capital (Details) (USD $)	3 Months Ended				12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2008
Mortgage Banking [Abstract]
Capital Requirement For On Balance Sheet Assets	2.50%				2.50%
Capital Requirement For Off Balance Sheet Obligations	0.45%				0.45%
Critical Capital Requirement For On Balance Sheet Assets	1.25%				1.25%
Critical Capital Requirement For Off Balance Sheet Obligations	0.25%				0.25%
Number of days of net worth deficit requiring FHFA to place us into receivership	60 days
Expected Draw Request To Treasury Under Purchase Agreement	$0				$0
Aggregate Funding Received From Treasury Under Purchase Agreement	71,300,000,000				71,300,000,000
Initial liquidation preference of senior preferred stock								1,000,000,000
Cash amount received as a result of issuing the initial liquidation preference								0
Cash dividends paid on senior preferred stock	$2,800,000,000	$1,900,000,000	$4,500,000,000	$10,400,000,000	$19,610,000,000	$47,591,000,000	$7,233,000,000

Regulatory_Capital_Regulatory_

Regulatory Capital Regulatory Capital - Net Worth and Minimum Capital (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Net Worth and Minimum Capital [Abstract]
GAAP net worth (deficit)	$2,651	$12,835	$8,827	($146)
Core capital (deficit)	-71,415	-59,495
Minimum capital requirement	20,090	21,404
Minimum capital surplus (deficit)	($91,505)	($80,899)

Selected_Financial_Statement_L2

Selected Financial Statement Line Items - Significant Components of Other Income (Loss) on Our Consolidated Statements of Comprehensive Income (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other income (loss):
Non-agency mortgage-related securities settlements	$6,084	$5,501	$0
Gains (losses) on mortgage loans	731	-336	1,010
Other	1,229	1,485	1,180
Total other income (loss)	$8,044	$6,650	$2,190

Selected_Financial_Statement_L3

Selected Financial Statement Line Items - Significant Components of Other Assets and Other Liabilities on Our Consolidated Balance Sheets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Other assets:
Accounts and other receivables	$3,899	$4,367
Current income tax receivable	1,048	1,316
Guarantee asset	1,626	1,611
All other	1,121	1,245
Total other assets	7,694	8,539
Other liabilities:
Servicer liabilities	1,847	2,277
Guarantee obligation	1,623	1,522
Accounts payable and accrued expenses	803	886
All other	785	807
Total other liabilities	$5,058	$5,492