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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Tax Credit Carryforward [Line Items]                      
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount                   $ (58,300,000,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance $ (5,300,000,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Income Tax Expense (Benefit) 818,000,000us-gaap_IncomeTaxExpenseBenefit 1,787,000,000us-gaap_IncomeTaxExpenseBenefit 1,752,000,000us-gaap_IncomeTaxExpenseBenefit 2,584,000,000us-gaap_IncomeTaxExpenseBenefit 1,816,000,000us-gaap_IncomeTaxExpenseBenefit 1,355,000,000us-gaap_IncomeTaxExpenseBenefit 1,985,000,000us-gaap_IncomeTaxExpenseBenefit (50,571,000,000)us-gaap_IncomeTaxExpenseBenefit 6,941,000,000us-gaap_IncomeTaxExpenseBenefit (45,415,000,000)us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit
Capital Loss Carryforward, Valuation Allowance (150,000,000)fnm_CapitalLossCarryforwardValuationAllowance               (150,000,000)fnm_CapitalLossCarryforwardValuationAllowance    
Deferred Tax Assets, Operating Loss Carryforwards 0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards               0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards    
Deferred Tax Assets, Tax Credit Carryforwards, Partnership, Net of Uncertain Tax Position Liabilities 3,000,000,000fnm_DeferredTaxAssetsTaxCreditCarryforwardsPartnershipNetofUncertainTaxPositionLiabilities               3,000,000,000fnm_DeferredTaxAssetsTaxCreditCarryforwardsPartnershipNetofUncertainTaxPositionLiabilities    
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 328,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax               328,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax    
Deferred tax assets:                      
Allowance for loan losses and basis in acquired property, net 17,435,000,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses       20,918,000,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses       17,435,000,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses 20,918,000,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses  
Mortgage and mortgage-related assets 16,250,000,000fnm_MortgageAndMortgageRelatedAssetsIncludingAcquiredCreditImpairedLoans       16,350,000,000fnm_MortgageAndMortgageRelatedAssetsIncludingAcquiredCreditImpairedLoans       16,250,000,000fnm_MortgageAndMortgageRelatedAssetsIncludingAcquiredCreditImpairedLoans 16,350,000,000fnm_MortgageAndMortgageRelatedAssetsIncludingAcquiredCreditImpairedLoans  
Debt and derivative instruments 4,254,000,000us-gaap_DeferredTaxAssetsDerivativeInstruments       3,958,000,000us-gaap_DeferredTaxAssetsDerivativeInstruments       4,254,000,000us-gaap_DeferredTaxAssetsDerivativeInstruments 3,958,000,000us-gaap_DeferredTaxAssetsDerivativeInstruments  
Partnership credits 2,918,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther       4,172,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther       2,918,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther 4,172,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther  
Partnership and other equity investments 934,000,000us-gaap_DeferredTaxAssetsEquityMethodInvestments       1,255,000,000us-gaap_DeferredTaxAssetsEquityMethodInvestments       934,000,000us-gaap_DeferredTaxAssetsEquityMethodInvestments 1,255,000,000us-gaap_DeferredTaxAssetsEquityMethodInvestments  
Other, net 1,699,000,000us-gaap_DeferredTaxAssetsOther       2,300,000,000us-gaap_DeferredTaxAssetsOther       1,699,000,000us-gaap_DeferredTaxAssetsOther 2,300,000,000us-gaap_DeferredTaxAssetsOther  
Total deferred tax assets 43,490,000,000us-gaap_DeferredTaxAssetsGross       48,953,000,000us-gaap_DeferredTaxAssetsGross       43,490,000,000us-gaap_DeferredTaxAssetsGross 48,953,000,000us-gaap_DeferredTaxAssetsGross  
Deferred tax liabilities:                      
Unrealized gains on AFS securities, net 1,134,000,000fnm_DeferredTaxAssetsUnrealizedGainsOnAvailableForSaleSecuritiesGross       868,000,000fnm_DeferredTaxAssetsUnrealizedGainsOnAvailableForSaleSecuritiesGross       1,134,000,000fnm_DeferredTaxAssetsUnrealizedGainsOnAvailableForSaleSecuritiesGross 868,000,000fnm_DeferredTaxAssetsUnrealizedGainsOnAvailableForSaleSecuritiesGross  
Total deferred tax liabilities 1,134,000,000us-gaap_DeferredIncomeTaxLiabilities       868,000,000us-gaap_DeferredIncomeTaxLiabilities       1,134,000,000us-gaap_DeferredIncomeTaxLiabilities 868,000,000us-gaap_DeferredIncomeTaxLiabilities  
Valuation allowance (150,000,000)us-gaap_DeferredTaxAssetsValuationAllowance       (525,000,000)us-gaap_DeferredTaxAssetsValuationAllowance       (150,000,000)us-gaap_DeferredTaxAssetsValuationAllowance (525,000,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Net deferred tax assets 42,206,000,000us-gaap_DeferredTaxAssetsLiabilitiesNet       47,560,000,000us-gaap_DeferredTaxAssetsLiabilitiesNet       42,206,000,000us-gaap_DeferredTaxAssetsLiabilitiesNet 47,560,000,000us-gaap_DeferredTaxAssetsLiabilitiesNet  
Expired Capital Loss Carryforward [Member]                      
Tax Credit Carryforward [Line Items]                      
Tax Credit Carryforward, Amount 1,000,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= fnm_ExpiredCapitalLossCarryForwardMember
              1,000,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= fnm_ExpiredCapitalLossCarryForwardMember
   
Capital Loss Carryforward [Member]                      
Tax Credit Carryforward [Line Items]                      
Tax Credit Carryforward, Amount $ 427,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_CapitalLossCarryforwardMember
              $ 427,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_CapitalLossCarryforwardMember