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Equity Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity [Abstract]      
Net unrealized gains on available-for-sale securities for which we have not recorded other-than-temporary impairment, net of tax $ 592fnm_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAvailableForSaleSecuritiesOtherThanTemporaryImpairmentNotRecorded $ 365fnm_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAvailableForSaleSecuritiesOtherThanTemporaryImpairmentNotRecorded $ 1,399fnm_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAvailableForSaleSecuritiesOtherThanTemporaryImpairmentNotRecorded
Net unrealized gains (losses) on available-for-sale securities for which we have recorded OTTI, net of tax 1,529fnm_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAvailableForSaleGainLossOtherThanTemporaryImpairmentRecorded 1,262fnm_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAvailableForSaleGainLossOtherThanTemporaryImpairmentRecorded (465)fnm_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAvailableForSaleGainLossOtherThanTemporaryImpairmentRecorded
Prior service cost and actuarial gains (losses), net of amortization, net of tax (358)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (395)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (505)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Other losses (30)fnm_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAvailableForSaleGainLossOther (29)fnm_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAvailableForSaleGainLossOther (45)fnm_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAvailableForSaleGainLossOther
Accumulated other comprehensive income (loss) $ 1,733us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 1,203us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 384us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax