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Short-Term Borrowings and Long-Term Debt Long-term Debt (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Long-Term Debt [Line Items]    
Long-term debt, outstanding 3,115,583,000,000us-gaap_LongTermDebt 3,160,074,000,000us-gaap_LongTermDebt
Long-term debt, weighted-average interest rate 2.93%us-gaap_LongtermDebtWeightedAverageInterestRate 3.10%us-gaap_LongtermDebtWeightedAverageInterestRate
Fannie Mae [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 355,431,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
457,139,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Long-term debt, weighted-average interest rate 2.24%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2.14%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net unamortized discount, fair value adjustments and other cost basis adjustments 4,100,000,000us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,800,000,000us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Fannie Mae [Member] | Senior Fixed [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 320,507,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedDebtMember
412,805,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedDebtMember
Long-term debt, weighted-average interest rate 2.29%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedDebtMember
2.24%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedDebtMember
Fannie Mae [Member] | Senior Fixed Benchmark Notes and Bonds [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 173,010,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedBenchmarkNotesAndBondsMember
212,234,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedBenchmarkNotesAndBondsMember
Long-term debt, weighted-average interest rate 2.41%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedBenchmarkNotesAndBondsMember
2.45%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedBenchmarkNotesAndBondsMember
Fannie Mae [Member] | Senior Fixed Medium-Term Notes [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 114,556,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedMediumTermNotesMember
161,445,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedMediumTermNotesMember
Long-term debt, weighted-average interest rate 1.42%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedMediumTermNotesMember
1.28%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedMediumTermNotesMember
Fannie Mae [Member] | Senior Fixed Foreign Exchange Notes and Bonds [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 619,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedForeignExchangeNotesAndBondsMember
682,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedForeignExchangeNotesAndBondsMember
Long-term debt, weighted-average interest rate 5.44%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedForeignExchangeNotesAndBondsMember
5.41%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedForeignExchangeNotesAndBondsMember
Fannie Mae [Member] | Senior Fixed Other Debt [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 32,322,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedOtherDebtMember
38,444,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedOtherDebtMember
Long-term debt, weighted-average interest rate 4.63%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedOtherDebtMember
4.99%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFixedOtherDebtMember
Fannie Mae [Member] | Senior Floating [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 30,873,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingDebtMember
39,396,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingDebtMember
Long-term debt, weighted-average interest rate 0.81%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingDebtMember
0.32%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingDebtMember
Fannie Mae [Member] | Senior Floating Medium-Term Notes [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 24,469,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingMediumTermNotesMember
38,441,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingMediumTermNotesMember
Long-term debt, weighted-average interest rate 0.15%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingMediumTermNotesMember
0.20%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingMediumTermNotesMember
Fannie Mae [Member] | Senior Floating Connecticut Avenue Security [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 6,041,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingConnecticutAvenueSecurityMember
689,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingConnecticutAvenueSecurityMember
Long-term debt, weighted-average interest rate 2.97%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingConnecticutAvenueSecurityMember
3.81%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingConnecticutAvenueSecurityMember
Fannie Mae [Member] | Senior Floating Other Debt [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 363,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingOtherDebtMember
266,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingOtherDebtMember
Long-term debt, weighted-average interest rate 8.71%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingOtherDebtMember
8.52%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SeniorFloatingOtherDebtMember
Fannie Mae [Member] | Subordinated Fixed [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 3,849,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
4,676,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
Long-term debt, weighted-average interest rate 9.93%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
8.76%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember
Fannie Mae [Member] | Subordinated Fixed Qualifying Subordinated [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 0us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SubordinatedFixedQualifyingSubordinatedDebtMember
1,169,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SubordinatedFixedQualifyingSubordinatedDebtMember
Long-term debt, weighted-average interest rate 0.00%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SubordinatedFixedQualifyingSubordinatedDebtMember
5.27%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SubordinatedFixedQualifyingSubordinatedDebtMember
Fannie Mae [Member] | Subordinated Fixed Subordinated Debentures [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 3,849,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SubordinatedFixedSubordinatedDebenturesMember
3,507,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SubordinatedFixedSubordinatedDebenturesMember
Long-term debt, weighted-average interest rate 9.93%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SubordinatedFixedSubordinatedDebenturesMember
9.92%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SubordinatedFixedSubordinatedDebenturesMember
Fannie Mae [Member] | Secured Borrowings [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 202,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SecuredBorrowingsMember
262,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SecuredBorrowingsMember
Long-term debt, weighted-average interest rate 1.90%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SecuredBorrowingsMember
1.86%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
/ us-gaap_LongtermDebtTypeAxis
= fnm_SecuredBorrowingsMember
Consolidated Trusts [Member]    
Long-Term Debt [Line Items]    
Long-term debt, outstanding 2,760,152,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
2,702,935,000,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Long-term debt, weighted-average interest rate 3.02%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
3.26%us-gaap_LongtermDebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Minimum [Member] | Fannie Mae [Member]    
Long-Term Debt [Line Items]    
Medium-term notes original contractual maturity 1 year 1 year
Maximum [Member] | Fannie Mae [Member]    
Long-Term Debt [Line Items]    
Medium-term notes original contractual maturity 10 years 10 years