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Short-Term and Long-Term Debt - Long-Term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 4,216,909 $ 4,205,404
Long-term debt, weighted-average interest rate 2.97% 2.57%
Fannie Mae    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 128,234 $ 106,751
Long-term debt, weighted-average interest rate 3.30% 2.63%
Net unamortized discount, fair value adjustments and other cost basis adjustments $ 3,600 $ 4,000
Fannie Mae | Senior Fixed    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 93,495 $ 103,731
Long-term debt, weighted-average interest rate 2.66% 2.40%
Fannie Mae | Benchmark notes and bonds    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 44,655 $ 54,727
Long-term debt, weighted-average interest rate 2.87% 2.79%
Fannie Mae | Medium-term notes    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 42,208 $ 42,217
Long-term debt, weighted-average interest rate 2.21% 1.58%
Fannie Mae | Medium-term notes | Minimum    
Long-Term Debt [Line Items]    
Contractual maturity term 1 year 1 year
Fannie Mae | Medium-term notes | Maximum    
Long-Term Debt [Line Items]    
Contractual maturity term 10 years 10 years
Fannie Mae | Other    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 6,632 $ 6,787
Long-term debt, weighted-average interest rate 3.98% 3.98%
Contractual maturity term 10 years 10 years
Fannie Mae | Senior floating    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 34,739 $ 3,020
Long-term debt, weighted-average interest rate 5.07% 10.92%
Fannie Mae | Medium-term notes    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 32,435 $ 0
Long-term debt, weighted-average interest rate 4.67% 0.00%
Fannie Mae | Connecticut Avenue Securities    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 2,055 $ 2,752
Long-term debt, weighted-average interest rate 10.99% 11.12%
Fannie Mae | Other    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 249 $ 268
Long-term debt, weighted-average interest rate 8.10% 8.79%
Consolidated Trusts    
Long-Term Debt [Line Items]    
Long-term debt, outstanding $ 4,088,675 $ 4,098,653
Long-term debt, weighted-average interest rate 2.96% 2.56%