v3.26.1
Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Mortgage Loans [Abstract]    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure $ 2 $ 0
Mortgage loans FVO held-for-investment 6,747 7,005
Derivative Assets Net [Abstract]    
Derivative Asset 1,860 1,466
Other Assets [Abstract]    
Netting adjustments (2,998) (2,998)
Total other assets 6,351 6,421
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 5,991 5,841
Other liabilities    
Derivative liabilities, netting Adjustment (2,998) (2,998)
Fair Value, Measurements, Recurring    
Available-For-Sale, at Fair Value:    
Debt Securities, Available-for-sale 2,404 3,316
Trading, at Fair Value:    
Trading securities, at fair value 81,938 82,096
Total investments in securities 84,342 85,412
Mortgage Loans [Abstract]    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 2  
Mortgage loans FVO held-for-investment 6,747 7,005
Derivative Assets Net [Abstract]    
Derivative assets, net 1,860 1,466
Other Assets [Abstract]    
Guarantee Assets 4,247 4,728
Derivative assets, net 1,860 1,466
All Other Assets 244 227
Netting adjustments (3,815) (3,874)
Total other assets 6,351 6,421
Total Assets carried at fair value on a recurring basis 97,442 98,838
Other liabilities    
Derivative liabilities at fair value 873 781
Derivative liabilities, netting Adjustment (3,999) (3,979)
Total liabilities carried at fair value on a recurring basis 7,040 6,817
Fair Value, Measurements, Recurring | Held by consolidated trusts    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 5,991 5,841
Fair Value, Measurements, Recurring | Held by Freddie Mac    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 176 195
Fair Value, Measurements, Recurring | Mortage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 10,603 10,932
Fair Value, Measurements, Recurring | Non-mortgage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 71,335 71,164
Fair Value, Measurements, Recurring | Level 1    
Available-For-Sale, at Fair Value:    
Debt Securities, Available-for-sale 0 0
Trading, at Fair Value:    
Trading securities, at fair value 71,161 70,916
Total investments in securities 71,161 70,916
Mortgage Loans [Abstract]    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 0  
Mortgage loans FVO held-for-investment 0 0
Derivative Assets Net [Abstract]    
Derivative assets, net 2 5
Other Assets [Abstract]    
Guarantee Assets 0 0
Derivative assets, net 2 5
All Other Assets 0 0
Total other assets 2 5
Total Assets carried at fair value on a recurring basis 71,163 70,921
Other liabilities    
Derivative liabilities at fair value 8 0
Total liabilities carried at fair value on a recurring basis 8 0
Fair Value, Measurements, Recurring | Level 1 | Held by consolidated trusts    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 0 0
Fair Value, Measurements, Recurring | Level 1 | Held by Freddie Mac    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 0 0
Fair Value, Measurements, Recurring | Level 1 | Mortage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 0 0
Fair Value, Measurements, Recurring | Level 1 | Non-mortgage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 71,161 70,916
Fair Value, Measurements, Recurring | Level 2    
Available-For-Sale, at Fair Value:    
Debt Securities, Available-for-sale 1,788 2,616
Trading, at Fair Value:    
Trading securities, at fair value 8,279 8,394
Total investments in securities 10,067 11,010
Mortgage Loans [Abstract]    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 0  
Mortgage loans FVO held-for-investment 5,925 5,587
Derivative Assets Net [Abstract]    
Derivative assets, net 5,624 5,261
Other Assets [Abstract]    
Guarantee Assets 0 0
Derivative assets, net 5,624 5,261
All Other Assets 0 0
Total other assets 5,624 5,261
Total Assets carried at fair value on a recurring basis 21,616 21,858
Other liabilities    
Derivative liabilities at fair value 4,734 4,708
Total liabilities carried at fair value on a recurring basis 10,793 10,641
Fair Value, Measurements, Recurring | Level 2 | Held by consolidated trusts    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 5,939 5,808
Fair Value, Measurements, Recurring | Level 2 | Held by Freddie Mac    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 120 125
Fair Value, Measurements, Recurring | Level 2 | Mortage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 8,105 8,146
Fair Value, Measurements, Recurring | Level 2 | Non-mortgage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 174 248
Fair Value, Measurements, Recurring | Level 3    
Available-For-Sale, at Fair Value:    
Debt Securities, Available-for-sale 616 700
Trading, at Fair Value:    
Trading securities, at fair value 2,498 2,786
Total investments in securities 3,114 3,486
Mortgage Loans [Abstract]    
Loan, Mortgage, Held-for-Sale, Fair Value Disclosure 2  
Mortgage loans FVO held-for-investment 822 1,418
Derivative Assets Net [Abstract]    
Derivative assets, net 49 74
Other Assets [Abstract]    
Guarantee Assets 4,247 4,728
Derivative assets, net 49 74
All Other Assets 244 227
Total other assets 4,540 5,029
Total Assets carried at fair value on a recurring basis 8,478 9,933
Other liabilities    
Derivative liabilities at fair value 130 52
Total liabilities carried at fair value on a recurring basis 238 155
Fair Value, Measurements, Recurring | Level 3 | Held by consolidated trusts    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 52 33
Fair Value, Measurements, Recurring | Level 3 | Held by Freddie Mac    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 56 70
Fair Value, Measurements, Recurring | Level 3 | Mortage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 2,498 2,786
Fair Value, Measurements, Recurring | Level 3 | Non-mortgage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value $ 0 $ 0