v3.26.3
Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Mortgage Loans [Abstract]    
Mortgage loans FVO held-for-investment $ 6,298 $ 7,005
Derivative Assets Net [Abstract]    
Derivative Asset 2,737 1,466
Other Assets [Abstract]    
Netting adjustments (4,000) (2,998)
Total other assets 6,964 6,421
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 5,789 5,841
Other liabilities    
Derivative liabilities, netting Adjustment (4,000) (2,998)
Total Other Liabilities, Fair Value 1,852 781
Fair Value, Measurements, Recurring    
Available-For-Sale, at Fair Value:    
Debt Securities, Available-for-sale 2,158 3,316
Trading, at Fair Value:    
Trading securities, at fair value 76,009 82,096
Total investments in securities 78,167 85,412
Mortgage Loans [Abstract]    
Mortgage loans FVO held-for-investment 6,298 7,005
Derivative Assets Net [Abstract]    
Derivative assets, net 2,737 1,466
Other Assets [Abstract]    
Guarantee Assets 3,946 4,728
Derivative assets, net 2,737 1,466
All Other Assets 281 227
Netting adjustments (5,214) (3,874)
Total other assets 6,964 6,421
Total Assets carried at fair value on a recurring basis 91,429 98,838
Other liabilities    
Derivative liabilities at fair value 1,839 781
All Other Liabilities, at Fair Value 13  
Derivative liabilities, netting Adjustment (5,971) (3,979)
Total Other Liabilities, Fair Value 1,852  
Total liabilities carried at fair value on a recurring basis 7,818 6,817
Fair Value, Measurements, Recurring | Held by consolidated trusts    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 5,789 5,841
Fair Value, Measurements, Recurring | Held by Freddie Mac    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 177 195
Fair Value, Measurements, Recurring | Mortage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 10,781 10,932
Fair Value, Measurements, Recurring | Non-mortgage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 65,228 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 65,228 70,916
Total investments in securities 65,228 70,916
Mortgage Loans [Abstract]    
Mortgage loans FVO held-for-investment 0 0
Derivative Assets Net [Abstract]    
Derivative assets, net 35 5
Other Assets [Abstract]    
Guarantee Assets 0 0
Derivative assets, net 35 5
All Other Assets 0 0
Total other assets 35 5
Total Assets carried at fair value on a recurring basis 65,263 70,921
Other liabilities    
Derivative liabilities at fair value 17 0
All Other Liabilities, at Fair Value 0  
Total Other Liabilities, Fair Value 17  
Total liabilities carried at fair value on a recurring basis 17 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 65,228 70,916
Fair Value, Measurements, Recurring | Level 2    
Available-For-Sale, at Fair Value:    
Debt Securities, Available-for-sale 1,594 2,616
Trading, at Fair Value:    
Trading securities, at fair value 8,454 8,394
Total investments in securities 10,048 11,010
Mortgage Loans [Abstract]    
Mortgage loans FVO held-for-investment 5,045 5,587
Derivative Assets Net [Abstract]    
Derivative assets, net 7,881 5,261
Other Assets [Abstract]    
Guarantee Assets 0 0
Derivative assets, net 7,881 5,261
All Other Assets 0 0
Total other assets 7,881 5,261
Total Assets carried at fair value on a recurring basis 22,974 21,858
Other liabilities    
Derivative liabilities at fair value 7,128 4,708
All Other Liabilities, at Fair Value 0  
Total Other Liabilities, Fair Value 7,128  
Total liabilities carried at fair value on a recurring basis 13,000 10,641
Fair Value, Measurements, Recurring | Level 2 | Held by consolidated trusts    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 5,749 5,808
Fair Value, Measurements, Recurring | Level 2 | Held by Freddie Mac    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 123 125
Fair Value, Measurements, Recurring | Level 2 | Mortage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 8,454 8,146
Fair Value, Measurements, Recurring | Level 2 | Non-mortgage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 0 248
Fair Value, Measurements, Recurring | Level 3    
Available-For-Sale, at Fair Value:    
Debt Securities, Available-for-sale 564 700
Trading, at Fair Value:    
Trading securities, at fair value 2,327 2,786
Total investments in securities 2,891 3,486
Mortgage Loans [Abstract]    
Mortgage loans FVO held-for-investment 1,253 1,418
Derivative Assets Net [Abstract]    
Derivative assets, net 35 74
Other Assets [Abstract]    
Guarantee Assets 3,946 4,728
Derivative assets, net 35 74
All Other Assets 281 227
Total other assets 4,262 5,029
Total Assets carried at fair value on a recurring basis 8,406 9,933
Other liabilities    
Derivative liabilities at fair value 665 52
All Other Liabilities, at Fair Value 13  
Total Other Liabilities, Fair Value 678  
Total liabilities carried at fair value on a recurring basis 772 155
Fair Value, Measurements, Recurring | Level 3 | Held by consolidated trusts    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 40 33
Fair Value, Measurements, Recurring | Level 3 | Held by Freddie Mac    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 54 70
Fair Value, Measurements, Recurring | Level 3 | Mortage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 2,327 2,786
Fair Value, Measurements, Recurring | Level 3 | Non-mortgage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value $ 0 $ 0