v3.25.3
Fair Value Disclosures - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Mortgage Loans [Abstract]    
Held-for-sale, at fair value $ 0 $ 11,394
Mortgage loans FVO held-for-investment 7,107 2,413
Derivative Assets Net [Abstract]    
Derivative Asset 958 501
Other Assets [Abstract]    
Netting adjustments (3,044) (3,906)
Total other assets 6,048 5,870
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 5,697 2,339
Other liabilities    
Netting Adjustment (3,044) (3,906)
Total other liabilities 729 978
Held by consolidated trusts    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 5,500 2,000
Held by Freddie Mac    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 200 300
Fair Value, Measurements, Recurring    
Available-For-Sale, at Fair Value:    
Debt Securities, Available-for-sale 3,641 3,899
Trading, at Fair Value:    
Trading securities, at fair value 80,214 51,872
Total investments in securities 83,855 55,771
Mortgage Loans [Abstract]    
Held-for-sale, at fair value 0 11,394
Mortgage loans FVO held-for-investment 7,107 2,413
Derivative Assets Net [Abstract]    
Derivative assets, net 958 501
Other Assets [Abstract]    
Guarantee Assets 4,871 5,126
Derivative assets, net 958 501
All Other Assets 219 243
Netting adjustments (4,342) (5,989)
Total other assets 6,048 5,870
Total Assets carried at fair value on a recurring basis 97,010 75,448
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 5,697 2,339
Other liabilities    
Derivative liabilities, net 729 954
All other, at fair value   24
Netting Adjustment (4,359) (6,282)
Total other liabilities   978
Total liabilities carried at fair value on a recurring basis 6,426 3,317
Fair Value, Measurements, Recurring | Held by consolidated trusts    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 5,494 2,013
Fair Value, Measurements, Recurring | Held by Freddie Mac    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 203 326
Fair Value, Measurements, Recurring | Mortage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 10,385 9,158
Fair Value, Measurements, Recurring | Non-mortgage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 69,829 42,714
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 69,582 42,289
Total investments in securities 69,582 42,289
Mortgage Loans [Abstract]    
Held-for-sale, at fair value 0 0
Mortgage loans FVO held-for-investment 0 0
Derivative Assets Net [Abstract]    
Derivative assets, net 10 9
Other Assets [Abstract]    
Guarantee Assets 0 0
Derivative assets, net 10 9
All Other Assets 0 0
Total other assets 10 9
Total Assets carried at fair value on a recurring basis 69,592 42,298
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 0 0
Other liabilities    
Derivative liabilities, net 1 0
All other, at fair value   0
Total other liabilities   0
Total liabilities carried at fair value on a recurring basis 1 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 69,582 42,289
Fair Value, Measurements, Recurring | Level 2    
Available-For-Sale, at Fair Value:    
Debt Securities, Available-for-sale 2,922 3,316
Trading, at Fair Value:    
Trading securities, at fair value 7,565 6,556
Total investments in securities 10,487 9,872
Mortgage Loans [Abstract]    
Held-for-sale, at fair value 0 10,099
Mortgage loans FVO held-for-investment 6,030 1,572
Derivative Assets Net [Abstract]    
Derivative assets, net 5,211 6,387
Other Assets [Abstract]    
Guarantee Assets 0 0
Derivative assets, net 5,211 6,387
All Other Assets 0 24
Total other assets 5,211 6,411
Total Assets carried at fair value on a recurring basis 21,728 27,954
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 5,599 2,237
Other liabilities    
Derivative liabilities, net 5,038 7,116
All other, at fair value   5
Total other liabilities   7,121
Total liabilities carried at fair value on a recurring basis 10,637 9,358
Fair Value, Measurements, Recurring | Level 2 | Held by consolidated trusts    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 5,469 1,996
Fair Value, Measurements, Recurring | Level 2 | Held by Freddie Mac    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 130 241
Fair Value, Measurements, Recurring | Level 2 | Mortage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 7,318 6,131
Fair Value, Measurements, Recurring | Level 2 | Non-mortgage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 247 425
Fair Value, Measurements, Recurring | Level 3    
Available-For-Sale, at Fair Value:    
Debt Securities, Available-for-sale 719 583
Trading, at Fair Value:    
Trading securities, at fair value 3,067 3,027
Total investments in securities 3,786 3,610
Mortgage Loans [Abstract]    
Held-for-sale, at fair value 0 1,295
Mortgage loans FVO held-for-investment 1,077 841
Derivative Assets Net [Abstract]    
Derivative assets, net 79 94
Other Assets [Abstract]    
Guarantee Assets 4,871 5,126
Derivative assets, net 79 94
All Other Assets 219 219
Total other assets 5,169 5,439
Total Assets carried at fair value on a recurring basis 10,032 11,185
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 98 102
Other liabilities    
Derivative liabilities, net 49 120
All other, at fair value   19
Total other liabilities   139
Total liabilities carried at fair value on a recurring basis 147 241
Fair Value, Measurements, Recurring | Level 3 | Held by consolidated trusts    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 25 17
Fair Value, Measurements, Recurring | Level 3 | Held by Freddie Mac    
Liabilities, Fair Value Disclosure [Abstract]    
Debt instrument recorded at fair value 73 85
Fair Value, Measurements, Recurring | Level 3 | Mortage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value 3,067 3,027
Fair Value, Measurements, Recurring | Level 3 | Non-mortgage-related securities    
Trading, at Fair Value:    
Trading securities, at fair value $ 0 $ 0