Net Interest Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Components of Net Interest Income [Line Items]
Interest income, mortgage loans	$ 121,473	$ 109,117	$ 96,985
Interest income, investment securities	3,337	2,069	1,571
Interest Income, Securities Purchased under Agreements to Resell	4,573	6,083	6,135
Other	437	608	672
Interest income	129,820	117,877	105,363
Interest Expense, Operating and Nonoperating	(108,417)	(98,140)	(86,821)
Net interest income	21,403	19,737	18,542
(Provision) benefit for credit losses	(1,290)	(476)	872
Net interest income after (provision) benefit for credit losses	20,113	19,261	19,414
Interest expense	(108,417)	(98,140)	(86,821)
Held by consolidated trusts
Components of Net Interest Income [Line Items]
Interest expense of debt securities	(99,180)	(88,227)	(76,703)
Held by Freddie Mac
Components of Net Interest Income [Line Items]
Interest Expense, Short-term Borrowings	(1,018)	(578)	(388)
Interest Expense, Long-term Debt	(7,962)	(8,947)	(9,329)
Interest Expense, Securities Sold under Agreements to Repurchase	$ (257)	$ (388)	$ (401)