Debt - Other Short-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Short-term Debt [Line Items]
Short-term Debt	$ 37,718	$ 14,675
Held by Freddie Mac
Short-term Debt [Line Items]
Short Term Debt Par Value	37,867	14,716
Short-term Debt	$ 37,718	$ 14,675
Short-term debt weighted average effective rate	3.82%	4.59%
Held by Freddie Mac \| Callable Short Term Notes \| Variable Rate [Member]
Short-term Debt [Line Items]
Short Term Debt Par Value	$ 3,000	$ 0

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant