Allowance for Credit Losses - Schedule (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs			$ (288)		$ (371)
Ending balance	$ 7,228	$ 8,273	7,228	$ 8,273
Allowance for credit loss
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	8,113	7,451	8,505	7,239	7,239
Provision (benefit) for credit losses	(880)	783	(1,200)	1,063
Charge-offs	(182)	(100)	(424)	(292)
Recoveries collected	65	23	126	51
Other	112	116	221	212
Ending balance					8,505
Held for Investment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending balance	6,771	7,729	6,771	7,729
Other Allowance for Credit Losses
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending balance	457	544	457	544
Single family
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending balance	6,378	7,516	6,378	7,516
Single family \| Allowance for credit loss
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	7,228	6,851	7,549	6,691	6,691
Provision (benefit) for credit losses	(846)	622	(1,157)	850
Charge-offs	(181)	(96)	(359)	(287)
Recoveries collected	65	23	125	50
Other	112	116	220	212
Ending balance					7,549
Single family \| Held for Investment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending balance	6,141	7,236	6,141	7,236
Single family \| Other Allowance for Credit Losses
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending balance	237	280	237	280
Multifamily
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs			(52)		(126)
Ending balance	850	757	850	757
Multifamily \| Allowance for credit loss
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	885	600	956	548	548
Provision (benefit) for credit losses	(34)	161	(43)	213
Charge-offs	(1)	(4)	(65)	(5)
Recoveries collected	0	0	1	1
Other	0	0	1	0
Ending balance					$ 956
Multifamily \| Held for Investment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending balance	630	493	630	493
Multifamily \| Other Allowance for Credit Losses
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Ending balance	$ 220	$ 264	$ 220	$ 264

Financing receivable excluding accrued interest allowance for credit loss adjustments other

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
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-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

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