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Mortgage Loans - Accrued Interest Receivable and Related Charge-Offs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued Interest Receivable	$ 11,583		$ 11,583		$ 11,029
Single family
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued Interest Receivable	10,154		10,154		9,776
Financing Receivable, Accrued Interest, Writeoff	(60)	$ (46)	(124)	$ (92)
Multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued Interest Receivable	431		431		$ 431
Financing Receivable, Accrued Interest, Writeoff	$ 0	$ 0	$ (3)	$ (1)