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Mortgage Loans - Accrued Interest Receivable and Related Charge-Offs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued Interest Receivable	$ 11,813		$ 11,813		$ 11,029
Single family
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued Interest Receivable	10,376		10,376		9,776
Financing Receivable, Accrued Interest, Writeoff	(65)	$ (59)	(189)	$ (151)
Multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Accrued Interest Receivable	530		530		$ 431
Financing Receivable, Accrued Interest, Writeoff	$ 0	$ 0	$ (3)	$ (1)