Conservatorship, Senior Preferred Stock Purchase Agreement and Related Matters - Related Party (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Related Parties [Line Items]
TCCA fees	$ 862	$ 860	$ 2,581	$ 2,571
Other expenses, net	270	535	720	922
Other administrative expenses	222	209	664	618
Administrative expenses	925	897	2,793	2,629
Other liabilities	14,797		14,797		$ 14,106
Related Party | Treasury
Related Parties [Line Items]
TCCA fees	862	860	2,581	2,571
Related Party | Treasury | TCCA fees
Related Parties [Line Items]
TCCA fees	862	860	2,581	2,571
Other liabilities	862		862
Related Party | Treasury | Treasury’s Capital Magnet Fund
Related Parties [Line Items]
Other expenses, net	15	15	40	42
Other liabilities	40		40
Related Party | FHFA
Related Parties [Line Items]
Other administrative expenses	41	39	121	118
Other liabilities	0		0
Related Party | Treasury & Freddie Mac
Related Parties [Line Items]
Administrative expenses	0	0	0	6
Other liabilities	0		0
Related Party | CSS & Freddie Mac
Related Parties [Line Items]
Other expenses, net	14	$ 13	52	$ 55
Other liabilities	$ 0		$ 0