Conservatorship, Senior Preferred Stock Purchase Agreement and Related Matters - Related Party (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Related Parties [Line Items]
TCCA fees	$ 859	$ 856	$ 1,719	$ 1,711
Other expenses, net	251	257	450	387
Other administrative expenses	225	205	442	409
Administrative expenses	939	864	1,868	1,732
Other liabilities	13,270		13,270		$ 14,106
Related Party | Treasury
Related Parties [Line Items]
TCCA fees	859	856	1,719	1,711
Related Party | Treasury | TCCA fees
Related Parties [Line Items]
TCCA fees	859	856	1,719	1,711
Other liabilities	859		859
Related Party | Treasury | Treasury’s Capital Magnet Fund
Related Parties [Line Items]
Other expenses, net	14	16	25	27
Other liabilities	25		25
Related Party | FHFA
Related Parties [Line Items]
Other administrative expenses	40	40	80	79
Other liabilities	0		0
Related Party | Treasury & Freddie Mac
Related Parties [Line Items]
Administrative expenses	0	3	0	6
Other liabilities	0		0
Related Party | CSS & Freddie Mac
Related Parties [Line Items]
Other expenses, net	16	$ 16	38	$ 42
Other liabilities	$ 0		$ 0