Conservatorship, Senior Preferred Stock Purchase Agreement and Related Matters - Related Party (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Related Parties [Line Items]
TCCA fees	$ 860	$ 855
Other expenses, net	199	130
Other administrative expenses	217	204
Administrative expenses	929	868
Other liabilities	14,118		$ 14,106
Related Party | Treasury
Related Parties [Line Items]
TCCA fees	860	855
Related Party | Treasury | TCCA fees
Related Parties [Line Items]
TCCA fees	860	855
Other liabilities	860
Related Party | Treasury | Treasury’s Capital Magnet Fund
Related Parties [Line Items]
Other expenses, net	11	11
Other liabilities	11
Related Party | FHFA
Related Parties [Line Items]
Other administrative expenses	40	39
Other liabilities	0
Related Party | Treasury & Freddie Mac
Related Parties [Line Items]
Administrative expenses	0	3
Other liabilities	0
Related Party | CSS & Freddie Mac
Related Parties [Line Items]
Other expenses, net	22	$ 26
Other liabilities	$ 0