Summary of Significant Accounting Policies (Details) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended	12 Months Ended
	Sep. 08, 2008 USD ($) shares	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) segment shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Mar. 31, 2022 USD ($)	Jan. 01, 2020 USD ($)	Sep. 07, 2008 $ / shares
Related Parties [Line Items]
Number of reportable segments | segment				2
Proceeds from issuance of common stock				$ 70,000
Liquidation preference		$ 163,700		163,700
Increase in net worth		$ 5,200
Proceeds from income tax refunds				27
TCCA fees				$ 3,071	$ 2,673	$ 2,432
Basis points of each dollar of unpaid principal balance		0.042%		0.042%
Affordable Housing Program obligation		35.00%		35.00%
Early lender funding advances, maximum term				60 days
Weighted average number of shares, contingently issuable (in shares) | shares				4,700	4,700	4,600
Incremental common shares attributable to dilutive effect of conversion of preferred stock (in shares) | shares				26	26	131
Accumulated deficit		$ (85,934)		$ (85,934)	$ (108,110)
ASU 2016-13
Related Parties [Line Items]
Accumulated deficit								$ (1,100)
US Treasury and Government
Related Parties [Line Items]
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement		119,800		119,800
US Treasury
Related Parties [Line Items]
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement		119,800		119,800
Total available funding from treasury pursuant to the senior preferred stock agreement		$ 113,900		113,900
Percentage of common shares attributable to warrants									79.90%
Common stock warrant exercise price (in dollars per share) | $ / shares									$ 0.00001
Fair value of the warrant at issuance	$ 3,500
Home Affordable Modification Program administrative expense reimbursement				$ 17	19	$ 20
TCCA, increase of guarantee fee rate		0.10%		0.10%
TCCA fees				$ 3,071	2,673	2,432
US Treasury | Other Expense
Related Parties [Line Items]
Affordable Housing Program assessments				209	211	98
Affordable Housing Program assessments paid				211	98
US Treasury | Single-Family
Related Parties [Line Items]
Recognized TCCA fees that had not been remitted to Treasury as of period end		$ 801		801	697
Federal Housing Finance Agency
Related Parties [Line Items]
FHFA assessment fees/expense				140	139	121
Common Securitization Solutions
Related Parties [Line Items]
Payments to acquire equity method investments				$ 76	$ 88	$ 105
Forecast | US Treasury
Related Parties [Line Items]
Aggregate liquidation preference of senior preferred stock							$ 168,900
Forecast | US Treasury | Other Expense
Related Parties [Line Items]
Affordable Housing Program assessments			$ 209
Series 2008-2
Related Parties [Line Items]
Stock issued (in shares) | shares	1
Aggregate liquidation preference of senior preferred stock	$ 1,000