Equity - Narrative (Details) $ / shares in Units, $ in Millions			12 Months Ended
	Sep. 08, 2008 USD ($) $ / shares	Sep. 08, 2008 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 07, 2008 $ / shares
Class of Stock [Line Items]
Common stock, shares outstanding | shares			1,158,087,567	1,158,087,567
Senior preferred stock dividends paid			$ 0	$ 0	$ 5,601
Liquidation preference			163,700
Proceeds from issuance of common stock			70,000
FHFA debt limit			300,000
Preferred stock, covenant, maximum mortgage assets				$ 250,000
Mortgage assets			$ 111,200
Accumulated Deficit
Class of Stock [Line Items]
Senior preferred stock dividends paid					$ 5,601
Convertible Series 2004-1
Class of Stock [Line Items]
Conversion price per share (in dollars per share) | $ / shares			$ 94.31
Conversion rate			1,060.3329
Preferred stock, redemption price (in dollars per share) | $ / shares			$ 105,000
Series 2008-2
Class of Stock [Line Items]
Shares of variable liquidation preference senior preferred stock issued | shares		1,000,000
Aggregate liquidation preference of senior preferred stock	$ 1,000	$ 1,000
Value assigned to Treasury's commitment and recorded as a reduction to additional paid-in-capital	$ 4,500
Senior preferred stock, stated value per share (in dollars per share) | $ / shares	$ 1,000	$ 1,000	$ 120,836
Preferred stock covenant maximum fair market value of assets and properties per transaction			$ 250
Preferred stock, covenant, maximum mortgage assets, ratio				120.00%
Minimum | Series O
Class of Stock [Line Items]
Preferred stock, redemption price (in dollars per share) | $ / shares			$ 50
Maximum | Series O
Class of Stock [Line Items]
Preferred stock, redemption price (in dollars per share) | $ / shares			$ 52.50
US Treasury
Class of Stock [Line Items]
Percentage of common shares attributable to warrants								79.90%
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement			$ 119,800
Common stock warrant exercise price (in dollars per share) | $ / shares								$ 0.00001
Total remaining funding available from US Treasury pursuant to the senior preferred stock agreement			113,900
Fannie Mae
Class of Stock [Line Items]
Face amount			$ 202,500	$ 290,000
Forecast
Class of Stock [Line Items]
Preferred stock, covenant, maximum mortgage assets						$ 225,000
Face amount						$ 270,000
Forecast | US Treasury
Class of Stock [Line Items]
Aggregate liquidation preference of senior preferred stock							$ 168,900