Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Mortgage servicing rights at fair value	$ 3,496	$ 3,665
Advances and other receivables, Reserves	175	47
Reverse mortgage interests, Reserves	3	13
Accumulated depreciation	$ 55	$ 16
Preferred stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Preferred stock, shares authorized (shares)	10,000,000	10,000,000
Preferred stock, shares issued (shares)	1,000,000	1,000,000
Preferred stock, shares outstanding (shares)	1,000,000	1,000,000
Liquidation preference (in dollars per share)	$ 10	$ 10
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	300,000,000	300,000,000
Common stock, shares issued (shares)	91,100,000	90,800,000