Consolidated Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Mortgage servicing rights at fair value	$ 3,481,000,000	$ 3,665,000,000
Advances and other receivables, Reserves	71,000,000	47,000,000
Reverse mortgage interests, Reserves	8,000,000	13,000,000
Accumulated depreciation	$ 27,000,000	$ 16,000,000
Preferred stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	1,000,000	1,000,000
Preferred stock, shares outstanding	1,000,000	1,000,000
Preferred stock, liquidation preference	$ 10	$ 10
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	91,000,000	90,800,000