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Consolidated Balance Sheets (Parenthetical) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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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

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