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Business Combination - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Aug. 31, 2016 | Dec. 31, 2016
Business Acquisition [Line Items] |  |
Proceeds from sale of mortgaged based securities | $ 1,100,000,000 |
Apollo Residential Mortgage, Inc. Merger [Member] |  |
Business Acquisition [Line Items] |  |
Transaction-related expenses |  | $ 11,350,000
Loans Payable [Member] |  |
Business Acquisition [Line Items] |  |
Repayments of debt | 804,000,000 |
Loans Payable [Member] | Athene Loan Agreement [Member] |  |
Business Acquisition [Line Items] |  |
Principal amount | 175,000,000 |
Repayments of debt | $ 175,000,000 |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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- Definition The cash inflow from the sale of securities issued by a governmental agency or corporation (for example, GNMA or FHLMC) or by private issuers (for example, banks and mortgage banking enterprises) secured by and repaid from underlying mortgages, which were designated as available for sale when acquired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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