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Investments - Investments - Commercial Mortgage Loans Credit Quality (Details) $ in Millions | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 3,559 | $ 3,175
Commercial Loan [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 3,559 | $ 3,175
Avg. Debt-Service Coverage Ratio | 2.50 | 2.69
Commercial Loan [Member] | Greater than 80% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 0 | $ 18
Avg. Debt-Service Coverage Ratio | 0.00 | 1.27
Commercial Loan [Member] | 65% - 80% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 406 | $ 265
Avg. Debt-Service Coverage Ratio | 1.68 | 1.95
Commercial Loan [Member] | Less than 65% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 3,153 | $ 2,892
Avg. Debt-Service Coverage Ratio | 2.60 | 2.76

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- Definition Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column G)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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