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Investments - Commercial Mortgage Loans Credit Quality (Details) $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 3,175 | $ 2,886
Commercial Loan |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 3,175 | $ 2,886
Avg. Debt-Service Coverage Ratio | 2.69 | 2.83
Commercial Loan | Greater than 80% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 18 | $ 0
Avg. Debt-Service Coverage Ratio | 1.27 | 0.00
Commercial Loan | 65% - 80% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 265 | $ 386
Avg. Debt-Service Coverage Ratio | 1.95 | 2.16
Commercial Loan | Less than 65% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 2,892 | $ 2,500
Avg. Debt-Service Coverage Ratio | 2.76 | 2.95

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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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