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Investments (Credit Quality Indicators For Commercial Mortgage Loans) (Details) - Commercial [Member] $ in Millions | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 13,582 | $ 13,012
Percentage of total mortgage loans on real estate | 100.00% | 100.00%
Loan-to-value ratio, less than 65% [Member] |  |
Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 12,368 | $ 11,716
Percentage of total mortgage loans on real estate | 91.10% | 90.10%
Debt-service coverage ratio | 2.27 | 2.30
Loan-to-value ratio, 65% to 74% [Member] |  |
Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 1,175 | $ 1,238
Percentage of total mortgage loans on real estate | 8.60% | 9.50%
Debt-service coverage ratio | 1.74 | 1.76
Loan-to-value ratio, 75% to 100% [Member] |  |
Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 39 | $ 58
Percentage of total mortgage loans on real estate | 0.30% | 0.40%
Debt-service coverage ratio | 1.20 | 0.95

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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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