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Investments (Credit Quality Indicators For Mortgage Loans) (Details) $ in Millions | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 12,561 | $ 10,762
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 | $ 11,297 | $ 9,642
Percentage of total mortgage loans on real estate | 89.90% | 89.60%
Debt-service coverage ratio | 2.30 | 2.26
Loan-to-value ratio, 65% to 74% [Member] |  |
Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 1,187 | $ 1,000
Percentage of total mortgage loans on real estate | 9.50% | 9.30%
Debt-service coverage ratio | 1.79 | 1.94
Loan-to-value ratio, 75% to 100% [Member] |  |
Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 74 | $ 112
Percentage of total mortgage loans on real estate | 0.60% | 1.00%
Debt-service coverage ratio | 0.95 | 0.97
Loan-To-Value Ratio, Greater Than 100% [Member] |  |
Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 3 | $ 8
Percentage of total mortgage loans on real estate | 0.00% | 0.10%
Debt-service coverage ratio | 0.21 | 0.82

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- Definition Reflects the percentage derived from dividing mortgage loans with a specified loan-to-value ratio by total principal amount of mortgage loans. + References No definition available. + Details
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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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