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Investments (Credit Quality Indicators For Residential Mortgage Loans) (Details) - Residential [Member] - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 739 | $ 248
Percentage of total mortgage loans on real estate | 100.00% | 100.00%
Performing [Member] |  |
Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 731 | $ 247
Percentage of total mortgage loans on real estate | 98.90% | 99.60%
Nonperforming [Member] |  |
Mortgage Loans Credit Quality [Line Items] |  |
Carrying value of mortgage loans on real estate | $ 8 | $ 1
Percentage of total mortgage loans on real estate | 1.10% | 0.40%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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