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Investments (Credit Quality Indicators For Commercial Mortgage Loans) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Commercial [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 16,152 | $ 15,606
Percent of total | 100.00% | 100.00%
Loan-to-value ratio, less than 65% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 14,723 | $ 14,206
Percent of total | 91.20% | 91.00%
Debt-service coverage ratio | 2.40 | 2.35
Loan-to-value ratio, less than 65% [Member] | Commercial [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 14,723 |
Loan-to-value ratio, 65% to 74% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 1,428 | $ 1,399
Percent of total | 8.80% | 9.00%
Debt-service coverage ratio | 1.85 | 1.87
Loan-to-value ratio, 65% to 74% [Member] | Commercial [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 1,428 |
Loan-to-value ratio, 75% to 100% [Member] | Commercial [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 1 | $ 1
Percent of total | 0.00% | 0.00%
Debt-service coverage ratio | 0.90 | 1.09

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- Definition Ratio that compares a property's net operating income to its debt-service payments. + 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 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 Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 + Details
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- Details
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- Details
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- Details
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- Details
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