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Investments (Credit Quality Indicators For Commercial Mortgage Loans) (Details) - Commercial [Member] - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 15,986 | $ 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 | $ 14,679 | $ 14,206
Percent of total | 91.80% | 91.00%
Debt-service coverage ratio | 2.43 | 2.35
Loan-to-value ratio, 65% to 74% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 1,271 | $ 1,399
Percent of total | 8.00% | 9.00%
Debt-service coverage ratio | 1.82 | 1.87
Loan-to-value ratio, 75% to 100% [Member] |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 36 | $ 1
Percent of total | 0.20% | 0.00%
Debt-service coverage ratio | 1.24 | 1.09

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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, 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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