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Investments - Commercial mortgage loans amortized cost by debt service coverage ratio distribution and year of acquisition (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Financing Receivable, Impaired [Line Items] |  |
Amortized cost, net | $ 4,655 | $ 4,817

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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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Period Type: | duration

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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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