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Investments (Mortgage Loans by Maturity Date) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 5,861 | $ 5,727
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% | 100.00%
Mortgage Loans On Real Estate Due One Year Through Five Years [Member] |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,276 | $ 1,841
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 38.80% | 32.20%
Mortgage Loans On Real Estate Due After Five Years [Member] |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,768 | $ 2,944
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 47.30% | 51.40%
Mortgage Loans On Real Estate Due After Ten Years [Member] |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 817 | $ 942
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 13.90% | 16.40%

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- Definition The amount represents the total percentage of each property type in comparison to the total of mortgage loans whose 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 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: 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=121599337&loc=SL82919230-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 + Details
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