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Investments (Mortgage Loans by Maturity Date) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 7,320 | $ 6,653
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% | 100.00%
Due within five years |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 3,150 | $ 2,652
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 42.90% | 39.90%
Due after five years through ten years |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 3,248 | $ 2,930
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 44.40% | 44.00%
Due after ten years |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 922 | $ 1,071
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 12.70% | 16.10%

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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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