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Investments, Debt and Equity Securities (Age Analysis of Past Due Recorded Investments) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Financing Receivable, Past Due [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 7,459 | $ 6,653
Financial Asset, Not Past Due | Commercial Real Estate Portfolio Segment |  |
Financing Receivable, Past Due [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 7,431 | 6,617
Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 36
Financial Asset, 30 to 59 Days Past Due | Commercial Real Estate Portfolio Segment |  |
Financing Receivable, Past Due [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 28 | $ 0

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