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Investments, Debt and Equity Securities (Age Analysis of Past Due Recorded Investments) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | $ 15 | $ 0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 5,727
Loans Receivable, Gross, Commercial, Real Estate | 5,861 | 5,727
Commercial Real Estate Portfolio Segment |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 5,846 |
Financial Asset, 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, Past Due | $ 15 | $ 0

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