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Investments (Financing Receivables Past Due) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 6,058 | $ 5,861
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 6,043 | 5,846
Financial Asset, 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 15 | $ 15

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