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Basis of Presentation and Significant Accounting Policies Additional Information (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Stockholders' Equity Attributable to Noncontrolling Interest | $ 60 | $ 60
Preferred Stock, Shares Issued | 0 |
Fixed Income Securities [Member] |  |
Derivative [Line Items] |  |
Accrued Investment Income Receivable | $ 10 |

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