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Investments (Age Analysis of Past Due Recorded Investments) (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Financing Receivable, Past Due [Line Items] |  |  |
Document Period End Date | Sep. 30, 2020 |  |
Financing Receivable, Past Due | $ 20 |  | $ 0
Financing Receivable, Not Past Due |  |  | 5,727
Loans Receivable, Gross, Commercial, Real Estate | 5,981 |  | 5,727
Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 64 | $ 5,961 | 12
Loans Receivable, Gross, Commercial, Real Estate | 5,981 |  | 5,727
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | 20 |  | 0
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due |  |  | 0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due |  | $ 0 |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Financing Receivable, Past Due | $ 0 |  | $ 0

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