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Investments (Age Analysis of Past Due Recorded Investments) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Financing Receivable, Past Due [Line Items] |  |
Document Period End Date | Jun. 30, 2021 |
Loans Receivable, Gross, Commercial, Real Estate | $ 6,537 | $ 5,861
Commercial Real Estate Portfolio Segment [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 6,537 | 5,861
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 15 | 15
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 6,522 | $ 5,846

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