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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Document Period End Date | Mar. 31, 2021 |  |  |
Recorded investment | $ 6,058 | $ 5,861 |  |
Valuation Allowances: |  |  |  |
Allowance for Loan and Lease Losses, Real Estate | 47 | 64 | $ 39 | $ 12
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Evaluated individually for credit losses | 36 | 37 |  |
Evaluated collectively for credit losses | 6,022 | 5,824 |  |
Recorded investment | 6,058 | 5,861 |  |
Valuation Allowances: |  |  |  |
Specific for credit losses | 0 | 0 |  |
Non-specifically identified credit losses | 47 | 64 |  |
Allowance for Loan and Lease Losses, Real Estate | $ 47 | $ 64 |  |

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