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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Mortgage Loans [Abstract] |  |  |  |
Financing Receivable, Individually Evaluated for Impairment | $ 37 | $ 17 |  |
Financing Receivable, Collectively Evaluated for Impairment | 5,824 | 5,710 |  |
Loans Receivable, Gross, Commercial, Real Estate | 5,861 | 5,727 |  |
Valuation Allowances [Abstract] |  |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment | 64 | 12 |  |
Allowance for Loan and Lease Losses, Real Estate | $ 64 | $ 12 | $ 11 | $ 9

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121581245&loc=d3e21338-158488 + Details
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