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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Document Period End Date | Jun. 30, 2021 |
Mortgage Loans: |  |
Total mortgage loans | $ 6,537 | $ 5,861
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract] |  |
Mortgage loans on real estate (net of valuation allowances) | 6,481 | 5,787
Commercial Real Estate Portfolio Segment [Member] |  |
Mortgage Loans: |  |
Evaluated individually for credit losses | 36 | 37
Evaluated collectively for credit losses | 6,501 | 5,824
Total mortgage loans | 6,537 | 5,861
Valuation Allowances: |  |
Specific for credit losses | 0 | 0
Non-specifically identified credit losses | 45 | 64
Total valuation allowances | $ 45 | $ 64

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