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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Document Period End Date | Sep. 30, 2020 |  |
Mortgage Loans: |  |  |
Total mortgage loans | $ 5,981 |  | $ 5,727
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract] |  |  |
Mortgage loans on real estate (net of valuation allowances) | 5,907 |  | 5,706
Commercial Real Estate Portfolio Segment [Member] |  |  |
Mortgage Loans: |  |  |
Evaluated individually for credit losses | 37 |  | 17
Evaluated collectively for credit losses | 5,944 |  | 5,710
Total mortgage loans | 5,981 |  | 5,727
Valuation Allowances: |  |  |
Specific for credit losses | 0 |  | 0
Non-specifically identified credit losses | 64 | $ 5,961 | 12
Total valuation allowances | $ 64 |  | $ 12

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