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Investments (Credit Quality Indicators For Residential Mortgage Loans) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Mortgage Loans Credit Quality [Line Items] |  |  |
Mortgage loans on real estate, ACL | $ 202 | $ 273 | $ 2
Residential [Member] |  |  |
Mortgage Loans Credit Quality [Line Items] |  |  |
Amortized Cost | $ 730 |  | $ 735
Percent of total | 100.00% |  | 100.00%
Mortgage loans on real estate, ACL | $ 30 | $ 37 | $ 2
Performing [Member] | Residential [Member] |  |  |
Mortgage Loans Credit Quality [Line Items] |  |  |
Amortized Cost | $ 648 |  | $ 718
Percent of total | 88.80% |  | 97.70%
Nonperforming [Member] | Residential [Member] |  |  |
Mortgage Loans Credit Quality [Line Items] |  |  |
Amortized Cost | $ 82 |  | $ 17
Percent of total | 11.20% |  | 2.30%

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