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Investments Investments (Rollforward of expected credit losses HTM) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | $ 45 | $ 45 | $ 51 |  | $ 0
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Period Increase (Decrease) | 2 | 9 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss, Recovery | $ (8) | $ (8) |  |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |  |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss |  |  |  | $ 44 |

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