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Investments (Rollforward of expected credit-losses, AFS) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Debt Securities, Available for sale, Allowance for Credit Loss | $ 193 | $ 78 | $ 193 | $ 78 | $ 168 | $ 169 | $ 27 | $ 14
Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | 79 | 61 | 138 | 78 |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff | (2) | 0 | (4) | 0 |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss, Recovery | $ (52) | $ (10) | $ (110) | $ (14) |  |  |  |

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