| **Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions** | Dec. 31, 2023 | Dec. 31, 2022 |
|----------------------------------------------------------------------------------------------------|---------------|---------------|
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | $ 3,483       | $ 25,234      |
| Gross Unrealized Losses, Less than 12 Months                                                       | 74            | 2,946         |
| Estimated Fair Value, 12 Months or Longer                                                          | 22,248        | 4,277         |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 2,921         | 1,110         |
| Estimated Fair Value, Total                                                                        | 25,731        | 29,511        |
| Gross Unrealized Losses, Total                                                                     | 2,995         | 4,056         |
| Corporate and other bonds                                                                          |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 1,943         | 15,946        |
| Gross Unrealized Losses, Less than 12 Months                                                       | 37            | 1,585         |
| Estimated Fair Value, 12 Months or Longer                                                          | 13,406        | 1,634         |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 1,308         | 424           |
| Estimated Fair Value, Total                                                                        | 15,349        | 17,580        |
| Gross Unrealized Losses, Total                                                                     | 1,345         | 2,009         |
| States, municipalities and political subdivisions                                                  |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 598           | 4,079         |
| Gross Unrealized Losses, Less than 12 Months                                                       | 18            | 769           |
| Estimated Fair Value, 12 Months or Longer                                                          | 3,104         | 456           |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 685           | 170           |
| Estimated Fair Value, Total                                                                        | 3,702         | 4,535         |
| Gross Unrealized Losses, Total                                                                     | 703           | 939           |
| Residential mortgage-backed                                                                        |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 233           | 1,406         |
| Gross Unrealized Losses, Less than 12 Months                                                       | 4             | 144           |
| Estimated Fair Value, 12 Months or Longer                                                          | 2,212         | 1,143         |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 421           | 303           |
| Estimated Fair Value, Total                                                                        | 2,445         | 2,549         |
| Gross Unrealized Losses, Total                                                                     | 425           | 447           |
| Commercial mortgage-backed                                                                         |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 200           | 1,167         |
| Gross Unrealized Losses, Less than 12 Months                                                       | 5             | 159           |
| Estimated Fair Value, 12 Months or Longer                                                          | 1,184         | 408           |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 225           | 96            |
| Estimated Fair Value, Total                                                                        | 1,384         | 1,575         |
| Gross Unrealized Losses, Total                                                                     | 230           | 255           |
| Other asset-backed                                                                                 |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 392           | 2,087         |
| Gross Unrealized Losses, Less than 12 Months                                                       | 8             | 262           |
| Estimated Fair Value, 12 Months or Longer                                                          | 1,869         | 542           |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 248           | 99            |
| Estimated Fair Value, Total                                                                        | 2,261         | 2,629         |
| Gross Unrealized Losses, Total                                                                     | 256           | 361           |
| Asset-backed                                                                                       |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 825           | 4,660         |
| Gross Unrealized Losses, Less than 12 Months                                                       | 17            | 565           |
| Estimated Fair Value, 12 Months or Longer                                                          | 5,265         | 2,093         |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 894           | 498           |
| Estimated Fair Value, Total                                                                        | 6,090         | 6,753         |
| Gross Unrealized Losses, Total                                                                     | 911           | 1,063         |
| U.S. Treasury and obligations of government-sponsored enterprises                                  |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 65            | 76            |
| Gross Unrealized Losses, Less than 12 Months                                                       | 1             | 1             |
| Estimated Fair Value, 12 Months or Longer                                                          | 23            | 16            |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 1             | 1             |
| Estimated Fair Value, Total                                                                        | 88            | 92            |
| Gross Unrealized Losses, Total                                                                     | 2             | 2             |
| Foreign government                                                                                 |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 52            | 473           |
| Gross Unrealized Losses, Less than 12 Months                                                       | 1             | 26            |
| Estimated Fair Value, 12 Months or Longer                                                          | 450           | 78            |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 33            | 17            |
| Estimated Fair Value, Total                                                                        | 502           | 551           |
| Gross Unrealized Losses, Total                                                                     | $ 34          | $ 43          |

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