| **Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions** | Sep. 30, 2024 | Dec. 31, 2023 |
|----------------------------------------------------------------------------------------------------|---------------|---------------|
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | $ 2,623       | $ 3,483       |
| Gross Unrealized Losses, Less than 12 Months                                                       | 47            | 74            |
| Estimated Fair Value, 12 Months or Longer                                                          | 19,777        | 22,248        |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 2,189         | 2,921         |
| Estimated Fair Value, Total                                                                        | 22,400        | 25,731        |
| Gross Unrealized Losses, Total                                                                     | 2,236         | 2,995         |
| Corporate and other bonds                                                                          |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 1,664         | 1,943         |
| Gross Unrealized Losses, Less than 12 Months                                                       | 31            | 37            |
| Estimated Fair Value, 12 Months or Longer                                                          | 11,240        | 13,406        |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 869           | 1,308         |
| Estimated Fair Value, Total                                                                        | 12,904        | 15,349        |
| Gross Unrealized Losses, Total                                                                     | 900           | 1,345         |
| States, municipalities and political subdivisions                                                  |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 422           | 598           |
| Gross Unrealized Losses, Less than 12 Months                                                       | 7             | 18            |
| Estimated Fair Value, 12 Months or Longer                                                          | 3,155         | 3,104         |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 610           | 685           |
| Estimated Fair Value, Total                                                                        | 3,577         | 3,702         |
| Gross Unrealized Losses, Total                                                                     | 617           | 703           |
| Residential mortgage-backed                                                                        |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 130           | 233           |
| Gross Unrealized Losses, Less than 12 Months                                                       | 2             | 4             |
| Estimated Fair Value, 12 Months or Longer                                                          | 2,162         | 2,212         |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 360           | 421           |
| Estimated Fair Value, Total                                                                        | 2,292         | 2,445         |
| Gross Unrealized Losses, Total                                                                     | 362           | 425           |
| Commercial mortgage-backed                                                                         |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 112           | 200           |
| Gross Unrealized Losses, Less than 12 Months                                                       | 0             | 5             |
| Estimated Fair Value, 12 Months or Longer                                                          | 1,134         | 1,184         |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 141           | 225           |
| Estimated Fair Value, Total                                                                        | 1,246         | 1,384         |
| Gross Unrealized Losses, Total                                                                     | 141           | 230           |
| Other asset-backed                                                                                 |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 151           | 392           |
| Gross Unrealized Losses, Less than 12 Months                                                       | 4             | 8             |
| Estimated Fair Value, 12 Months or Longer                                                          | 1,638         | 1,869         |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 182           | 248           |
| Estimated Fair Value, Total                                                                        | 1,789         | 2,261         |
| Gross Unrealized Losses, Total                                                                     | 186           | 256           |
| Asset-backed                                                                                       |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 393           | 825           |
| Gross Unrealized Losses, Less than 12 Months                                                       | 6             | 17            |
| Estimated Fair Value, 12 Months or Longer                                                          | 4,934         | 5,265         |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 683           | 894           |
| Estimated Fair Value, Total                                                                        | 5,327         | 6,090         |
| Gross Unrealized Losses, Total                                                                     | 689           | 911           |
| U.S. Treasury and obligations of government-sponsored enterprises                                  |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 45            | 65            |
| Gross Unrealized Losses, Less than 12 Months                                                       | 2             | 1             |
| Estimated Fair Value, 12 Months or Longer                                                          | 45            | 23            |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 2             | 1             |
| Estimated Fair Value, Total                                                                        | 90            | 88            |
| Gross Unrealized Losses, Total                                                                     | 4             | 2             |
| Foreign government                                                                                 |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 99            | 52            |
| Gross Unrealized Losses, Less than 12 Months                                                       | 1             | 1             |
| Estimated Fair Value, 12 Months or Longer                                                          | 403           | 450           |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 25            | 33            |
| Estimated Fair Value, Total                                                                        | 502           | 502           |
| Gross Unrealized Losses, Total                                                                     | $ 26          | $ 34          |

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