| **Investments (Securities in a gross unrealized loss position) (Details) - USD ($) $ in Millions** | Jun. 30, 2023 | Dec. 31, 2022 |
|----------------------------------------------------------------------------------------------------|---------------|---------------|
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | $ 11,350      | $ 25,234      |
| Gross Unrealized Losses, Less than 12 Months                                                       | 506           | 2,946         |
| Estimated Fair Value, 12 Months or Longer                                                          | 18,262        | 4,277         |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 3,280         | 1,110         |
| Estimated Fair Value, Total                                                                        | 29,612        | 29,511        |
| Gross Unrealized Losses, Total                                                                     | 3,786         | 4,056         |
| Corporate and other bonds                                                                          |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 7,681         | 15,946        |
| Gross Unrealized Losses, Less than 12 Months                                                       | 350           | 1,585         |
| Estimated Fair Value, 12 Months or Longer                                                          | 10,087        | 1,634         |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 1,559         | 424           |
| Estimated Fair Value, Total                                                                        | 17,768        | 17,580        |
| Gross Unrealized Losses, Total                                                                     | 1,909         | 2,009         |
| States, municipalities and political subdivisions                                                  |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 1,486         | 4,079         |
| Gross Unrealized Losses, Less than 12 Months                                                       | 64            | 769           |
| Estimated Fair Value, 12 Months or Longer                                                          | 2,783         | 456           |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 729           | 170           |
| Estimated Fair Value, Total                                                                        | 4,269         | 4,535         |
| Gross Unrealized Losses, Total                                                                     | 793           | 939           |
| Asset-backed                                                                                       |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 1,886         | 4,660         |
| Gross Unrealized Losses, Less than 12 Months                                                       | 82            | 565           |
| Estimated Fair Value, 12 Months or Longer                                                          | 4,963         | 2,093         |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 949           | 498           |
| Estimated Fair Value, Total                                                                        | 6,849         | 6,753         |
| Gross Unrealized Losses, Total                                                                     | 1,031         | 1,063         |
| Residential mortgage-backed                                                                        |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 822           | 1,406         |
| Gross Unrealized Losses, Less than 12 Months                                                       | 35            | 144           |
| Estimated Fair Value, 12 Months or Longer                                                          | 1,810         | 1,143         |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 409           | 303           |
| Estimated Fair Value, Total                                                                        | 2,632         | 2,549         |
| Gross Unrealized Losses, Total                                                                     | 444           | 447           |
| Commercial mortgage-backed                                                                         |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 325           | 1,167         |
| Gross Unrealized Losses, Less than 12 Months                                                       | 15            | 159           |
| Estimated Fair Value, 12 Months or Longer                                                          | 1,171         | 408           |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 242           | 96            |
| Estimated Fair Value, Total                                                                        | 1,496         | 1,575         |
| Gross Unrealized Losses, Total                                                                     | 257           | 255           |
| Other asset-backed                                                                                 |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 739           | 2,087         |
| Gross Unrealized Losses, Less than 12 Months                                                       | 32            | 262           |
| Estimated Fair Value, 12 Months or Longer                                                          | 1,982         | 542           |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 298           | 99            |
| Estimated Fair Value, Total                                                                        | 2,721         | 2,629         |
| Gross Unrealized Losses, Total                                                                     | 330           | 361           |
| U.S. Treasury and obligations of government-sponsored enterprises                                  |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 84            | 76            |
| Gross Unrealized Losses, Less than 12 Months                                                       | 2             | 1             |
| Estimated Fair Value, 12 Months or Longer                                                          | 34            | 16            |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 1             | 1             |
| Estimated Fair Value, Total                                                                        | 118           | 92            |
| Gross Unrealized Losses, Total                                                                     | 3             | 2             |
| Foreign government                                                                                 |          |          |
| **Debt Securities, Available-for-sale [Line Items]**                                               |          |          |
| Estimated Fair Value, Less than 12 months                                                          | 213           | 473           |
| Gross Unrealized Losses, Less than 12 Months                                                       | 8             | 26            |
| Estimated Fair Value, 12 Months or Longer                                                          | 395           | 78            |
| Gross Unrealized Losses, 12 Months or Longer                                                       | 42            | 17            |
| Estimated Fair Value, Total                                                                        | 608           | 551           |
| Gross Unrealized Losses, Total                                                                     | $ 50          | $ 43          |

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.
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