|**Fair Value (Assets and liabilities measured at fair value on a recurring basis) (Details) - USD ($) $ in Millions**                                                                                                                                                                                                                                                | Sep. 30, 2023                                                                                                                                                                                                                                                                                                                                                    | Dec. 31, 2022                                                                                                                                                                                                                                                                                                                                                   
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | $ 37,856                                                                                                                                                                                                                                                                                                                                                         | $ 37,627                                                                                                                                                                                                                                                                                                                                                        
|**Equity securities:**                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Equity securities                                                                                                                                                                                                                                                                                                                                                    | 692                                                                                                                                                                                                                                                                                                                                                              | 674                                                                                                                                                                                                                                                                                                                                                             
|Short term and other                                                                                                                                                                                                                                                                                                                                                 | 1,791                                                                                                                                                                                                                                                                                                                                                            | 1,679                                                                                                                                                                                                                                                                                                                                                           
|Total assets                                                                                                                                                                                                                                                                                                                                                         | 40,339                                                                                                                                                                                                                                                                                                                                                           | 39,980                                                                                                                                                                                                                                                                                                                                                          
|Other liabilities                                                                                                                                                                                                                                                                                                                                                    | 1                                                                                                                                                                                                                                                                                                                                                                | 1                                                                                                                                                                                                                                                                                                                                                               
|Total liabilities                                                                                                                                                                                                                                                                                                                                                    | 1                                                                                                                                                                                                                                                                                                                                                                | 1                                                                                                                                                                                                                                                                                                                                                               
|Corporate and other bonds                                                                                                                                                                                                                                                                                                                                            |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 23,320                                                                                                                                                                                                                                                                                                                                                           | 22,117                                                                                                                                                                                                                                                                                                                                                          
|States, municipalities and political subdivisions                                                                                                                                                                                                                                                                                                                    |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 7,034                                                                                                                                                                                                                                                                                                                                                            | 8,317                                                                                                                                                                                                                                                                                                                                                           
|Asset-backed                                                                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 7,502                                                                                                                                                                                                                                                                                                                                                            | 7,193                                                                                                                                                                                                                                                                                                                                                           
|Common Stock                                                                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Equity securities:**                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Equity securities                                                                                                                                                                                                                                                                                                                                                    | 213                                                                                                                                                                                                                                                                                                                                                              | 185                                                                                                                                                                                                                                                                                                                                                             
|Non-redeemable preferred stock                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Equity securities:**                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Equity securities                                                                                                                                                                                                                                                                                                                                                    | 479                                                                                                                                                                                                                                                                                                                                                              | 489                                                                                                                                                                                                                                                                                                                                                             
|Level 1                                                                                                                                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 159                                                                                                                                                                                                                                                                                                                                                              | 120                                                                                                                                                                                                                                                                                                                                                             
|**Equity securities:**                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Equity securities                                                                                                                                                                                                                                                                                                                                                    | 242                                                                                                                                                                                                                                                                                                                                                              | 204                                                                                                                                                                                                                                                                                                                                                             
|Short term and other                                                                                                                                                                                                                                                                                                                                                 | 1,756                                                                                                                                                                                                                                                                                                                                                            | 1,608                                                                                                                                                                                                                                                                                                                                                           
|Total assets                                                                                                                                                                                                                                                                                                                                                         | 2,157                                                                                                                                                                                                                                                                                                                                                            | 1,932                                                                                                                                                                                                                                                                                                                                                           
|Other liabilities                                                                                                                                                                                                                                                                                                                                                    | 0                                                                                                                                                                                                                                                                                                                                                                | 0                                                                                                                                                                                                                                                                                                                                                               
|Total liabilities                                                                                                                                                                                                                                                                                                                                                    | 0                                                                                                                                                                                                                                                                                                                                                                | 0                                                                                                                                                                                                                                                                                                                                                               
|Level 1 | Corporate and other bonds                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 159                                                                                                                                                                                                                                                                                                                                                              | 120                                                                                                                                                                                                                                                                                                                                                             
|Level 1 | States, municipalities and political subdivisions                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 0                                                                                                                                                                                                                                                                                                                                                                | 0                                                                                                                                                                                                                                                                                                                                                               
|Level 1 | Asset-backed                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 0                                                                                                                                                                                                                                                                                                                                                                | 0                                                                                                                                                                                                                                                                                                                                                               
|Level 1 | Common Stock                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Equity securities:**                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Equity securities                                                                                                                                                                                                                                                                                                                                                    | 190                                                                                                                                                                                                                                                                                                                                                              | 150                                                                                                                                                                                                                                                                                                                                                             
|Level 1 | Non-redeemable preferred stock                                                                                                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Equity securities:**                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Equity securities                                                                                                                                                                                                                                                                                                                                                    | 52                                                                                                                                                                                                                                                                                                                                                               | 54                                                                                                                                                                                                                                                                                                                                                              
|Level 2                                                                                                                                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 35,814                                                                                                                                                                                                                                                                                                                                                           | 35,866                                                                                                                                                                                                                                                                                                                                                          
|**Equity securities:**                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Equity securities                                                                                                                                                                                                                                                                                                                                                    | 427                                                                                                                                                                                                                                                                                                                                                              | 435                                                                                                                                                                                                                                                                                                                                                             
|Short term and other                                                                                                                                                                                                                                                                                                                                                 | 35                                                                                                                                                                                                                                                                                                                                                               | 71                                                                                                                                                                                                                                                                                                                                                              
|Total assets                                                                                                                                                                                                                                                                                                                                                         | 36,276                                                                                                                                                                                                                                                                                                                                                           | 36,372                                                                                                                                                                                                                                                                                                                                                          
|Other liabilities                                                                                                                                                                                                                                                                                                                                                    | 1                                                                                                                                                                                                                                                                                                                                                                | 1                                                                                                                                                                                                                                                                                                                                                               
|Total liabilities                                                                                                                                                                                                                                                                                                                                                    | 1                                                                                                                                                                                                                                                                                                                                                                | 1                                                                                                                                                                                                                                                                                                                                                               
|Level 2 | Corporate and other bonds                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 22,216                                                                                                                                                                                                                                                                                                                                                           | 21,187                                                                                                                                                                                                                                                                                                                                                          
|Level 2 | States, municipalities and political subdivisions                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 6,993                                                                                                                                                                                                                                                                                                                                                            | 8,274                                                                                                                                                                                                                                                                                                                                                           
|Level 2 | Asset-backed                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 6,605                                                                                                                                                                                                                                                                                                                                                            | 6,405                                                                                                                                                                                                                                                                                                                                                           
|Level 2 | Common Stock                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Equity securities:**                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Equity securities                                                                                                                                                                                                                                                                                                                                                    | 0                                                                                                                                                                                                                                                                                                                                                                | 0                                                                                                                                                                                                                                                                                                                                                               
|Level 2 | Non-redeemable preferred stock                                                                                                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Equity securities:**                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Equity securities                                                                                                                                                                                                                                                                                                                                                    | 427                                                                                                                                                                                                                                                                                                                                                              | 435                                                                                                                                                                                                                                                                                                                                                             
|Level 3                                                                                                                                                                                                                                                                                                                                                              |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 1,883                                                                                                                                                                                                                                                                                                                                                            | 1,641                                                                                                                                                                                                                                                                                                                                                           
|**Equity securities:**                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Equity securities                                                                                                                                                                                                                                                                                                                                                    | 23                                                                                                                                                                                                                                                                                                                                                               | 35                                                                                                                                                                                                                                                                                                                                                              
|Short term and other                                                                                                                                                                                                                                                                                                                                                 | 0                                                                                                                                                                                                                                                                                                                                                                | 0                                                                                                                                                                                                                                                                                                                                                               
|Total assets                                                                                                                                                                                                                                                                                                                                                         | 1,906                                                                                                                                                                                                                                                                                                                                                            | 1,676                                                                                                                                                                                                                                                                                                                                                           
|Other liabilities                                                                                                                                                                                                                                                                                                                                                    | 0                                                                                                                                                                                                                                                                                                                                                                | 0                                                                                                                                                                                                                                                                                                                                                               
|Total liabilities                                                                                                                                                                                                                                                                                                                                                    | 0                                                                                                                                                                                                                                                                                                                                                                | 0                                                                                                                                                                                                                                                                                                                                                               
|Level 3 | Corporate and other bonds                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 945                                                                                                                                                                                                                                                                                                                                                              | 810                                                                                                                                                                                                                                                                                                                                                             
|Level 3 | States, municipalities and political subdivisions                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 41                                                                                                                                                                                                                                                                                                                                                               | 43                                                                                                                                                                                                                                                                                                                                                              
|Level 3 | Asset-backed                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Fixed maturity securities:**                                                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Fixed maturity securities                                                                                                                                                                                                                                                                                                                                            | 897                                                                                                                                                                                                                                                                                                                                                              | 788                                                                                                                                                                                                                                                                                                                                                             
|Level 3 | Common Stock                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Equity securities:**                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Equity securities                                                                                                                                                                                                                                                                                                                                                    | 23                                                                                                                                                                                                                                                                                                                                                               | 35                                                                                                                                                                                                                                                                                                                                                              
|Level 3 | Non-redeemable preferred stock                                                                                                                                                                                                                                                                                                                             |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|**Equity securities:**                                                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                 
|Equity securities                                                                                                                                                                                                                                                                                                                                                    | $ 0                                                                                                                                                                                                                                                                                                                                                              | $ 0                                                                                                                                                                                                                                                                                                                                                             
|                                                                                                                                                                                                                                                                                                                                                                    
|[1]
As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021.  Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance.  See Note A to the Condensed Consolidated Financial Statements for additional information. | [1]                                                                                                                                                                                                                                                                                                                                                              | As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021.  Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance.  See Note A to the Condensed Consolidated Financial Statements for additional information.
|[1]                                                                                                                                                                                                                                                                                                                                                                  | As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021.  Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance.  See Note A to the Condensed Consolidated Financial Statements for additional information.

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