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Reinsurance (Components of Earned Premiums) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Premiums Earned, Net [Abstract]      
Direct $ 15,025 $ 14,315 $ 13,524
Assumed 293 267 277
Ceded 5,107 5,102 5,134
Net 10,211 9,480 8,667
Property and casualty      
Premiums Earned, Net [Abstract]      
Direct 14,629 13,908 13,097
Assumed 252 223 231
Ceded 5,107 5,102 5,134
Net 9,774 9,029 8,194
Long-term care      
Premiums Earned, Net [Abstract]      
Direct 396 407 427
Assumed 41 44 46
Ceded 0 0 0
Net $ 437 $ 451 $ 473
Percentage of assumed premiums earned to net premiums earned      
Premiums Earned, Net [Abstract]      
Assumed/ Net % 2.90% 2.80% 3.20%
Percentage of assumed premiums earned to net premiums earned | Property and casualty      
Premiums Earned, Net [Abstract]      
Assumed/ Net % 2.60% 2.50% 2.80%
Percentage of assumed premiums earned to net premiums earned | Long-term care      
Premiums Earned, Net [Abstract]      
Assumed/ Net % 9.40% 9.80% 9.70%