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Reinsurance (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance      
Gross amounts, life insurance in force $ 124,145 $ 122,053 $ 120,147
Gross amounts 8,742 7,801 7,056
Ceded amounts to other companies, life insurance in force 39,900 39,692 39,665
Ceded premiums earned 495 412 392
Assumed amounts from other companies, life insurance in force 0 0 0
Assumed amounts from other companies 642 569 561
Net amounts, life insurance in force 84,245 82,361 80,482
Premiums Earned, Net $ 8,889 $ 7,958 $ 7,225
Percentage of amounts assumed to net, life insurance in force 0.00% 0.00% 0.00%
Percentage of amounts assumed to net 7.20% 7.20% 7.80%
Commercial Insurance      
SEC Schedule, 12-17, Insurance Companies, Reinsurance      
Gross amounts $ 4,638 $ 4,399 $ 4,150
Ceded premiums earned 162 147 137
Assumed amounts from other companies 10 12 11
Premiums Earned, Net $ 4,486 $ 4,264 $ 4,024
Percentage of amounts assumed to net 0.20% 0.30% 0.30%
Personal Insurance      
SEC Schedule, 12-17, Insurance Companies, Reinsurance      
Gross amounts $ 2,724 $ 2,117 $ 1,755
Ceded premiums earned 102 74 67
Assumed amounts from other companies 1 1 1
Premiums Earned, Net $ 2,623 $ 2,044 $ 1,689
Percentage of amounts assumed to net 0.00% 0.00% 0.10%
Excess and Surplus Lines Insurance      
SEC Schedule, 12-17, Insurance Companies, Reinsurance      
Gross amounts $ 652 $ 572 $ 510
Ceded premiums earned 37 30 25
Assumed amounts from other companies 0 0 0
Premiums Earned, Net $ 615 $ 542 $ 485
Percentage of amounts assumed to net 0.00% 0.00% 0.00%
Reinsurance assumed and other non segment      
SEC Schedule, 12-17, Insurance Companies, Reinsurance      
Gross amounts $ 324 $ 319 $ 262
Ceded premiums earned 111 80 85
Assumed amounts from other companies 631 556 549
Premiums Earned, Net $ 844 $ 795 $ 726
Percentage of amounts assumed to net 74.80% 69.90% 75.60%
Property, Liability and Casualty Insurance      
SEC Schedule, 12-17, Insurance Companies, Reinsurance      
Gross amounts $ 8,338 $ 7,407 $ 6,677
Ceded premiums earned 412 331 314
Assumed amounts from other companies 642 569 561
Premiums Earned, Net $ 8,568 $ 7,645 $ 6,924
Percentage of amounts assumed to net 7.50% 7.40% 8.10%
Life Insurance Segment      
SEC Schedule, 12-17, Insurance Companies, Reinsurance      
Gross amounts $ 404 $ 394 $ 379
Ceded premiums earned 83 81 78
Assumed amounts from other companies 0 0 0
Premiums Earned, Net $ 321 $ 313 $ 301
Percentage of amounts assumed to net 0.00% 0.00% 0.00%