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Segment Information (Segment Income (Loss) Before Income Taxes) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
industry
segment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Segment Income before Income Tax      
Earned premiums $ 8,889 $ 7,958 $ 7,225
Fee revenues 17 21 14
Investment income, net of expenses 1,025 894 781
Total revenues 11,337 10,013 6,563
Insurance losses and contract holders' benefits 5,737 5,274 5,019
Investment Interest Credited to Contract Holders 733 600 510
Underwriting, acquisition and insurance expenses $ 2,657 2,384 2,162
Number of Industries Operated In | industry 2    
Number of Insurance Segments | segment 4    
Life Insurance Segment      
Segment Income before Income Tax      
Earned premiums $ 321 313 301
Insurance losses and contract holders' benefits 301 316 303
Operating Segments      
Segment Income before Income Tax      
Total revenues 10,478 9,205 5,827
Operating Segments | Commercial Insurance      
Segment Income before Income Tax      
Earned premiums 4,486 4,264 4,024
Fee revenues 4 4 4
Total revenues 4,490 4,268 4,028
Insurance losses and contract holders' benefits 2,795 2,787 2,761
Underwriting, acquisition and insurance expenses 1,384 1,313 1,229
Income (loss) before income taxes 311 168 38
Operating Segments | Personal Insurance      
Segment Income before Income Tax      
Earned premiums 2,623 2,044 1,689
Fee revenues 5 4 4
Total revenues 2,628 2,048 1,693
Insurance losses and contract holders' benefits 1,795 1,442 1,166
Underwriting, acquisition and insurance expenses 762 610 509
Income (loss) before income taxes 71 (4) 18
Operating Segments | Excess and Surplus Lines Insurance      
Segment Income before Income Tax      
Earned premiums 615 542 485
Fee revenues 3 3 2
Total revenues 618 545 487
Insurance losses and contract holders' benefits 411 350 315
Underwriting, acquisition and insurance expenses 167 141 124
Income (loss) before income taxes 40 54 48
Operating Segments | Life Insurance Segment      
Segment Income before Income Tax      
Earned premiums 321 313 301
Fee revenues 5 10 4
Total revenues 326 323 305
Insurance losses and contract holders' benefits 301 316 303
Investment Interest Credited to Contract Holders (125) (121) (109)
Underwriting, acquisition and insurance expenses 93 87 84
Income (loss) before income taxes 57 41 27
Operating Segments | Investments Segment      
Segment Income before Income Tax      
Investment income, net of expenses 1,025 894 781
Investment gains and losses, net 1,391 1,127 (1,467)
Total revenues 2,416 2,021 (686)
Investment Interest Credited to Contract Holders 125 121 109
Income (loss) before income taxes 2,291 1,900 (795)
Segment Reporting, Reconciling Item, Corporate Nonsegment      
Segment Income before Income Tax      
Earned premiums 844 795 726
Insurance losses and contract holders' benefits 435 379 474
Underwriting, acquisition and insurance expenses $ 251 $ 233 $ 216