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Business Segments (Income Statement Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Net written premiums $ 10,605 $ 9,892 $ 9,128
Operating revenues      
Net earned premiums 10,211 9,480 8,667
Net investment income 2,497 2,264 1,805
Non-insurance warranty revenue 1,609 1,624 1,574
Other revenues 34 30 32
Total operating revenues 14,351 13,398 12,078
Claims, Benefits and Expenses      
Net incurred claims and benefits 7,704 7,039 6,628
Policyholders’ dividends 34 29 25
Amortization of deferred acquisition costs 1,798 1,644 1,490
Non-insurance warranty expense 1,547 1,544 1,471
Insurance related administrative expenses 1,275 1,251 1,160
Interest expense 133 127 112
Other expenses 197 147 179
Total claims, benefits and expenses 12,688 11,781 11,065
Income tax (expense) benefit on core income (loss) (347) (333) (177)
Core income (loss)  1,316 1,284 836
Net investment gains (losses) (81) (99) (199)
Income tax (expense) benefit on net investment gains (losses) 17 20 45
Net investment gains (losses), after tax (64) (79) (154)
Pension settlement transaction gains (losses) (371) 0 0
Income tax (expense) benefit on pension settlement transaction gains (losses) 78    
Pension settlement transaction gains (losses), after tax (293)    
Net income (loss) 959 1,205 682
Operating Segments | Specialty      
Segment Reporting Information [Line Items]      
Net written premiums 3,445 3,329 3,306
Operating revenues      
Net earned premiums 3,361 3,307 3,203
Net investment income 626 558 431
Non-insurance warranty revenue 1,609 1,624 1,574
Other revenues 2 1 1
Total operating revenues 5,598 5,490 5,209
Claims, Benefits and Expenses      
Net incurred claims and benefits 2,001 1,923 1,839
Policyholders’ dividends 9 8 6
Amortization of deferred acquisition costs 740 686 656
Non-insurance warranty expense 1,547 1,544 1,471
Insurance related administrative expenses 362 373 336
Interest expense 0 1 0
Other expenses 55 52 51
Total claims, benefits and expenses 4,714 4,587 4,359
Income tax (expense) benefit on core income (loss) (190) (195) (182)
Core income (loss)  694 708 668
Operating Segments | Commercial      
Segment Reporting Information [Line Items]      
Net written premiums 5,469 4,880 4,193
Operating revenues      
Net earned premiums 5,158 4,547 3,923
Net investment income 733 645 488
Non-insurance warranty revenue 0 0 0
Other revenues 29 29 30
Total operating revenues 5,920 5,221 4,441
Claims, Benefits and Expenses      
Net incurred claims and benefits 3,525 2,995 2,607
Policyholders’ dividends 25 21 19
Amortization of deferred acquisition costs 824 729 634
Non-insurance warranty expense 0 0 0
Insurance related administrative expenses 613 620 557
Interest expense 0 0 0
Other expenses 43 30 36
Total claims, benefits and expenses 5,030 4,395 3,853
Income tax (expense) benefit on core income (loss) (188) (174) (122)
Core income (loss)  702 652 466
Operating Segments | International      
Segment Reporting Information [Line Items]      
Net written premiums 1,262 1,237 1,164
Operating revenues      
Net earned premiums 1,256 1,176 1,070
Net investment income 131 103 63
Non-insurance warranty revenue 0 0 0
Other revenues 0 0 1
Total operating revenues 1,387 1,279 1,134
Claims, Benefits and Expenses      
Net incurred claims and benefits 764 722 637
Policyholders’ dividends 0 0 0
Amortization of deferred acquisition costs 234 229 200
Non-insurance warranty expense 0 0 0
Insurance related administrative expenses 182 139 146
Interest expense 0 0 0
Other expenses 10 (4) 26
Total claims, benefits and expenses 1,190 1,086 1,009
Income tax (expense) benefit on core income (loss) (44) (48) (19)
Core income (loss)  153 145 106
Operating Segments | Life & Group      
Segment Reporting Information [Line Items]      
Net written premiums 430 447 467
Operating revenues      
Net earned premiums 437 451 473
Net investment income 940 896 804
Non-insurance warranty revenue 0 0 0
Other revenues 0 (1) (1)
Total operating revenues 1,377 1,346 1,276
Claims, Benefits and Expenses      
Net incurred claims and benefits 1,308 1,317 1,469
Policyholders’ dividends 0 0 0
Amortization of deferred acquisition costs 0 0 0
Non-insurance warranty expense 0 0 0
Insurance related administrative expenses 119 118 118
Interest expense 0 0 0
Other expenses 2 1 9
Total claims, benefits and expenses 1,429 1,436 1,596
Income tax (expense) benefit on core income (loss) 29 42 99
Core income (loss)  (23) (48) (221)
Operating Segments | Corporate & Other      
Segment Reporting Information [Line Items]      
Net written premiums 0 0 (1)
Operating revenues      
Net earned premiums 0 0 (1)
Net investment income 67 62 19
Non-insurance warranty revenue 0 0 0
Other revenues 13 11 6
Total operating revenues 80 73 24
Claims, Benefits and Expenses      
Net incurred claims and benefits 106 82 76
Policyholders’ dividends 0 0 0
Amortization of deferred acquisition costs 0 0 0
Non-insurance warranty expense 0 0 0
Insurance related administrative expenses 0 2 4
Interest expense 133 126 112
Other expenses 97 78 62
Total claims, benefits and expenses 336 288 254
Income tax (expense) benefit on core income (loss) 46 42 47
Core income (loss)  (210) (173) (183)
Eliminations      
Segment Reporting Information [Line Items]      
Net written premiums (1) (1) (1)
Operating revenues      
Net earned premiums (1) (1) (1)
Net investment income 0 0 0
Non-insurance warranty revenue 0 0 0
Other revenues (10) (10) (5)
Total operating revenues (11) (11) (6)
Claims, Benefits and Expenses      
Net incurred claims and benefits 0 0 0
Policyholders’ dividends 0 0 0
Amortization of deferred acquisition costs 0 0 0
Non-insurance warranty expense 0 0 0
Insurance related administrative expenses (1) (1) (1)
Interest expense 0 0 0
Other expenses (10) (10) (5)
Total claims, benefits and expenses (11) (11) (6)
Income tax (expense) benefit on core income (loss) 0 0 0
Core income (loss)  $ 0 $ 0 $ 0