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RESERVE FOR LOSSES AND LAE - Schedule of Ultimate Loss and ALAE and Paid Loss and ALAE, Net of Reinsurance (Details)
$ in Millions
Dec. 31, 2023
USD ($)
claim
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Claims Development [Line Items]                    
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance $ 22,192                  
Reinsurance | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 17,185                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 6,687                  
All outstanding liabilities prior to 2014, net of reinsurance 995                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 11,493                  
Reinsurance | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 22,126                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 16,720                  
All outstanding liabilities prior to 2014, net of reinsurance (24)                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 5,379                  
Reinsurance | Accident Year 2014 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 720 $ 728 $ 738 $ 740 $ 727 $ 750 $ 792 $ 815 $ 928 $ 881
Total of IBNR Liabilities Plus Expected Development on Reported Claims 0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 635 613 591 550 505 429 304 214 123 58
Reinsurance | Accident Year 2014 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 917 917 919 919 926 925 926 1,019 1,214 1,511
Total of IBNR Liabilities Plus Expected Development on Reported Claims 8                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 882 882 881 879 872 862 830 756 632 361
Reinsurance | Accident Year 2015 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 839 840 842 842 805 822 824 828 900  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 42                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 682 654 618 571 502 413 267 160 58  
Reinsurance | Accident Year 2015 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 929 932 935 933 941 938 964 1,044 1,522  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 896 893 887 878 857 829 746 596 372  
Reinsurance | Accident Year 2016 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,007 977 946 945 869 874 877 800    
Total of IBNR Liabilities Plus Expected Development on Reported Claims 79                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 767 699 622 546 432 326 191 90    
Reinsurance | Accident Year 2016 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,517 1,515 1,518 1,517 1,540 1,546 1,510 1,689    
Total of IBNR Liabilities Plus Expected Development on Reported Claims 16                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,453 1,442 1,429 1,410 1,357 1,239 951 461    
Reinsurance | Accident Year 2017 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,059 995 939 931 849 843 883      
Total of IBNR Liabilities Plus Expected Development on Reported Claims 78                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 796 687 585 462 321 189 81      
Reinsurance | Accident Year 2017 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 3,713 3,699 3,689 3,643 3,515 3,404 2,781      
Total of IBNR Liabilities Plus Expected Development on Reported Claims 9                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3,495 3,420 3,326 3,124 2,739 2,174 813      
Reinsurance | Accident Year 2018 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,658 1,561 1,493 1,462 1,385 1,388        
Total of IBNR Liabilities Plus Expected Development on Reported Claims 320                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 998 819 636 480 294 170        
Reinsurance | Accident Year 2018 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,369 2,384 2,431 2,493 2,491 2,615        
Total of IBNR Liabilities Plus Expected Development on Reported Claims (1)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,198 2,133 2,061 1,865 1,520 541        
Reinsurance | Accident Year 2019 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,867 1,826 1,801 1,799 1,734          
Total of IBNR Liabilities Plus Expected Development on Reported Claims 520                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 957 728 523 354 224          
Reinsurance | Accident Year 2019 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,879 1,875 1,991 2,045 2,014          
Total of IBNR Liabilities Plus Expected Development on Reported Claims (13)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,778 1,651 1,489 1,167 716          
Reinsurance | Accident Year 2020 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,859 1,898 1,919 1,947            
Total of IBNR Liabilities Plus Expected Development on Reported Claims 799                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 729 496 312 199            
Reinsurance | Accident Year 2020 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,386 2,414 2,470 2,397            
Total of IBNR Liabilities Plus Expected Development on Reported Claims 58                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,993 1,711 1,302 576            
Reinsurance | Accident Year 2021 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,433 2,492 2,497              
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1,496                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 547 322 213              
Reinsurance | Accident Year 2021 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,699 2,777 2,751              
Total of IBNR Liabilities Plus Expected Development on Reported Claims 152                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,024 1,528 676              
Reinsurance | Accident Year 2022 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,722 2,764                
Total of IBNR Liabilities Plus Expected Development on Reported Claims 2,049                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 353 188                
Reinsurance | Accident Year 2022 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,926 3,247                
Total of IBNR Liabilities Plus Expected Development on Reported Claims 822                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,389 638                
Reinsurance | Accident Year 2023 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 3,023                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 2,537                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 223                  
Reinsurance | Accident Year 2023 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,791                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1,537                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 612                  
Insurance | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 9,266                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 4,762                  
All outstanding liabilities prior to 2014, net of reinsurance 125                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 4,629                  
Insurance | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 4,648                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3,959                  
All outstanding liabilities prior to 2014, net of reinsurance 0                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 690                  
Insurance | Accident Year 2014 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 399 400 398 399 398 397 460 454 457 431
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 21                  
Cumulative Number of Reported Claims | claim 26,359                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 368 360 351 339 326 298 257 202 125 41
Insurance | Accident Year 2014 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 135 135 135 135 135 135 135 137 143 140
Total of IBNR Liabilities Plus Expected Development on Reported Claims 0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 134 134 134 134 134 134 134 133 127 $ 86
Insurance | Accident Year 2015 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 482 479 472 472 468 542 535 528 519  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 25                  
Cumulative Number of Reported Claims | claim 28,556                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 448 435 413 382 353 292 219 135 44  
Insurance | Accident Year 2015 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 167 168 166 165 164 163 162 171 188  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 166 166 165 164 163 161 158 153 $ 108  
Insurance | Accident Year 2016 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 551 542 539 550 613 579 550 552    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 36                  
Cumulative Number of Reported Claims | claim 33,104                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 504 481 443 401 342 269 164 55    
Insurance | Accident Year 2016 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 314 311 311 309 304 295 292 296    
Total of IBNR Liabilities Plus Expected Development on Reported Claims 2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 311 310 310 308 302 283 259 $ 168    
Insurance | Accident Year 2017 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 668 631 629 653 621 601 610      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 74                  
Cumulative Number of Reported Claims | claim 37,077                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 571 529 454 379 280 172 54      
Insurance | Accident Year 2017 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 522 520 508 506 498 507 498      
Total of IBNR Liabilities Plus Expected Development on Reported Claims 4                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 517 516 507 489 465 429 $ 181      
Insurance | Accident Year 2018 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 867 771 756 743 706 702        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 139                  
Cumulative Number of Reported Claims | claim 37,914                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 696 594 444 317 208 63        
Insurance | Accident Year 2018 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 446 438 419 410 408 412        
Total of IBNR Liabilities Plus Expected Development on Reported Claims 6                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 439 433 418 385 364 $ 246        
Insurance | Accident Year 2019 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,076 887 877 846 849          
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 211                  
Cumulative Number of Reported Claims | claim 41,579                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 729 551 397 235 72          
Insurance | Accident Year 2019 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 395 379 364 367 360          
Total of IBNR Liabilities Plus Expected Development on Reported Claims 9                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 378 369 350 325 $ 233          
Insurance | Accident Year 2020 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,035 1,045 1,050 994            
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 304                  
Cumulative Number of Reported Claims | claim 39,785                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 556 388 236 67            
Insurance | Accident Year 2020 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 521 514 519 614            
Total of IBNR Liabilities Plus Expected Development on Reported Claims 30                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 483 467 427 $ 301            
Insurance | Accident Year 2021 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,258 1,248 1,190              
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 546                  
Cumulative Number of Reported Claims | claim 46,257                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 483 261 110              
Insurance | Accident Year 2021 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 609 595 660              
Total of IBNR Liabilities Plus Expected Development on Reported Claims 41                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 550 488 $ 332              
Insurance | Accident Year 2022 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,364 1,369                
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 805                  
Cumulative Number of Reported Claims | claim 47,484                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 309 85                
Insurance | Accident Year 2022 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 806 783                
Total of IBNR Liabilities Plus Expected Development on Reported Claims 141                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 576 $ 381                
Insurance | Accident Year 2023 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,567                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 964                  
Cumulative Number of Reported Claims | claim 36,849                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 98                  
Insurance | Accident Year 2023 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 734                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 215                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 405