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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, 2024
USD ($)
claim
Dec. 31, 2023
USD ($)
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 ($)
Dec. 31, 2015
USD ($)
Reinsurance | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance $ 20,240                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 8,048                  
All outstanding liabilities prior to 2015, net of reinsurance 617                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance (1) 12,810                  
Reinsurance | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 24,337                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 18,355                  
All outstanding liabilities prior to 2015, net of reinsurance 46                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance (1) 6,028                  
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 845 $ 832 $ 833 $ 835 $ 835 $ 799 $ 815 $ 818 $ 821 $ 777
Total of IBNR Liabilities Plus Expected Development on Reported Claims 45                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 702 677 650 613 567 499 410 265 158 56
Reinsurance | Accident Year 2015 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 911 921 924 927 925 933 930 956 1,037 1,378
Total of IBNR Liabilities Plus Expected Development on Reported Claims 0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 889 888 884 879 871 850 823 740 591 369
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 1,022 1,000 970 940 938 862 867 870 792  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 52                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 826 762 693 618 542 429 323 189 89  
Reinsurance | Accident Year 2016 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,502 1,509 1,507 1,511 1,510 1,532 1,538 1,502 1,681  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,128 1,084 1,082 1,081 1,089 1,080 1,056 946 459  
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 1,079 1,051 986 931 922 841 834 875    
Total of IBNR Liabilities Plus Expected Development on Reported Claims 24                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 917 790 681 582 458 317 186 80    
Reinsurance | Accident Year 2017 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 3,724 3,705 3,692 3,681 3,636 3,507 3,396 2,773    
Total of IBNR Liabilities Plus Expected Development on Reported Claims 3                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3,590 3,482 3,407 3,313 3,117 2,733 2,170 810    
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 1,775 1,718 1,621 1,553 1,522 1,445 1,447      
Total of IBNR Liabilities Plus Expected Development on Reported Claims 246                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,214 1,008 828 652 497 296 188      
Reinsurance | Accident Year 2018 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,382 2,347 2,362 2,409 2,471 2,469 2,594      
Total of IBNR Liabilities Plus Expected Development on Reported Claims 3                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,307 2,184 2,121 2,047 1,857 1,509 534      
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 1,954 1,893 1,853 1,828 1,826 1,761        
Total of IBNR Liabilities Plus Expected Development on Reported Claims 346                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,234 963 735 533 364 239        
Reinsurance | Accident Year 2019 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,920 1,869 1,866 1,981 2,036 2,005        
Total of IBNR Liabilities Plus Expected Development on Reported Claims 2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,934 1,771 1,645 1,482 1,159 714        
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 1,911 1,869 1,907 1,928 1,957          
Total of IBNR Liabilities Plus Expected Development on Reported Claims 588                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 987 720 486 307 205          
Reinsurance | Accident Year 2020 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,379 2,377 2,405 2,461 2,388          
Total of IBNR Liabilities Plus Expected Development on Reported Claims 3                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,251 1,989 1,706 1,302 571          
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 2,518 2,427 2,487 2,491            
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1,229                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 845 542 319 206            
Reinsurance | Accident Year 2021 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,582 2,692 2,770 2,745            
Total of IBNR Liabilities Plus Expected Development on Reported Claims 14                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,420 2,014 1,523 679            
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 2,739 2,688 2,730              
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1,658                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 646 345 184              
Reinsurance | Accident Year 2022 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,586 2,880 3,202              
Total of IBNR Liabilities Plus Expected Development on Reported Claims 261                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,896 1,364 619              
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 3,123 2,958                
Total of IBNR Liabilities Plus Expected Development on Reported Claims 2,315                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 422 201                
Reinsurance | Accident Year 2023 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,411 2,788                
Total of IBNR Liabilities Plus Expected Development on Reported Claims 662                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,165 600                
Reinsurance | Accident Year 2024 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 3,275                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 2,756                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 256                  
Reinsurance | Accident Year 2024 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 3,940                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 2,214                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 774                  
Insurance | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 10,993                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 5,200                  
All outstanding liabilities prior to 2015, net of reinsurance 97                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance (1) 5,891                  
Insurance | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 4,864                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 4,102                  
All outstanding liabilities prior to 2015, net of reinsurance 0                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance (1) 762                  
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 445 426 434 427 426 427 503 500 492 487
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 11                  
Cumulative Number of Reported Claims | claim 27,331                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 417 409 397 379 351 325 270 208 127 43
Insurance | Accident Year 2015 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 165 164 165 163 162 161 160 159 169 179
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 164 163 163 162 161 160 158 155 153 $ 107
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 494 488 478 474 489 557 538 510 504  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 17                  
Cumulative Number of Reported Claims | claim 31,267                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 460 448 430 398 362 314 253 156 51  
Insurance | Accident Year 2016 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 301 302 300 299 297 292 284 281 289  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 299 299 299 297 296 290 272 249 $ 167  
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 580 584 559 559 585 567 557 559    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 32                  
Cumulative Number of Reported Claims | claim 34,793                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 527 493 467 404 343 263 165 52    
Insurance | Accident Year 2017 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 506 509 508 496 494 486 494 486    
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 505 504 505 493 477 452 416 $ 176    
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 811 772 697 685 679 648 643      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 64                  
Cumulative Number of Reported Claims | claim 34,838                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 678 623 539 407 296 196 61      
Insurance | Accident Year 2018 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 435 436 428 410 401 399 403      
Total of IBNR Liabilities Plus Expected Development on Reported Claims 3                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 431 429 424 407 376 356 $ 240      
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 1,089 953 804 797 777 774        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 145                  
Cumulative Number of Reported Claims | claim 37,837                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 828 646 498 364 218 69        
Insurance | Accident Year 2019 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 375 380 365 350 352 347        
Total of IBNR Liabilities Plus Expected Development on Reported Claims 6                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 368 363 355 335 313 $ 226        
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 1,096 975 977 989 912          
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 273                  
Cumulative Number of Reported Claims | claim 39,675                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 659 531 372 229 63          
Insurance | Accident Year 2020 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 492 503 498 508 601          
Total of IBNR Liabilities Plus Expected Development on Reported Claims 10                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 473 465 450 413 $ 292          
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 1,353 1,153 1,159 1,117            
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 464                  
Cumulative Number of Reported Claims | claim 44,458                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 655 428 246 105            
Insurance | Accident Year 2021 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 628 602 585 646            
Total of IBNR Liabilities Plus Expected Development on Reported Claims 37                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 565 544 482 $ 325            
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 1,597 1,239 1,241              
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 739                  
Cumulative Number of Reported Claims | claim 46,433                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 578 282 79              
Insurance | Accident Year 2022 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 698 796 770              
Total of IBNR Liabilities Plus Expected Development on Reported Claims 42                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 594 567 $ 377              
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 1,740 1,424                
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 1,125                  
Cumulative Number of Reported Claims | claim 44,372                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 311 93                
Insurance | Accident Year 2023 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 669 717                
Total of IBNR Liabilities Plus Expected Development on Reported Claims 94                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 503 $ 400                
Insurance | Accident Year 2024 | Property, Liability and Casualty Insurance Product Line                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,788                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 1,546                  
Cumulative Number of Reported Claims | claim 33,512                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 85                  
Insurance | Accident Year 2024 | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 597                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 192                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 200