v3.25.4
RESERVE FOR LOSSES AND LAE - Schedule of Ultimate Loss and ALAE and Paid Loss and ALAE, Net of Reinsurance (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
claim
Dec. 31, 2024
USD ($)
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 ($)
Dec. 31, 2016
USD ($)
Claims Development [Line Items]                    
Liability for unpaid claims and claims adjustment expense, incurred claims $ 10,859 $ 11,305 $ 8,427              
Reinsurance | Casualty Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 22,986                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 9,824                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 14,048                  
All outstanding liabilities prior to 2016, net of reinsurance 886                  
Reinsurance | Casualty Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,055 1,032 1,009 $ 980 $ 949 $ 947 $ 872 $ 877 $ 880 $ 798
Total of IBNR Liabilities Plus Expected Development on Reported Claims 37                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 903 840 775 706 627 552 437 330 195 93
Reinsurance | Casualty Insurance | Accident Year 2017                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,156 1,084 1,056 992 936 928 847 840 880  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 50                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,020 931 802 692 582 466 325 192 83  
Reinsurance | Casualty Insurance | Accident Year 2018                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,686 1,791 1,734 1,638 1,569 1,539 1,462 1,464    
Total of IBNR Liabilities Plus Expected Development on Reported Claims 93                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,347 1,224 1,017 837 665 507 304 200    
Reinsurance | Casualty Insurance | Accident Year 2019                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,980 1,978 1,918 1,877 1,853 1,850 1,785      
Total of IBNR Liabilities Plus Expected Development on Reported Claims 255                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,424 1,240 969 740 548 375 251      
Reinsurance | Casualty Insurance | Accident Year 2020                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,899 1,932 1,889 1,928 1,949 1,977        
Total of IBNR Liabilities Plus Expected Development on Reported Claims 349                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,246 1,009 740 505 323 210        
Reinsurance | Casualty Insurance | Accident Year 2021                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,370 2,532 2,441 2,501 2,505          
Total of IBNR Liabilities Plus Expected Development on Reported Claims 748                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,194 858 552 327 229          
Reinsurance | Casualty Insurance | Accident Year 2022                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 3,098 2,968 2,917 2,959            
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1,439                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,104 693 388 220            
Reinsurance | Casualty Insurance | Accident Year 2023                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 3,276 3,158 2,993              
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1,927                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 832 433 211              
Reinsurance | Casualty Insurance | Accident Year 2024                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 3,237 3,143                
Total of IBNR Liabilities Plus Expected Development on Reported Claims 2,434                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 485 236                
Reinsurance | Casualty Insurance | Accident Year 2025                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 3,228                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 2,760                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 268                  
Reinsurance | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 28,415                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 21,011                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 7,423                  
All outstanding liabilities prior to 2016, net of reinsurance 20                  
Reinsurance | Property Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,542 1,539 1,545 1,543 1,547 1,546 1,568 1,574 1,539 1,711
Total of IBNR Liabilities Plus Expected Development on Reported Claims 3                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,346 1,345 1,332 1,320 1,312 1,289 1,239 1,130 855 445
Reinsurance | Property Insurance | Accident Year 2017                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 3,817 3,753 3,734 3,720 3,710 3,664 3,536 3,425 2,802  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 5                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,384 2,377 2,248 2,203 2,171 2,064 1,843 1,581 905  
Reinsurance | Property Insurance | Accident Year 2018                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,532 2,429 2,394 2,409 2,456 2,518 2,516 2,641    
Total of IBNR Liabilities Plus Expected Development on Reported Claims 60                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 4,511 4,511 4,324 4,179 3,969 3,566 2,847 1,254    
Reinsurance | Property Insurance | Accident Year 2019                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,107 2,026 1,975 1,972 2,087 2,142 2,111      
Total of IBNR Liabilities Plus Expected Development on Reported Claims 62                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,748 1,733 1,601 1,501 1,374 1,077 465      
Reinsurance | Property Insurance | Accident Year 2020                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,582 2,439 2,437 2,465 2,521 2,448        
Total of IBNR Liabilities Plus Expected Development on Reported Claims 65                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,059 1,967 1,676 1,409 992 272        
Reinsurance | Property Insurance | Accident Year 2021                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,749 2,639 2,750 2,828 2,802          
Total of IBNR Liabilities Plus Expected Development on Reported Claims 83                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,360 2,153 1,825 1,362 630          
Reinsurance | Property Insurance | Accident Year 2022                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,601 2,697 2,991 3,313            
Total of IBNR Liabilities Plus Expected Development on Reported Claims 97                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 2,419 2,177 1,613 769            
Reinsurance | Property Insurance | Accident Year 2023                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 2,217 2,493 2,870              
Total of IBNR Liabilities Plus Expected Development on Reported Claims 256                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,721 1,297 609              
Reinsurance | Property Insurance | Accident Year 2024                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 3,763 4,056                
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1,254                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,443 761                
Reinsurance | Property Insurance | Accident Year 2025                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 4,505                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 2,354                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 1,020                  
Insurance | Casualty Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 12,721                  
2025 Prior Year Development Excluding the Impact of ADC 474                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 4,853                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 6,227                  
Short duration insurance contracts liability for unpaid claims and allocated claim adjustment expense net prior 104                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 6,597                  
Incurred Impact of ADC 1,015                  
IBNR Impact of ADC 706                  
2025 (Net of Impact of ADC) 11,706                  
Total of IBNR Liabilities Net of Impact of ADC 4,148                  
All outstanding liabilities prior to 2016, net of reinsurance 104                  
Insurance | Casualty Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 507 493 488 478 474 489 558 539 495 509
2025 Prior Year Development Excluding the Impact of ADC 13                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 17                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below $ 471 460 448 430 398 362 314 253 149 53
Cumulative Number of Reported Claims | claim 31,277                  
Incurred Impact of ADC $ 9                  
IBNR Impact of ADC 3                  
2025 (Net of Impact of ADC) 498                  
Total of IBNR Liabilities Net of Impact of ADC 14                  
Insurance | Casualty Insurance | Accident Year 2017                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 596 580 584 559 559 585 568 558 551  
2025 Prior Year Development Excluding the Impact of ADC 15                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 31                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below $ 537 526 493 467 404 343 263 165 49  
Cumulative Number of Reported Claims | claim 34,849                  
Incurred Impact of ADC $ 11                  
IBNR Impact of ADC 5                  
2025 (Net of Impact of ADC) 584                  
Total of IBNR Liabilities Net of Impact of ADC 26                  
Insurance | Casualty Insurance | Accident Year 2018                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 832 810 772 697 685 679 649 644    
2025 Prior Year Development Excluding the Impact of ADC 21                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 43                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below $ 722 678 623 539 407 296 196 61    
Cumulative Number of Reported Claims | claim 34,920                  
Incurred Impact of ADC $ 16                  
IBNR Impact of ADC 6                  
2025 (Net of Impact of ADC) 816                  
Total of IBNR Liabilities Net of Impact of ADC 37                  
Insurance | Casualty Insurance | Accident Year 2019                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,080 1,089 954 804 798 778 776      
2025 Prior Year Development Excluding the Impact of ADC (9)                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 98                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below $ 901 828 646 498 364 218 69      
Cumulative Number of Reported Claims | claim 37,936                  
Incurred Impact of ADC $ 37                  
IBNR Impact of ADC 19                  
2025 (Net of Impact of ADC) 1,044                  
Total of IBNR Liabilities Net of Impact of ADC 79                  
Insurance | Casualty Insurance | Accident Year 2020                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,080 1,095 975 978 990 913        
2025 Prior Year Development Excluding the Impact of ADC (15)                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 163                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below $ 808 659 531 372 229 63        
Cumulative Number of Reported Claims | claim 39,683                  
Incurred Impact of ADC $ 53                  
IBNR Impact of ADC 32                  
2025 (Net of Impact of ADC) 1,027                  
Total of IBNR Liabilities Net of Impact of ADC 131                  
Insurance | Casualty Insurance | Accident Year 2021                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,343 1,353 1,154 1,161 1,119          
2025 Prior Year Development Excluding the Impact of ADC (10)                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 310                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below $ 855 654 428 246 105          
Cumulative Number of Reported Claims | claim 44,838                  
Incurred Impact of ADC $ 102                  
IBNR Impact of ADC 63                  
2025 (Net of Impact of ADC) 1,241                  
Total of IBNR Liabilities Net of Impact of ADC 246                  
Insurance | Casualty Insurance | Accident Year 2022                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,720 1,597 1,241 1,243            
2025 Prior Year Development Excluding the Impact of ADC 124                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 591                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below $ 859 577 282 79            
Cumulative Number of Reported Claims | claim 48,143                  
Incurred Impact of ADC $ 191                  
IBNR Impact of ADC 130                  
2025 (Net of Impact of ADC) 1,530                  
Total of IBNR Liabilities Net of Impact of ADC 460                  
Insurance | Casualty Insurance | Accident Year 2023                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,931 1,739 1,425              
2025 Prior Year Development Excluding the Impact of ADC 191                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 891                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below $ 642 308 93              
Cumulative Number of Reported Claims | claim 47,258                  
Incurred Impact of ADC $ 274                  
IBNR Impact of ADC 191                  
2025 (Net of Impact of ADC) 1,657                  
Total of IBNR Liabilities Net of Impact of ADC 701                  
Insurance | Casualty Insurance | Accident Year 2024                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,935 1,792                
2025 Prior Year Development Excluding the Impact of ADC 143                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1,251                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below $ 347 85                
Cumulative Number of Reported Claims | claim 43,636                  
Incurred Impact of ADC $ 322                  
IBNR Impact of ADC 257                  
2025 (Net of Impact of ADC) 1,612                  
Total of IBNR Liabilities Net of Impact of ADC 994                  
Insurance | Casualty Insurance | Accident Year 2025                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 1,698                  
2025 Prior Year Development Excluding the Impact of ADC 0                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1,458                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below $ 86                  
Cumulative Number of Reported Claims | claim 30,732                  
Incurred Impact of ADC $ 0                  
IBNR Impact of ADC 0                  
2025 (Net of Impact of ADC) 1,698                  
Total of IBNR Liabilities Net of Impact of ADC 1,458                  
Insurance | Casualty Insurance | Short Duration Insurance Contracts Accident Years Prior To Current Year                    
Claims Development [Line Items]                    
2025 Prior Year Development Excluding the Impact of ADC 474                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below                  
Liability for unpaid claims and claims adjustment expense, incurred claims 0                  
Insurance | Casualty Insurance | Incurred Impact Of Adverse Development Cover                    
Claims Development [Line Items]                    
Total of IBNR Liabilities Plus Expected Development on Reported Claims 4,880                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below                  
Short duration insurance contracts liability for unpaid claims and allocated claim adjustment expense net prior 27                  
Insurance | Casualty Insurance | Short Duration Insurance Contracts Last Ten Accident Years                    
Claims Development [Line Items]                    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 0                  
Short duration insurance contracts liability for unpaid claims and allocated claim adjustment expense net prior 32                  
Incurred Impact of ADC 1,046                  
Insurance | Casualty Insurance | Short Duration Insurance Contracts IBNR Impact Of Last Ten Accident Years                    
Claims Development [Line Items]                    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below                  
Short duration insurance contracts liability for unpaid claims and allocated claim adjustment expense net prior 7                  
IBNR Impact of ADC 713                  
Insurance | Casualty Insurance | Net Of Impact Of Adverse Development Reinsurance Cover                    
Claims Development [Line Items]                    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 6,227                  
Short duration insurance contracts liability for unpaid claims and allocated claim adjustment expense net prior 72                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 5,551                  
Insurance | Casualty Insurance | Short Duration Insurance Contracts INBR Liabilities Net Of Impact Of Last Ten Accident Years                    
Claims Development [Line Items]                    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below                  
Short duration insurance contracts liability for unpaid claims and allocated claim adjustment expense net prior 20                  
Total of IBNR Liabilities Net of Impact of ADC 4,167                  
Insurance | Property Insurance                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 5,490                  
2025 Prior Year Development Excluding the Impact of ADC (113)                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 536                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 4,507                  
Short duration insurance contracts liability for unpaid claims and allocated claim adjustment expense net prior 0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 983                  
Incurred Impact of ADC 29                  
IBNR Impact of ADC 14                  
2025 (Net of Impact of ADC) 5,461                  
Total of IBNR Liabilities Net of Impact of ADC 522                  
All outstanding liabilities prior to 2016, net of reinsurance 0                  
Insurance | Property Insurance | Accident Year 2016                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 300 302 302 300 299 297 292 284 280 289
2025 Prior Year Development Excluding the Impact of ADC (2)                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 0                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 300 300 300 299 297 296 290 272 248 $ 167
Incurred Impact of ADC 0                  
IBNR Impact of ADC 0                  
2025 (Net of Impact of ADC) 300                  
Total of IBNR Liabilities Net of Impact of ADC 0                  
Insurance | Property Insurance | Accident Year 2017                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 505 506 509 508 496 494 486 494 486  
2025 Prior Year Development Excluding the Impact of ADC (1)                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 0                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 505 505 504 505 493 477 452 416 $ 176  
Incurred Impact of ADC 0                  
IBNR Impact of ADC 0                  
2025 (Net of Impact of ADC) 505                  
Total of IBNR Liabilities Net of Impact of ADC 0                  
Insurance | Property Insurance | Accident Year 2018                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 432 435 436 428 410 401 399 403    
2025 Prior Year Development Excluding the Impact of ADC (3)                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 1                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 431 431 429 424 407 376 356 $ 240    
Incurred Impact of ADC 0                  
IBNR Impact of ADC 0                  
2025 (Net of Impact of ADC) 432                  
Total of IBNR Liabilities Net of Impact of ADC 1                  
Insurance | Property Insurance | Accident Year 2019                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 372 375 380 365 350 352 348      
2025 Prior Year Development Excluding the Impact of ADC (3)                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 2                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 370 368 363 355 335 313 $ 226      
Incurred Impact of ADC 0                  
IBNR Impact of ADC 0                  
2025 (Net of Impact of ADC) 372                  
Total of IBNR Liabilities Net of Impact of ADC 1                  
Insurance | Property Insurance | Accident Year 2020                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 490 492 503 498 508 602        
2025 Prior Year Development Excluding the Impact of ADC (2)                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 6                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 478 473 465 450 413 $ 292        
Incurred Impact of ADC 1                  
IBNR Impact of ADC 0                  
2025 (Net of Impact of ADC) 489                  
Total of IBNR Liabilities Net of Impact of ADC 6                  
Insurance | Property Insurance | Accident Year 2021                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 603 628 602 586 647          
2025 Prior Year Development Excluding the Impact of ADC (25)                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 13                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 576 565 544 482 $ 325          
Incurred Impact of ADC 2                  
IBNR Impact of ADC 1                  
2025 (Net of Impact of ADC) 601                  
Total of IBNR Liabilities Net of Impact of ADC 11                  
Insurance | Property Insurance | Accident Year 2022                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 661 698 797 771            
2025 Prior Year Development Excluding the Impact of ADC (37)                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 19                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 615 594 567 $ 377            
Incurred Impact of ADC 4                  
IBNR Impact of ADC 2                  
2025 (Net of Impact of ADC) 656                  
Total of IBNR Liabilities Net of Impact of ADC 16                  
Insurance | Property Insurance | Accident Year 2023                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 635 669 717              
2025 Prior Year Development Excluding the Impact of ADC (35)                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 33                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 565 503 $ 400              
Incurred Impact of ADC 7                  
IBNR Impact of ADC 4                  
2025 (Net of Impact of ADC) 628                  
Total of IBNR Liabilities Net of Impact of ADC 29                  
Insurance | Property Insurance | Accident Year 2024                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 592 598                
2025 Prior Year Development Excluding the Impact of ADC (6)                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 53                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 379 $ 200                
Incurred Impact of ADC 14                  
IBNR Impact of ADC 6                  
2025 (Net of Impact of ADC) 578                  
Total of IBNR Liabilities Net of Impact of ADC 46                  
Insurance | Property Insurance | Accident Year 2025                    
Claims Development [Line Items]                    
Ultimate incurred loss and allocated loss adjustment expenses, net of reinsurance 900                  
2025 Prior Year Development Excluding the Impact of ADC 0                  
Total of IBNR Liabilities Plus Expected Development on Reported Claims 410                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 289                  
Incurred Impact of ADC 0                  
IBNR Impact of ADC 0                  
2025 (Net of Impact of ADC) 900                  
Total of IBNR Liabilities Net of Impact of ADC 410                  
Insurance | Property Insurance | Short Duration Insurance Contracts Accident Years Prior To Current Year                    
Claims Development [Line Items]                    
2025 Prior Year Development Excluding the Impact of ADC (113)                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below                  
Liability for unpaid claims and claims adjustment expense, incurred claims 0                  
Insurance | Property Insurance | Incurred Impact Of Adverse Development Cover                    
Claims Development [Line Items]                    
Total of IBNR Liabilities Plus Expected Development on Reported Claims 537                  
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below                  
Short duration insurance contracts liability for unpaid claims and allocated claim adjustment expense net prior 0                  
Insurance | Property Insurance | Short Duration Insurance Contracts Last Ten Accident Years                    
Claims Development [Line Items]                    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 0                  
Short duration insurance contracts liability for unpaid claims and allocated claim adjustment expense net prior 0                  
Incurred Impact of ADC 29                  
Insurance | Property Insurance | Short Duration Insurance Contracts IBNR Impact Of Last Ten Accident Years                    
Claims Development [Line Items]                    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below                  
Short duration insurance contracts liability for unpaid claims and allocated claim adjustment expense net prior 0                  
IBNR Impact of ADC 14                  
Insurance | Property Insurance | Net Of Impact Of Adverse Development Reinsurance Cover                    
Claims Development [Line Items]                    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below 4,507                  
Short duration insurance contracts liability for unpaid claims and allocated claim adjustment expense net prior 0                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 954                  
Insurance | Property Insurance | Short Duration Insurance Contracts INBR Liabilities Net Of Impact Of Last Ten Accident Years                    
Claims Development [Line Items]                    
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below                  
Short duration insurance contracts liability for unpaid claims and allocated claim adjustment expense net prior 0                  
Total of IBNR Liabilities Net of Impact of ADC $ 522