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Insurance - Short-duration insurance contracts, claims development (Details) - Property and casualty insurance
$ 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 ($)
Dec. 31, 2015
USD ($)
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 27,160                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 19,584                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 388                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 7,964                  
Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 2,009 $ 1,991 $ 1,998 $ 2,003 $ 2,013 $ 2,022 $ 2,038 $ 2,041 $ 2,047 $ 2,114
Total IBNR Plus Expected Development on Reported Claims $ 50                  
Cumulative Number of Reported Claims | claim 231,366                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,924 1,909 1,878 1,847 1,791 1,722 1,592 1,404 1,129 619
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 95.80%                  
Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,970 1,974 1,986 2,004 2,034 2,060 2,082 2,083 2,117  
Total IBNR Plus Expected Development on Reported Claims $ 68                  
Cumulative Number of Reported Claims | claim 223,427                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,865 1,848 1,806 1,750 1,662 1,539 1,350 1,099 577  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 94.70%                  
Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,283 2,266 2,256 2,269 2,301 2,329 2,348 2,375    
Total IBNR Plus Expected Development on Reported Claims $ 107                  
Cumulative Number of Reported Claims | claim 247,358                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 2,100 2,030 1,953 1,844 1,736 1,524 1,250 709    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 92.00%                  
Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,451 2,449 2,452 2,439 2,499 2,516 2,507      
Total IBNR Plus Expected Development on Reported Claims $ 165                  
Cumulative Number of Reported Claims | claim 237,209                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 2,178 2,099 1,977 1,807 1,606 1,337 730      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 88.90%                  
Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,657 2,642 2,632 2,672 2,674 2,721        
Total IBNR Plus Expected Development on Reported Claims $ 220                  
Cumulative Number of Reported Claims | claim 256,368                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 2,284 2,160 1,983 1,768 1,448 847        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 86.00%                  
Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,512 2,500 2,546 2,635 2,748          
Total IBNR Plus Expected Development on Reported Claims $ 288                  
Cumulative Number of Reported Claims | claim 206,650                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 2,043 1,842 1,620 1,337 758          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 81.30%                  
Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,669 2,689 2,754 2,861            
Total IBNR Plus Expected Development on Reported Claims $ 467                  
Cumulative Number of Reported Claims | claim 208,142                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,958 1,687 1,368 746            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 73.40%                  
Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 3,204 3,205 3,270              
Total IBNR Plus Expected Development on Reported Claims $ 698                  
Cumulative Number of Reported Claims | claim 221,140                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 2,144 1,724 904              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 66.90%                  
Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 3,580 3,631                
Total IBNR Plus Expected Development on Reported Claims $ 1,121                  
Cumulative Number of Reported Claims | claim 230,821                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,950 989                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 54.50%                  
Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 3,825                  
Total IBNR Plus Expected Development on Reported Claims $ 1,775                  
Cumulative Number of Reported Claims | claim 232,071                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,138                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 29.80%                  
Excludes short-duration insurance contracts detail for accident years not separately presented                    
Claims Development [Line Items]                    
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) $ 7,576                  
Property and transportation                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 10,482                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 8,808                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 22                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 1,696                  
Property and transportation | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 769 769 769 768 772 777 777 779 784 818
Total IBNR Plus Expected Development on Reported Claims $ 3                  
Cumulative Number of Reported Claims | claim 135,094                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 762 761 755 750 744 736 707 667 582 359
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 99.10%                  
Property and transportation | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 686 689 689 688 694 706 714 716 746  
Total IBNR Plus Expected Development on Reported Claims $ 5                  
Cumulative Number of Reported Claims | claim 121,410                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 674 672 665 656 640 618 577 521 294  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 98.30%                  
Property and transportation | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 817 820 820 816 823 843 847 889    
Total IBNR Plus Expected Development on Reported Claims $ 7                  
Cumulative Number of Reported Claims | claim 141,023                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 804 794 783 755 735 696 640 379    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 98.40%                  
Property and transportation | Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 878 876 882 876 886 902 932      
Total IBNR Plus Expected Development on Reported Claims $ 9                  
Cumulative Number of Reported Claims | claim 130,781                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 852 838 824 781 738 676 396      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 97.00%                  
Property and transportation | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,059 1,057 1,055 1,051 1,058 1,111        
Total IBNR Plus Expected Development on Reported Claims $ 18                  
Cumulative Number of Reported Claims | claim 154,370                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,023 998 959 904 823 527        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 96.60%                  
Property and transportation | Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 948 949 957 974 1,043          
Total IBNR Plus Expected Development on Reported Claims $ 22                  
Cumulative Number of Reported Claims | claim 122,246                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 896 857 804 726 461          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 94.50%                  
Property and transportation | Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,028 1,022 1,023 1,119            
Total IBNR Plus Expected Development on Reported Claims $ 50                  
Cumulative Number of Reported Claims | claim 123,746                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 935 867 767 449            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 91.00%                  
Property and transportation | Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,313 1,316 1,393              
Total IBNR Plus Expected Development on Reported Claims $ 100                  
Cumulative Number of Reported Claims | claim 137,902                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,119 1,018 587              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 85.20%                  
Property and transportation | Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,392 1,472                
Total IBNR Plus Expected Development on Reported Claims $ 178                  
Cumulative Number of Reported Claims | claim 143,664                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,065 562                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 76.50%                  
Property and transportation | Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,592                  
Total IBNR Plus Expected Development on Reported Claims $ 419                  
Cumulative Number of Reported Claims | claim 156,368                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 678                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 42.60%                  
Property and transportation | Excludes short-duration insurance contracts detail for accident years not separately presented                    
Claims Development [Line Items]                    
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) $ 1,674                  
Specialty casualty                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 13,174                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 8,259                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 351                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 5,266                  
Specialty casualty | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 1,019 1,002 1,007 1,015 1,021 1,024 1,042 1,041 1,043 1,081
Total IBNR Plus Expected Development on Reported Claims $ 45                  
Cumulative Number of Reported Claims | claim 58,641                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 946 934 913 888 844 792 702 577 411 178
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 92.80%                  
Specialty casualty | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,035 1,036 1,046 1,069 1,090 1,101 1,116 1,122 1,131  
Total IBNR Plus Expected Development on Reported Claims $ 57                  
Cumulative Number of Reported Claims | claim 56,831                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 951 938 906 870 806 713 584 418 186  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 91.90%                  
Specialty casualty | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,149 1,139 1,139 1,162 1,189 1,204 1,221 1,211    
Total IBNR Plus Expected Development on Reported Claims $ 88                  
Cumulative Number of Reported Claims | claim 57,492                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,007 959 902 833 755 612 422 200    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 87.60%                  
Specialty casualty | Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,263 1,264 1,269 1,262 1,302 1,307 1,277      
Total IBNR Plus Expected Development on Reported Claims $ 137                  
Cumulative Number of Reported Claims | claim 59,615                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,046 991 901 794 649 475 210      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 82.80%                  
Specialty casualty | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,286 1,284 1,280 1,322 1,311 1,308        
Total IBNR Plus Expected Development on Reported Claims $ 178                  
Cumulative Number of Reported Claims | claim 60,028                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 994 913 795 651 455 212        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 77.30%                  
Specialty casualty | Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,232 1,232 1,258 1,329 1,352          
Total IBNR Plus Expected Development on Reported Claims $ 225                  
Cumulative Number of Reported Claims | claim 54,632                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 887 757 613 446 188          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 72.00%                  
Specialty casualty | Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,319 1,342 1,389 1,384            
Total IBNR Plus Expected Development on Reported Claims $ 349                  
Cumulative Number of Reported Claims | claim 56,929                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 794 625 438 191            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 60.20%                  
Specialty casualty | Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,516 1,503 1,475              
Total IBNR Plus Expected Development on Reported Claims $ 497                  
Cumulative Number of Reported Claims | claim 59,184                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 771 507 198              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 50.90%                  
Specialty casualty | Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,670 1,648                
Total IBNR Plus Expected Development on Reported Claims $ 764                  
Cumulative Number of Reported Claims | claim 62,764                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 596 248                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 35.70%                  
Specialty casualty | Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,685                  
Total IBNR Plus Expected Development on Reported Claims $ 1,067                  
Cumulative Number of Reported Claims | claim 55,113                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 267                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 15.80%                  
Specialty casualty | Excludes short-duration insurance contracts detail for accident years not separately presented                    
Claims Development [Line Items]                    
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) $ 4,915                  
Specialty financial                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 2,194                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 1,781                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) (8)                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 405                  
Specialty financial | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 133 133 135 136 138 145 153 158 160 156
Total IBNR Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | claim 37,631                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 132 133 134 134 134 132 133 129 110 72
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 99.20%                  
Specialty financial | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 172 172 173 170 174 182 187 184 179  
Total IBNR Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | claim 45,186                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 172 172 171 164 163 161 158 141 88  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 100.00%                  
Specialty financial | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 210 210 202 203 208 212 215 212    
Total IBNR Plus Expected Development on Reported Claims $ 5                  
Cumulative Number of Reported Claims | claim 48,843                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 196 194 192 193 194 186 169 120    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 93.30%                  
Specialty financial | Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 197 198 201 207 219 217 212      
Total IBNR Plus Expected Development on Reported Claims $ 5                  
Cumulative Number of Reported Claims | claim 46,813                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 193 193 192 188 187 163 112      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 98.00%                  
Specialty financial | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 178 182 186 191 198 194        
Total IBNR Plus Expected Development on Reported Claims $ 4                  
Cumulative Number of Reported Claims | claim 41,970                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 172 170 168 164 146 99        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 96.60%                  
Specialty financial | Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 191 193 202 215 231          
Total IBNR Plus Expected Development on Reported Claims $ 12                  
Cumulative Number of Reported Claims | claim 29,772                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 167 162 159 144 100          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 87.40%                  
Specialty financial | Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 179 187 201 223            
Total IBNR Plus Expected Development on Reported Claims $ 16                  
Cumulative Number of Reported Claims | claim 27,467                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 156 146 136 98            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 87.20%                  
Specialty financial | Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 222 234 243              
Total IBNR Plus Expected Development on Reported Claims $ 29                  
Cumulative Number of Reported Claims | claim 24,054                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 187 164 108              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 84.20%                  
Specialty financial | Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 329 310                
Total IBNR Plus Expected Development on Reported Claims $ 75                  
Cumulative Number of Reported Claims | claim 24,393                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 230 150                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 69.90%                  
Specialty financial | Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 383                  
Total IBNR Plus Expected Development on Reported Claims $ 157                  
Cumulative Number of Reported Claims | claim 20,590                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 176                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 46.00%                  
Specialty financial | Excludes short-duration insurance contracts detail for accident years not separately presented                    
Claims Development [Line Items]                    
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) $ 413                  
Other specialty                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 1,310                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 736                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 23                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 597                  
Other specialty | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 88 87 87 84 82 76 66 63 60 59
Total IBNR Plus Expected Development on Reported Claims $ 2                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 84 81 76 75 69 62 50 31 26 $ 10
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 95.50%                  
Other specialty | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 77 77 78 77 76 71 65 61 61  
Total IBNR Plus Expected Development on Reported Claims $ 6                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 68 66 64 60 53 47 31 19 $ 9  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 88.30%                  
Other specialty | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 107 97 95 88 81 70 65 63    
Total IBNR Plus Expected Development on Reported Claims $ 7                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 93 83 76 63 52 30 19 $ 10    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 86.90%                  
Other specialty | Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 113 111 100 94 92 90 86      
Total IBNR Plus Expected Development on Reported Claims $ 14                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 87 77 60 44 32 23 $ 12      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 77.00%                  
Other specialty | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 134 119 111 108 107 108        
Total IBNR Plus Expected Development on Reported Claims $ 20                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 95 79 61 49 24 $ 9        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 70.90%                  
Other specialty | Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 141 126 129 117 122          
Total IBNR Plus Expected Development on Reported Claims $ 29                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 93 66 44 21 $ 9          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 66.00%                  
Other specialty | Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 143 138 141 135            
Total IBNR Plus Expected Development on Reported Claims $ 52                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 73 49 27 $ 8            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 51.00%                  
Other specialty | Accident Year 2022                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 153 152 159              
Total IBNR Plus Expected Development on Reported Claims $ 72                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 67 35 $ 11              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 43.80%                  
Other specialty | Accident Year 2023                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 189 201                
Total IBNR Plus Expected Development on Reported Claims $ 104                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 59 $ 29                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 31.20%                  
Other specialty | Accident Year 2024                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 165                  
Total IBNR Plus Expected Development on Reported Claims $ 132                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 17                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 10.30%                  
Other specialty | Excludes short-duration insurance contracts detail for accident years not separately presented                    
Claims Development [Line Items]                    
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) $ 574