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Insurance - Short-duration insurance contracts, claims development (Details) - Property and casualty insurance
$ in Millions
Dec. 31, 2021
USD ($)
claim
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 22,651                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 16,632                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 436                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 6,455                  
Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 1,866 $ 1,875 $ 1,886 $ 1,906 $ 1,941 $ 1,955 $ 1,947 $ 1,946 $ 1,952 $ 1,970
Total IBNR Plus Expected Development on Reported Claims $ 29                  
Cumulative Number of Reported Claims | claim 219,065                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,815 1,805 1,788 1,785 1,735 1,675 1,579 1,418 1,214 824
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 97.30%                  
Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,948 1,956 1,969 1,982 2,000 1,996 2,000 2,011 2,036  
Total IBNR Plus Expected Development on Reported Claims $ 42                  
Cumulative Number of Reported Claims | claim 222,550                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,871 1,851 1,824 1,774 1,714 1,617 1,443 1,214 697  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 96.00%                  
Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,954 1,957 1,978 2,004 2,038 2,040 2,050 2,083    
Total IBNR Plus Expected Development on Reported Claims $ 64                  
Cumulative Number of Reported Claims | claim 219,626                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,847 1,812 1,773 1,705 1,588 1,422 1,174 594    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 94.50%                  
Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,003 2,013 2,022 2,038 2,041 2,047 2,114      
Total IBNR Plus Expected Development on Reported Claims $ 85                  
Cumulative Number of Reported Claims | claim 230,625                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 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 92.20%                  
Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,004 2,034 2,060 2,082 2,083 2,117        
Total IBNR Plus Expected Development on Reported Claims $ 156                  
Cumulative Number of Reported Claims | claim 222,755                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,750 1,662 1,539 1,350 1,099 577        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 87.30%                  
Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,269 2,301 2,329 2,348 2,375          
Total IBNR Plus Expected Development on Reported Claims $ 239                  
Cumulative Number of Reported Claims | claim 246,470                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,844 1,736 1,524 1,250 709          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 81.30%                  
Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,439 2,499 2,516 2,507            
Total IBNR Plus Expected Development on Reported Claims $ 382                  
Cumulative Number of Reported Claims | claim 235,776                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,807 1,606 1,337 730            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 74.10%                  
Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,672 2,674 2,721              
Total IBNR Plus Expected Development on Reported Claims $ 574                  
Cumulative Number of Reported Claims | claim 253,599                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,768 1,448 847              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 66.20%                  
Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,635 2,748                
Total IBNR Plus Expected Development on Reported Claims $ 898                  
Cumulative Number of Reported Claims | claim 202,683                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,337 758                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 50.70%                  
Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,861                  
Total IBNR Plus Expected Development on Reported Claims $ 1,531                  
Cumulative Number of Reported Claims | claim 179,651                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 746                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 26.10%                  
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) $ 6,019                  
Property and transportation                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 8,841                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 7,546                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 23                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 1,318                  
Property and transportation | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 877 879 881 886 890 894 883 871 857 864
Total IBNR Plus Expected Development on Reported Claims $ 3                  
Cumulative Number of Reported Claims | claim 143,144                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 873 872 869 882 856 842 816 772 708 572
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 99.50%                  
Property and transportation | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 870 871 873 877 878 878 872 870 882  
Total IBNR Plus Expected Development on Reported Claims $ 5                  
Cumulative Number of Reported Claims | claim 138,947                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 861 860 858 847 831 804 760 702 438  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 99.00%                  
Property and transportation | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 802 804 808 815 820 817 828 844    
Total IBNR Plus Expected Development on Reported Claims $ 6                  
Cumulative Number of Reported Claims | claim 133,218                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 791 789 783 770 744 693 632 329    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 98.60%                  
Property and transportation | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 768 772 777 777 779 784 818      
Total IBNR Plus Expected Development on Reported Claims $ 9                  
Cumulative Number of Reported Claims | claim 134,923                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 750 744 736 707 667 582 359      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 97.70%                  
Property and transportation | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 688 694 706 714 716 746        
Total IBNR Plus Expected Development on Reported Claims $ 15                  
Cumulative Number of Reported Claims | claim 121,191                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 656 640 618 577 521 294        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 95.30%                  
Property and transportation | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 816 823 843 847 889          
Total IBNR Plus Expected Development on Reported Claims $ 19                  
Cumulative Number of Reported Claims | claim 140,714                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 755 735 696 640 379          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 92.50%                  
Property and transportation | Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 876 886 902 932            
Total IBNR Plus Expected Development on Reported Claims $ 35                  
Cumulative Number of Reported Claims | claim 130,271                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 781 738 676 396            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 89.20%                  
Property and transportation | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,051 1,058 1,111              
Total IBNR Plus Expected Development on Reported Claims $ 65                  
Cumulative Number of Reported Claims | claim 153,560                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 904 823 527              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 86.00%                  
Property and transportation | Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 974 1,043                
Total IBNR Plus Expected Development on Reported Claims $ 138                  
Cumulative Number of Reported Claims | claim 120,696                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 726 461                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 74.50%                  
Property and transportation | Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,119                  
Total IBNR Plus Expected Development on Reported Claims $ 397                  
Cumulative Number of Reported Claims | claim 108,153                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 449                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 40.10%                  
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) $ 1,295                  
Specialty casualty                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 11,217                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 7,153                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 383                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 4,447                  
Specialty casualty | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 826 833 842 849 877 883 885 885 892 901
Total IBNR Plus Expected Development on Reported Claims $ 23                  
Cumulative Number of Reported Claims | claim 54,827                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 783 775 761 745 723 684 621 516 385 173
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 94.80%                  
Specialty casualty | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 898 905 916 926 945 940 945 949 968  
Total IBNR Plus Expected Development on Reported Claims $ 35                  
Cumulative Number of Reported Claims | claim 55,128                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 835 820 797 766 729 666 554 396 182  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 93.00%                  
Specialty casualty | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 950 952 967 982 1,006 1,008 1,008 1,035    
Total IBNR Plus Expected Development on Reported Claims $ 50                  
Cumulative Number of Reported Claims | claim 56,942                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 862 829 801 755 680 574 412 190    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 90.70%                  
Specialty casualty | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,015 1,021 1,024 1,042 1,041 1,043 1,081      
Total IBNR Plus Expected Development on Reported Claims $ 67                  
Cumulative Number of Reported Claims | claim 58,076                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 888 844 792 702 577 411 178      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 87.50%                  
Specialty casualty | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,069 1,090 1,101 1,116 1,122 1,131        
Total IBNR Plus Expected Development on Reported Claims $ 124                  
Cumulative Number of Reported Claims | claim 56,407                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 870 806 713 584 418 186        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 81.40%                  
Specialty casualty | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,162 1,189 1,204 1,221 1,211          
Total IBNR Plus Expected Development on Reported Claims $ 200                  
Cumulative Number of Reported Claims | claim 56,975                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 833 755 612 422 200          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 71.70%                  
Specialty casualty | Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,262 1,302 1,307 1,277            
Total IBNR Plus Expected Development on Reported Claims $ 297                  
Cumulative Number of Reported Claims | claim 58,808                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 794 649 475 210            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 62.90%                  
Specialty casualty | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,322 1,311 1,308              
Total IBNR Plus Expected Development on Reported Claims $ 442                  
Cumulative Number of Reported Claims | claim 58,304                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 651 455 212              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 49.20%                  
Specialty casualty | Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,329 1,352                
Total IBNR Plus Expected Development on Reported Claims $ 631                  
Cumulative Number of Reported Claims | claim 52,733                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 446 188                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 33.60%                  
Specialty casualty | Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,384                  
Total IBNR Plus Expected Development on Reported Claims $ 907                  
Cumulative Number of Reported Claims | claim 48,149                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 191                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 13.80%                  
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) $ 4,064                  
Specialty financial                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 1,726                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 1,468                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) (2)                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 256                  
Specialty financial | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 125 126 127 132 135 137 139 151 163 163
Total IBNR Plus Expected Development on Reported Claims $ 1                  
Cumulative Number of Reported Claims | claim 21,094                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 125 125 126 128 126 121 117 109 104 71
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 100.00%                  
Specialty financial | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 120 122 122 126 127 131 137 145 140  
Total IBNR Plus Expected Development on Reported Claims $ 1                  
Cumulative Number of Reported Claims | claim 28,475                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 118 118 118 117 117 113 107 100 70  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 98.30%                  
Specialty financial | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 136 137 142 147 153 156 157 146    
Total IBNR Plus Expected Development on Reported Claims $ 1                  
Cumulative Number of Reported Claims | claim 29,466                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 140 141 139 137 128 125 109 62    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 102.90%                  
Specialty financial | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 136 138 145 153 158 160 156      
Total IBNR Plus Expected Development on Reported Claims $ 2                  
Cumulative Number of Reported Claims | claim 37,626                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 134 134 132 133 129 110 72      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 98.50%                  
Specialty financial | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 170 174 182 187 184 179        
Total IBNR Plus Expected Development on Reported Claims $ 4                  
Cumulative Number of Reported Claims | claim 45,157                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 164 163 161 158 141 88        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 96.50%                  
Specialty financial | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 203 208 212 215 212          
Total IBNR Plus Expected Development on Reported Claims $ 8                  
Cumulative Number of Reported Claims | claim 48,781                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 193 194 186 169 120          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 95.10%                  
Specialty financial | Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 207 219 217 212            
Total IBNR Plus Expected Development on Reported Claims $ 15                  
Cumulative Number of Reported Claims | claim 46,697                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 188 187 163 112            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 90.80%                  
Specialty financial | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 191 198 194              
Total IBNR Plus Expected Development on Reported Claims $ 23                  
Cumulative Number of Reported Claims | claim 41,735                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 164 146 99              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 85.90%                  
Specialty financial | Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 215 231                
Total IBNR Plus Expected Development on Reported Claims $ 49                  
Cumulative Number of Reported Claims | claim 29,254                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 144 100                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 67.00%                  
Specialty financial | Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 223                  
Total IBNR Plus Expected Development on Reported Claims $ 110                  
Cumulative Number of Reported Claims | claim 23,349                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 98                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 43.90%                  
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) $ 258                  
Other specialty                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 867                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 465                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 32                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 434                  
Other specialty | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 38 37 36 39 39 41 40 39 40 42
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 $ 34 33 32 30 30 28 25 21 17 $ 8
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 89.50%                  
Other specialty | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 60 58 58 53 50 47 46 47 46  
Total IBNR Plus Expected Development on Reported Claims $ 1                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 57 53 51 44 37 34 22 16 $ 7  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 95.00%                  
Other specialty | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 66 64 61 60 59 59 57 58    
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 $ 54 53 50 43 36 30 21 $ 13    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 81.80%                  
Other specialty | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 84 82 76 66 63 60 59      
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 $ 75 69 62 50 31 26 $ 10      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 89.30%                  
Other specialty | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 77 76 71 65 61 61        
Total IBNR Plus Expected Development on Reported Claims $ 13                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 60 53 47 31 19 $ 9        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 77.90%                  
Other specialty | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 88 81 70 65 63          
Total IBNR Plus Expected Development on Reported Claims $ 12                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 63 52 30 19 $ 10          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 71.60%                  
Other specialty | Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 94 92 90 86            
Total IBNR Plus Expected Development on Reported Claims $ 35                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 44 32 23 $ 12            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 46.80%                  
Other specialty | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 108 107 108              
Total IBNR Plus Expected Development on Reported Claims $ 44                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 49 24 $ 9              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 45.40%                  
Other specialty | Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 117 122                
Total IBNR Plus Expected Development on Reported Claims $ 80                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 21 $ 9                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 17.90%                  
Other specialty | Accident Year 2021                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 135                  
Total IBNR Plus Expected Development on Reported Claims $ 117                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 8                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 5.90%                  
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) $ 402