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Insurance - Short-duration insurance contracts, claims development (Details) - Property and casualty insurance
$ in Millions
Dec. 31, 2020
USD ($)
claim
Dec. 31, 2019
USD ($)
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 ($)
Dec. 31, 2011
USD ($)
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 21,886                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 16,231                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 467                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 6,122                  
Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 1,829 $ 1,832 $ 1,843 $ 1,859 $ 1,866 $ 1,861 $ 1,871 $ 1,849 $ 1,848 $ 1,840
Total IBNR Plus Expected Development on Reported Claims $ 35                  
Cumulative Number of Reported Claims | claim 209,666                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,762 1,750 1,734 1,711 1,682 1,629 1,534 1,389 1,181 609
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 96.30%                  
Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 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 $ 43                  
Cumulative Number of Reported Claims | claim 218,995                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 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 96.30%                  
Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,956 1,969 1,982 2,000 1,996 2,000 2,011 2,036    
Total IBNR Plus Expected Development on Reported Claims $ 65                  
Cumulative Number of Reported Claims | claim 222,463                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 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 94.60%                  
Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,957 1,978 2,004 2,038 2,040 2,050 2,083      
Total IBNR Plus Expected Development on Reported Claims $ 88                  
Cumulative Number of Reported Claims | claim 219,309                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 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 92.60%                  
Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,013 2,022 2,038 2,041 2,047 2,114        
Total IBNR Plus Expected Development on Reported Claims $ 125                  
Cumulative Number of Reported Claims | claim 230,235                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,791 1,722 1,592 1,404 1,129 619        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 89.00%                  
Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,034 2,060 2,082 2,083 2,117          
Total IBNR Plus Expected Development on Reported Claims $ 213                  
Cumulative Number of Reported Claims | claim 222,410                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,662 1,539 1,350 1,099 577          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 81.70%                  
Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,301 2,329 2,348 2,375            
Total IBNR Plus Expected Development on Reported Claims $ 342                  
Cumulative Number of Reported Claims | claim 245,799                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,736 1,524 1,250 709            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 75.40%                  
Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,499 2,516 2,507              
Total IBNR Plus Expected Development on Reported Claims $ 552                  
Cumulative Number of Reported Claims | claim 234,457                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,606 1,337 730              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 64.30%                  
Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,674 2,721                
Total IBNR Plus Expected Development on Reported Claims $ 797                  
Cumulative Number of Reported Claims | claim 250,429                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,448 847                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 54.20%                  
Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,748                  
Total IBNR Plus Expected Development on Reported Claims $ 1,410                  
Cumulative Number of Reported Claims | claim 182,219                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 758                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 27.60%                  
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) $ 5,655                  
Property and transportation                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 8,673                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 7,497                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 20                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 1,196                  
Property and transportation | Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 843 843 844 846 850 837 827 813 799 811
Total IBNR Plus Expected Development on Reported Claims $ 4                  
Cumulative Number of Reported Claims | claim 138,334                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 835 834 833 829 821 803 771 727 667 365
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 99.10%                  
Property and transportation | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 879 881 886 890 894 883 871 857 864  
Total IBNR Plus Expected Development on Reported Claims $ 4                  
Cumulative Number of Reported Claims | claim 143,151                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 872 869 882 856 842 816 772 708 572  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 99.20%                  
Property and transportation | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 871 873 877 878 878 872 870 882    
Total IBNR Plus Expected Development on Reported Claims $ 7                  
Cumulative Number of Reported Claims | claim 138,925                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 860 858 847 831 804 760 702 438    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 98.70%                  
Property and transportation | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 804 808 815 820 817 828 844      
Total IBNR Plus Expected Development on Reported Claims $ 8                  
Cumulative Number of Reported Claims | claim 133,182                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 789 783 770 744 693 632 329      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 98.10%                  
Property and transportation | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 772 777 777 779 784 818        
Total IBNR Plus Expected Development on Reported Claims $ 15                  
Cumulative Number of Reported Claims | claim 134,875                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 744 736 707 667 582 359        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 96.40%                  
Property and transportation | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 694 706 714 716 746          
Total IBNR Plus Expected Development on Reported Claims $ 25                  
Cumulative Number of Reported Claims | claim 121,116                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 640 618 577 521 294          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 92.20%                  
Property and transportation | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 823 843 847 889            
Total IBNR Plus Expected Development on Reported Claims $ 39                  
Cumulative Number of Reported Claims | claim 140,549                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 735 696 640 379            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 89.30%                  
Property and transportation | Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 886 902 932              
Total IBNR Plus Expected Development on Reported Claims $ 69                  
Cumulative Number of Reported Claims | claim 129,891                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 738 676 396              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 83.30%                  
Property and transportation | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,058 1,111                
Total IBNR Plus Expected Development on Reported Claims $ 125                  
Cumulative Number of Reported Claims | claim 152,304                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 823 527                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 77.80%                  
Property and transportation | Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,043                  
Total IBNR Plus Expected Development on Reported Claims $ 349                  
Cumulative Number of Reported Claims | claim 109,446                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 461                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 44.20%                  
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) $ 1,176                  
Specialty casualty                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 10,763                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 6,876                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 415                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 4,302                  
Specialty casualty | Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 808 810 817 826 828 834 848 839 849 852
Total IBNR Plus Expected Development on Reported Claims $ 29                  
Cumulative Number of Reported Claims | claim 54,961                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 755 745 731 714 694 662 612 522 383 174
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 93.40%                  
Specialty casualty | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 833 842 849 877 883 885 885 892 901  
Total IBNR Plus Expected Development on Reported Claims $ 35                  
Cumulative Number of Reported Claims | claim 54,752                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 775 761 745 723 684 621 516 385 173  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 93.00%                  
Specialty casualty | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 905 916 926 945 940 945 949 968    
Total IBNR Plus Expected Development on Reported Claims $ 53                  
Cumulative Number of Reported Claims | claim 55,063                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 820 797 766 729 666 554 396 182    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 90.60%                  
Specialty casualty | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 952 967 982 1,006 1,008 1,008 1,035      
Total IBNR Plus Expected Development on Reported Claims $ 71                  
Cumulative Number of Reported Claims | claim 56,669                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 829 801 755 680 574 412 190      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 87.10%                  
Specialty casualty | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,021 1,024 1,042 1,041 1,043 1,081        
Total IBNR Plus Expected Development on Reported Claims $ 99                  
Cumulative Number of Reported Claims | claim 57,745                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 844 792 702 577 411 178        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 82.70%                  
Specialty casualty | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,090 1,101 1,116 1,122 1,131          
Total IBNR Plus Expected Development on Reported Claims $ 164                  
Cumulative Number of Reported Claims | claim 56,169                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 806 713 584 418 186          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 73.90%                  
Specialty casualty | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,189 1,204 1,221 1,211            
Total IBNR Plus Expected Development on Reported Claims $ 275                  
Cumulative Number of Reported Claims | claim 56,558                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 755 612 422 200            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 63.50%                  
Specialty casualty | Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,302 1,307 1,277              
Total IBNR Plus Expected Development on Reported Claims $ 416                  
Cumulative Number of Reported Claims | claim 58,079                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 649 475 210              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 49.80%                  
Specialty casualty | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,311 1,308                
Total IBNR Plus Expected Development on Reported Claims $ 571                  
Cumulative Number of Reported Claims | claim 56,950                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 455 212                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 34.70%                  
Specialty casualty | Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,352                  
Total IBNR Plus Expected Development on Reported Claims $ 844                  
Cumulative Number of Reported Claims | claim 48,294                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 188                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 13.90%                  
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) $ 3,887                  
Specialty financial                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 1,690                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 1,441                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) (2)                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 247                  
Specialty financial | Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 137 137 139 143 144 147 153 155 157 138
Total IBNR Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | claim 16,371                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 133 132 132 131 131 130 123 115 111 58
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 97.10%                  
Specialty financial | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 126 127 132 135 137 139 151 163 163  
Total IBNR Plus Expected Development on Reported Claims $ 2                  
Cumulative Number of Reported Claims | claim 21,092                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 125 126 128 126 121 117 109 104 71  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 99.20%                  
Specialty financial | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 122 122 126 127 131 137 145 140    
Total IBNR Plus Expected Development on Reported Claims $ 4                  
Cumulative Number of Reported Claims | claim 28,475                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 118 118 117 117 113 107 100 70    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 96.70%                  
Specialty financial | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 137 142 147 153 156 157 146      
Total IBNR Plus Expected Development on Reported Claims $ 2                  
Cumulative Number of Reported Claims | claim 29,458                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 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 $ 138 145 153 158 160 156        
Total IBNR Plus Expected Development on Reported Claims $ 4                  
Cumulative Number of Reported Claims | claim 37,615                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 134 132 133 129 110 72        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 97.10%                  
Specialty financial | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 174 182 187 184 179          
Total IBNR Plus Expected Development on Reported Claims $ 8                  
Cumulative Number of Reported Claims | claim 45,125                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 163 161 158 141 88          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 93.70%                  
Specialty financial | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 208 212 215 212            
Total IBNR Plus Expected Development on Reported Claims $ 15                  
Cumulative Number of Reported Claims | claim 48,692                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 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 $ 219 217 212              
Total IBNR Plus Expected Development on Reported Claims $ 27                  
Cumulative Number of Reported Claims | claim 46,487                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 187 163 112              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 85.40%                  
Specialty financial | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 198 194                
Total IBNR Plus Expected Development on Reported Claims $ 37                  
Cumulative Number of Reported Claims | claim 41,175                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 146 99                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 73.70%                  
Specialty financial | Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 231                  
Total IBNR Plus Expected Development on Reported Claims $ 115                  
Cumulative Number of Reported Claims | claim 24,479                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 100                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 43.30%                  
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) $ 249                  
Other specialty                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 760                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 417                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 34                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 377                  
Other specialty | Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 41 42 43 44 44 43 43 42 43 39
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 $ 39 39 38 37 36 34 28 25 20 $ 12
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 95.10%                  
Other specialty | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 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 $ 33 32 30 30 28 25 21 17 $ 8  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 89.20%                  
Other specialty | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 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 $ 53 51 44 37 34 22 16 $ 7    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 91.40%                  
Other specialty | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 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 $ 53 50 43 36 30 21 $ 13      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 82.80%                  
Other specialty | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 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 $ 69 62 50 31 26 $ 10        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 84.10%                  
Other specialty | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 76 71 65 61 61          
Total IBNR Plus Expected Development on Reported Claims $ 16                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 53 47 31 19 $ 9          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 69.70%                  
Other specialty | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 81 70 65 63            
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 $ 52 30 19 $ 10            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 64.20%                  
Other specialty | Accident Year 2018                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 92 90 86              
Total IBNR Plus Expected Development on Reported Claims $ 40                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 32 23 $ 12              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 34.80%                  
Other specialty | Accident Year 2019                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 107 108                
Total IBNR Plus Expected Development on Reported Claims $ 64                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 24 $ 9                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 22.40%                  
Other specialty | Accident year 2020                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 122                  
Total IBNR Plus Expected Development on Reported Claims $ 102                  
Cumulative Number of Reported Claims | claim 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 9                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance 7.40%                  
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) $ 343