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Insurance - Short-duration insurance contracts, claims development (Details) - Property and casualty insurance
$ in Millions
Dec. 31, 2017
USD ($)
claim
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 19,503                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 14,838                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 533                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 5,198                  
Accident Year 2008                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 1,950 $ 1,951 $ 1,947 $ 1,953 $ 1,955 $ 1,978 $ 1,971 $ 1,987 $ 2,018 $ 2,067
Total IBNR Plus Expected Development on Reported Claims $ 46                  
Cumulative Number of Reported Claims | claim 244,447                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,866 1,847 1,828 1,803 1,765 1,701 1,607 1,459 1,230 627
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 95.70%                  
Accident Year 2009                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,529 1,539 1,543 1,545 1,552 1,566 1,596 1,607 1,624  
Total IBNR Plus Expected Development on Reported Claims $ 58                  
Cumulative Number of Reported Claims | claim 221,165                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,435 1,424 1,404 1,370 1,308 1,216 1,079 871 509  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 93.90%                  
Accident Year 2010                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,690 1,698 1,698 1,710 1,690 1,705 1,710 1,724    
Total IBNR Plus Expected Development on Reported Claims $ 75                  
Cumulative Number of Reported Claims | claim 215,418                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,580 1,562 1,536 1,485 1,387 1,220 1,005 576    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 93.50%                  
Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,859 1,866 1,861 1,871 1,849 1,848 1,840      
Total IBNR Plus Expected Development on Reported Claims $ 98                  
Cumulative Number of Reported Claims | claim 207,643                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 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 [1] 92.00%                  
Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,941 1,955 1,947 1,946 1,952 1,970        
Total IBNR Plus Expected Development on Reported Claims $ 142                  
Cumulative Number of Reported Claims | claim 217,516                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,735 1,675 1,579 1,418 1,214 824        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 89.40%                  
Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,000 1,996 2,000 2,011 2,036          
Total IBNR Plus Expected Development on Reported Claims $ 168                  
Cumulative Number of Reported Claims | claim 219,940                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,714 1,617 1,443 1,214 697          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 85.70%                  
Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,038 2,040 2,050 2,083            
Total IBNR Plus Expected Development on Reported Claims $ 272                  
Cumulative Number of Reported Claims | claim 218,032                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,588 1,422 1,173 594            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 77.90%                  
Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,040 2,046 2,114              
Total IBNR Plus Expected Development on Reported Claims $ 363                  
Cumulative Number of Reported Claims | claim 225,000                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,403 1,128 619              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 68.80%                  
Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,082 2,116                
Total IBNR Plus Expected Development on Reported Claims $ 593                  
Cumulative Number of Reported Claims | claim 216,248                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,098 576                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 52.70%                  
Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,374                  
Total IBNR Plus Expected Development on Reported Claims $ 1,119                  
Cumulative Number of Reported Claims | claim 210,970                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 708                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 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) $ 4,665                  
Property and transportation                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 8,029                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 6,980                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 20                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 1,069                  
Property and transportation | Accident Year 2008                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 854 854 856 855 854 856 853 852 871 923
Total IBNR Plus Expected Development on Reported Claims $ 1                  
Cumulative Number of Reported Claims | claim 157,164                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 848 847 846 846 835 824 799 761 706 352
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 99.30%                  
Property and transportation | Accident Year 2009                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 508 508 508 511 511 516 523 506 526  
Total IBNR Plus Expected Development on Reported Claims $ 3                  
Cumulative Number of Reported Claims | claim 140,532                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 502 499 497 493 479 456 413 348 229  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 98.80%                  
Property and transportation | Accident Year 2010                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 680 683 679 679 676 668 662 702    
Total IBNR Plus Expected Development on Reported Claims $ 6                  
Cumulative Number of Reported Claims | claim 140,634                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 669 665 660 649 618 556 505 328    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 98.40%                  
Property and transportation | Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 865 868 856 845 831 816 830      
Total IBNR Plus Expected Development on Reported Claims $ 10                  
Cumulative Number of Reported Claims | claim 140,418                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 847 840 821 787 742 679 373      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 97.90%                  
Property and transportation | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 918 922 909 897 884 890        
Total IBNR Plus Expected Development on Reported Claims $ 19                  
Cumulative Number of Reported Claims | claim 146,630                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 883 868 841 793 725 582        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 96.20%                  
Property and transportation | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 910 908 902 898 911          
Total IBNR Plus Expected Development on Reported Claims $ 22                  
Cumulative Number of Reported Claims | claim 142,249                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 862 831 784 721 449          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 94.70%                  
Property and transportation | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 843 841 852 868            
Total IBNR Plus Expected Development on Reported Claims $ 38                  
Cumulative Number of Reported Claims | claim 136,882                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 765 711 646 337            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 90.70%                  
Property and transportation | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 798 804 842              
Total IBNR Plus Expected Development on Reported Claims $ 54                  
Cumulative Number of Reported Claims | claim 135,029                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 683 595 367              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 85.60%                  
Property and transportation | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 740 771                
Total IBNR Plus Expected Development on Reported Claims $ 110                  
Cumulative Number of Reported Claims | claim 122,112                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 534 299                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 72.20%                  
Property and transportation | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 913                  
Total IBNR Plus Expected Development on Reported Claims $ 273                  
Cumulative Number of Reported Claims | claim 128,455                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 387                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 42.40%                  
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) $ 1,049                  
Specialty casualty                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 9,355                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 6,155                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 430                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 3,630                  
Specialty casualty | Accident Year 2008                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 854 855 849 855 856 871 860 874 891 905
Total IBNR Plus Expected Development on Reported Claims $ 41                  
Cumulative Number of Reported Claims | claim 59,991                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 782 768 751 727 702 653 588 490 355 162
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 91.60%                  
Specialty casualty | Accident Year 2009                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 803 807 812 811 816 826 845 867 864  
Total IBNR Plus Expected Development on Reported Claims $ 48                  
Cumulative Number of Reported Claims | claim 53,192                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 722 713 698 673 636 575 494 366 160  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 89.90%                  
Specialty casualty | Accident Year 2010                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 842 845 846 856 842 864 863 847    
Total IBNR Plus Expected Development on Reported Claims $ 65                  
Cumulative Number of Reported Claims | claim 52,855                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 748 734 712 676 623 539 393 179    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 88.80%                  
Specialty casualty | Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 806 808 814 828 819 831 831      
Total IBNR Plus Expected Development on Reported Claims $ 73                  
Cumulative Number of Reported Claims | claim 50,851                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 694 674 643 595 506 369 165      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 86.10%                  
Specialty casualty | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 849 855 859 859 865 874        
Total IBNR Plus Expected Development on Reported Claims $ 104                  
Cumulative Number of Reported Claims | claim 49,836                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 696 658 596 495 368 163        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 82.00%                  
Specialty casualty | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 913 910 915 921 938          
Total IBNR Plus Expected Development on Reported Claims $ 132                  
Cumulative Number of Reported Claims | claim 49,412                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 698 638 530 377 171          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 76.50%                  
Specialty casualty | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 982 984 984 1,011            
Total IBNR Plus Expected Development on Reported Claims $ 202                  
Cumulative Number of Reported Claims | claim 52,167                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 659 556 398 182            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 67.10%                  
Specialty casualty | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,022 1,023 1,057              
Total IBNR Plus Expected Development on Reported Claims $ 268                  
Cumulative Number of Reported Claims | claim 52,846                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 560 398 170              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 54.80%                  
Specialty casualty | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,098 1,105                
Total IBNR Plus Expected Development on Reported Claims $ 426                  
Cumulative Number of Reported Claims | claim 50,652                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 404 181                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 36.80%                  
Specialty casualty | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,186                  
Total IBNR Plus Expected Development on Reported Claims $ 715                  
Cumulative Number of Reported Claims | claim 46,399                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 192                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 16.20%                  
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) $ 3,200                  
Specialty financial                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 1,624                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 1,403                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 0                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 221                  
Specialty financial | Accident Year 2008                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 199 198 197 198 199 203 209 212 207 190
Total IBNR Plus Expected Development on Reported Claims $ 1                  
Cumulative Number of Reported Claims | claim 27,292                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 197 194 194 193 191 189 189 185 153 103
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 99.00%                  
Specialty financial | Accident Year 2009                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 185 186 187 186 188 184 187 193 193  
Total IBNR Plus Expected Development on Reported Claims $ 0                  
Cumulative Number of Reported Claims | claim 27,441                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 186 186 185 182 171 166 157 145 112  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 100.50%                  
Specialty financial | Accident Year 2010                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 128 130 133 135 133 133 146 139    
Total IBNR Plus Expected Development on Reported Claims $ 2                  
Cumulative Number of Reported Claims | claim 21,929                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 127 128 131 133 122 104 93 61    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 99.20%                  
Specialty financial | Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 144 146 148 155 157 158 140      
Total IBNR Plus Expected Development on Reported Claims $ 11                  
Cumulative Number of Reported Claims | claim 16,374                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 133 132 131 124 116 113 59      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 92.40%                  
Specialty financial | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 135 137 139 151 163 164        
Total IBNR Plus Expected Development on Reported Claims $ 11                  
Cumulative Number of Reported Claims | claim 21,050                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 126 121 117 109 104 71        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 93.30%                  
Specialty financial | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 127 131 137 145 141          
Total IBNR Plus Expected Development on Reported Claims $ 9                  
Cumulative Number of Reported Claims | claim 28,279                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 117 114 107 100 70          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 92.10%                  
Specialty financial | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 154 156 157 146            
Total IBNR Plus Expected Development on Reported Claims $ 16                  
Cumulative Number of Reported Claims | claim 28,983                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 128 125 108 62            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 83.10%                  
Specialty financial | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 157 159 156              
Total IBNR Plus Expected Development on Reported Claims $ 21                  
Cumulative Number of Reported Claims | claim 37,125                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 129 109 72              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 82.20%                  
Specialty financial | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 183 179                
Total IBNR Plus Expected Development on Reported Claims $ 26                  
Cumulative Number of Reported Claims | claim 43,484                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 141 87                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 77.00%                  
Specialty financial | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 212                  
Total IBNR Plus Expected Development on Reported Claims $ 84                  
Cumulative Number of Reported Claims | claim 36,116                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 119                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 56.10%                  
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) $ 221                  
Other specialty                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 495                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 300                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 83                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 278                  
Other specialty | Accident Year 2008                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 43 44 45 45 46 48 49 49 49 49
Total IBNR Plus Expected Development on Reported Claims $ 3                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 39 38 37 37 37 35 31 23 16 $ 10
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 90.70%                  
Other specialty | Accident Year 2009                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 33 38 36 37 37 40 41 41 41  
Total IBNR Plus Expected Development on Reported Claims $ 7                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 25 26 24 22 22 19 15 12 $ 8  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 75.80%                  
Other specialty | Accident Year 2010                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 40 40 40 40 39 40 39 36    
Total IBNR Plus Expected Development on Reported Claims $ 2                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 36 35 33 27 24 21 14 $ 8    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 90.00%                  
Other specialty | Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 44 44 43 43 42 43 39      
Total IBNR Plus Expected Development on Reported Claims $ 4                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 37 36 34 28 25 20 $ 12      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 84.10%                  
Other specialty | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 39 41 40 39 40 42        
Total IBNR Plus Expected Development on Reported Claims $ 8                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 30 28 25 21 17 $ 8        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 76.90%                  
Other specialty | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 50 47 46 47 46          
Total IBNR Plus Expected Development on Reported Claims $ 5                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 37 34 22 16 $ 7          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 74.00%                  
Other specialty | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 59 59 57 58            
Total IBNR Plus Expected Development on Reported Claims $ 16                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 36 30 21 $ 13            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 61.00%                  
Other specialty | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 63 60 59              
Total IBNR Plus Expected Development on Reported Claims $ 20                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 31 26 $ 10              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 49.20%                  
Other specialty | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 61 61                
Total IBNR Plus Expected Development on Reported Claims $ 31                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 19 $ 9                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 31.10%                  
Other specialty | Accident Year 2017                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 63                  
Total IBNR Plus Expected Development on Reported Claims $ 47                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 10                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 15.90%                  
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) $ 195                  
[1] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2017).
[2] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2017).
[3] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2017).
[4] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2017).
[5] The amounts shown in Other specialty represent business assumed by AFG’s internal reinsurance program from the operations that make up AFG’s other Specialty property and casualty insurance sub-segments. Accordingly, the liability for incurred claims and allocated LAE represents additional reserves held on claims counted in the tables provided for the other sub-segments (above).
[6] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2017).