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Insurance - Short-duration insurance contracts, claims development (Details) - Property and casualty insurance
$ in Millions
Dec. 31, 2016
USD ($)
claim
Dec. 31, 2015
USD ($)
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 ($)
Dec. 31, 2007
USD ($)
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 18,731                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 14,382                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 495                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 4,844 $ 4,600                
Accident Year 2007                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 1,537 1,543 $ 1,539 $ 1,565 $ 1,573 $ 1,585 $ 1,615 $ 1,670 $ 1,759 $ 1,908
Total IBNR Plus Expected Development on Reported Claims $ 52                  
Cumulative Number of Reported Claims | claim 211,219                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,453 1,444 1,425 1,405 1,370 1,313 1,234 1,107 931 538
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 94.50%                  
Accident Year 2008                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 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 $ 56                  
Cumulative Number of Reported Claims | claim 244,346                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 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] 94.70%                  
Accident Year 2009                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,539 1,543 1,545 1,552 1,566 1,596 1,607 1,624    
Total IBNR Plus Expected Development on Reported Claims $ 74                  
Cumulative Number of Reported Claims | claim 221,065                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 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] 92.50%                  
Accident Year 2010                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,698 1,698 1,710 1,690 1,705 1,710 1,724      
Total IBNR Plus Expected Development on Reported Claims $ 91                  
Cumulative Number of Reported Claims | claim 215,306                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 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] 92.00%                  
Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,866 1,861 1,871 1,849 1,848 1,840        
Total IBNR Plus Expected Development on Reported Claims $ 124                  
Cumulative Number of Reported Claims | claim 207,407                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,682 1,629 1,534 1,389 1,181 609        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 90.10%                  
Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,955 1,947 1,946 1,952 1,970          
Total IBNR Plus Expected Development on Reported Claims $ 176                  
Cumulative Number of Reported Claims | claim 217,345                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,675 1,579 1,418 1,214 824          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 85.70%                  
Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,996 2,000 2,011 2,036            
Total IBNR Plus Expected Development on Reported Claims $ 220                  
Cumulative Number of Reported Claims | claim 219,598                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,617 1,443 1,214 697            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 81.00%                  
Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,040 2,050 2,083              
Total IBNR Plus Expected Development on Reported Claims $ 373                  
Cumulative Number of Reported Claims | claim 217,836                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,422 1,173 594              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 69.70%                  
Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,044 2,112                
Total IBNR Plus Expected Development on Reported Claims $ 549                  
Cumulative Number of Reported Claims | claim 222,288                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 1,127 619                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 55.10%                  
Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 2,105                  
Total IBNR Plus Expected Development on Reported Claims $ 1,005                  
Cumulative Number of Reported Claims | claim 186,087                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 573                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [1] 27.20%                  
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) $ 4,349                  
Property and transportation                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 7,714                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 6,715                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 21                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 1,020 971                
Property and transportation | Accident Year 2007                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 568 568 568 569 569 572 572 577 595 657
Total IBNR Plus Expected Development on Reported Claims $ 1                  
Cumulative Number of Reported Claims | claim 126,900                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 564 563 562 559 553 539 523 492 450 284
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 99.30%                  
Property and transportation | Accident Year 2008                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 854 856 855 854 856 853 852 871 923  
Total IBNR Plus Expected Development on Reported Claims $ 3                  
Cumulative Number of Reported Claims | claim 157,173                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 847 846 846 835 824 799 761 706 352  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 99.20%                  
Property and transportation | Accident Year 2009                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 508 508 511 511 516 523 506 526    
Total IBNR Plus Expected Development on Reported Claims $ 4                  
Cumulative Number of Reported Claims | claim 140,530                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 499 497 493 479 456 413 348 229    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 98.20%                  
Property and transportation | Accident Year 2010                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 683 679 679 676 668 662 702      
Total IBNR Plus Expected Development on Reported Claims $ 10                  
Cumulative Number of Reported Claims | claim 140,614                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 665 660 649 618 556 505 328      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 97.40%                  
Property and transportation | Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 868 856 845 831 816 830        
Total IBNR Plus Expected Development on Reported Claims $ 16                  
Cumulative Number of Reported Claims | claim 140,408                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 840 821 787 742 679 373        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 96.80%                  
Property and transportation | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 922 909 897 884 890          
Total IBNR Plus Expected Development on Reported Claims $ 27                  
Cumulative Number of Reported Claims | claim 146,584                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 868 841 793 725 582          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 94.10%                  
Property and transportation | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 908 902 898 911            
Total IBNR Plus Expected Development on Reported Claims $ 40                  
Cumulative Number of Reported Claims | claim 142,139                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 831 784 721 449            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 91.50%                  
Property and transportation | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 841 852 868              
Total IBNR Plus Expected Development on Reported Claims $ 67                  
Cumulative Number of Reported Claims | claim 137,214                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 711 646 337              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 84.50%                  
Property and transportation | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 802 840                
Total IBNR Plus Expected Development on Reported Claims $ 106                  
Cumulative Number of Reported Claims | claim 134,407                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 594 367                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 74.10%                  
Property and transportation | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 760                  
Total IBNR Plus Expected Development on Reported Claims $ 250                  
Cumulative Number of Reported Claims | claim 109,187                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 296                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [2] 38.90%                  
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) $ 999                  
Specialty casualty                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 8,995                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 6,053                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 414                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 3,356 3,170                
Specialty casualty | Accident Year 2007                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 803 802 794 818 821 828 852 892 957 1,036
Total IBNR Plus Expected Development on Reported Claims $ 40                  
Cumulative Number of Reported Claims | claim 62,676                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 733 724 708 692 664 623 563 477 357 166
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 91.30%                  
Specialty casualty | Accident Year 2008                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 855 849 855 856 871 860 874 891 905  
Total IBNR Plus Expected Development on Reported Claims $ 48                  
Cumulative Number of Reported Claims | claim 59,886                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 768 751 727 702 653 588 490 355 162  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 89.80%                  
Specialty casualty | Accident Year 2009                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 807 812 811 816 826 845 867 864    
Total IBNR Plus Expected Development on Reported Claims $ 58                  
Cumulative Number of Reported Claims | claim 53,097                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 713 698 673 636 575 494 366 160    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 88.40%                  
Specialty casualty | Accident Year 2010                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 845 846 856 842 864 863 847      
Total IBNR Plus Expected Development on Reported Claims $ 74                  
Cumulative Number of Reported Claims | claim 52,771                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 734 712 676 623 539 393 179      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 86.90%                  
Specialty casualty | Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 808 814 828 819 831 831        
Total IBNR Plus Expected Development on Reported Claims $ 89                  
Cumulative Number of Reported Claims | claim 50,635                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 674 643 595 506 369 165        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 83.40%                  
Specialty casualty | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 855 859 859 865 874          
Total IBNR Plus Expected Development on Reported Claims $ 124                  
Cumulative Number of Reported Claims | claim 49,732                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 658 596 495 368 163          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 77.00%                  
Specialty casualty | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 910 915 921 938            
Total IBNR Plus Expected Development on Reported Claims $ 159                  
Cumulative Number of Reported Claims | claim 49,239                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 638 530 377 171            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 70.10%                  
Specialty casualty | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 984 984 1,011              
Total IBNR Plus Expected Development on Reported Claims $ 263                  
Cumulative Number of Reported Claims | claim 51,808                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 556 398 182              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 56.50%                  
Specialty casualty | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,023 1,057                
Total IBNR Plus Expected Development on Reported Claims $ 380                  
Cumulative Number of Reported Claims | claim 52,001                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 398 170                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 38.90%                  
Specialty casualty | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 1,105                  
Total IBNR Plus Expected Development on Reported Claims $ 636                  
Cumulative Number of Reported Claims | claim 47,436                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 181                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [3] 16.40%                  
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) $ 2,942                  
Specialty financial                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 1,558                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 1,331                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 1                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 228 219                
Specialty financial | Accident Year 2007                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 136 140 141 142 144 145 149 159 165 170
Total IBNR Plus Expected Development on Reported Claims $ 1                  
Cumulative Number of Reported Claims | claim 21,643                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 135 136 135 135 135 134 133 126 114 82
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 99.30%                  
Specialty financial | Accident Year 2008                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 198 197 198 199 203 209 212 207 190  
Total IBNR Plus Expected Development on Reported Claims $ 1                  
Cumulative Number of Reported Claims | claim 27,287                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 194 194 193 191 189 189 185 153 103  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 98.00%                  
Specialty financial | Accident Year 2009                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 186 187 186 188 184 187 193 193    
Total IBNR Plus Expected Development on Reported Claims $ 1                  
Cumulative Number of Reported Claims | claim 27,438                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 186 185 182 171 166 157 145 112    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 100.00%                  
Specialty financial | Accident Year 2010                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 130 133 135 133 133 146 139      
Total IBNR Plus Expected Development on Reported Claims $ 3                  
Cumulative Number of Reported Claims | claim 21,921                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 128 131 133 122 104 93 61      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 98.50%                  
Specialty financial | Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 146 148 155 157 158 140        
Total IBNR Plus Expected Development on Reported Claims $ 14                  
Cumulative Number of Reported Claims | claim 16,364                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 132 131 124 116 113 59        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 90.40%                  
Specialty financial | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 137 139 151 163 164          
Total IBNR Plus Expected Development on Reported Claims $ 15                  
Cumulative Number of Reported Claims | claim 21,029                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 121 117 109 104 71          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 88.30%                  
Specialty financial | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 131 137 145 141            
Total IBNR Plus Expected Development on Reported Claims $ 15                  
Cumulative Number of Reported Claims | claim 28,220                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 114 107 100 70            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 87.00%                  
Specialty financial | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 156 157 146              
Total IBNR Plus Expected Development on Reported Claims $ 22                  
Cumulative Number of Reported Claims | claim 28,814                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 125 108 62              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 80.10%                  
Specialty financial | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 159 156                
Total IBNR Plus Expected Development on Reported Claims $ 36                  
Cumulative Number of Reported Claims | claim 35,880                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 109 72                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 68.60%                  
Specialty financial | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 179                  
Total IBNR Plus Expected Development on Reported Claims $ 75                  
Cumulative Number of Reported Claims | claim 29,464                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 87                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [4] 48.60%                  
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) $ 227                  
Other specialty                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 464                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance 283                  
Unpaid losses and LAE — 11th year and prior (excluding unallocated LAE) 59                  
Unpaid losses and LAE, net of reinsurance (excluding unallocated LAE) 240 240                
Other specialty | Accident Year 2007                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance 30 33 36 36 39 40 42 42 42 45
Total IBNR Plus Expected Development on Reported Claims $ 10                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 21 21 20 19 18 17 15 12 10 $ 6
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 70.00%                  
Other specialty | Accident Year 2008                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 44 45 45 46 48 49 49 49 49  
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 $ 38 37 37 37 35 31 23 16 $ 10  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 86.40%                  
Other specialty | Accident Year 2009                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 38 36 37 37 40 41 41 41    
Total IBNR Plus Expected Development on Reported Claims $ 11                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 26 24 22 22 19 15 12 $ 8    
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 68.40%                  
Other specialty | Accident Year 2010                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 40 40 40 39 40 39 36      
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 $ 35 33 27 24 21 14 $ 8      
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 87.50%                  
Other specialty | Accident Year 2011                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 44 43 43 42 43 39        
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 $ 36 34 28 25 20 $ 12        
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 81.80%                  
Other specialty | Accident Year 2012                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 41 40 39 40 42          
Total IBNR Plus Expected Development on Reported Claims $ 10                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 28 25 21 17 $ 8          
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 68.30%                  
Other specialty | Accident Year 2013                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 47 46 47 46            
Total IBNR Plus Expected Development on Reported Claims $ 6                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 34 22 16 $ 7            
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 72.30%                  
Other specialty | Accident Year 2014                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 59 57 58              
Total IBNR Plus Expected Development on Reported Claims $ 21                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 30 21 $ 13              
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 50.80%                  
Other specialty | Accident Year 2015                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 60 59                
Total IBNR Plus Expected Development on Reported Claims $ 27                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 26 $ 10                
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 43.30%                  
Other specialty | Accident Year 2016                    
Claims Development [Line Items]                    
Incurred Claims and Allocated LAE, Net of Reinsurance $ 61                  
Total IBNR Plus Expected Development on Reported Claims $ 44                  
Cumulative Number of Reported Claims | claim [5] 0                  
Cumulative Paid Claims and Allocated LAE, Net of Reinsurance $ 9                  
Cumulative Percentage Paid of Incurred Claims and Allocated LAE, Net of Reinsurance [6] 14.80%                  
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) $ 181                  
[1] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2016).
[2] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2016).
[3] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2016).
[4] Represents the cumulative percentage paid of incurred claims and allocated LAE (net of reinsurance, as estimated at December 31, 2016).
[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, 2016).