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Reserve for Unpaid Losses and Loss Adjustment Expenses - Historical Loss Development Triangles, P&C (Details)
claim in Millions, $ in Millions
Dec. 31, 2021
USD ($)
claim
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Workers’ compensation | Segment Reconciling Items                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 18,263                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 9,992                  
Workers’ compensation | 2012                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 2,133 $ 2,135 $ 2,146 $ 2,154 $ 2,169 $ 2,168 $ 2,181 $ 2,207 $ 2,207 $ 2,185
IBNR Reserves $ 310                  
Claims Reported | claim 171,562                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,706 1,678 1,644 1,587 1,529 1,436 1,313 1,106 809 359
Workers’ compensation | 2013                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,811 1,831 1,850 1,861 1,861 1,883 1,920 1,981 2,020  
IBNR Reserves $ 346                  
Claims Reported | claim 151,492                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,361 1,339 1,304 1,260 1,175 1,071 917 675 304  
Workers’ compensation | 2014                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,654 1,679 1,692 1,713 1,761 1,789 1,838 1,869    
IBNR Reserves $ 386                  
Claims Reported | claim 126,288                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,167 1,137 1,099 1,041 960 811 598 275    
Workers’ compensation | 2015                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,667 1,699 1,714 1,724 1,801 1,835 1,873      
IBNR Reserves $ 412                  
Claims Reported | claim 114,113                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,117 1,068 1,004 909 778 576 261      
Workers’ compensation | 2016                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,708 1,748 1,767 1,780 1,772 1,772        
IBNR Reserves $ 489                  
Claims Reported | claim 112,302                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,064 1,003 908 779 579 255        
Workers’ compensation | 2017                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,757 1,822 1,840 1,869 1,862          
IBNR Reserves $ 636                  
Claims Reported | claim 111,800                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 977 900 778 575 261          
Workers’ compensation | 2018                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,904 1,915 1,917 1,916            
IBNR Reserves $ 726                  
Claims Reported | claim 118,951                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 983 837 624 283            
Workers’ compensation | 2019                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,934 1,935 1,937              
IBNR Reserves $ 844                  
Claims Reported | claim 119,416                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 856 637 291              
Workers’ compensation | 2020                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,864 1,865                
IBNR Reserves $ 1,114                  
Claims Reported | claim 90,199                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 507 223                
Workers’ compensation | 2021                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,831                  
IBNR Reserves $ 1,314                  
Claims Reported | claim 93,860                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 254                  
General liability | Segment Reconciling Items                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 6,731                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 3,157                  
General liability | 2012                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 406 407 413 421 408 410 392 399 402 423
IBNR Reserves $ 41                  
Claims Reported | claim 16,768                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 352 332 323 305 280 233 170 101 55 13
General liability | 2013                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 500 508 505 502 488 484 456 442 455  
IBNR Reserves $ 42                  
Claims Reported | claim 14,134                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 442 422 398 372 320 233 141 53 13  
General liability | 2014                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 505 515 522 513 494 481 475 506    
IBNR Reserves $ 52                  
Claims Reported | claim 15,242                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 423 402 358 304 214 130 42 15    
General liability | 2015                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 637 647 633 594 554 560 556      
IBNR Reserves $ 71                  
Claims Reported | claim 15,627                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 524 477 409 278 156 55 10      
General liability | 2016                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 620 632 632 607 583 613        
IBNR Reserves $ 92                  
Claims Reported | claim 16,817                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 447 368 283 131 52 12        
General liability | 2017                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 613 615 613 614 626          
IBNR Reserves $ 174                  
Claims Reported | claim 16,447                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 344 255 156 67 15          
General liability | 2018                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 703 697 669 692            
IBNR Reserves $ 295                  
Claims Reported | claim 17,749                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 288 177 84 21            
General liability | 2019                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 822 827 822              
IBNR Reserves $ 512                  
Claims Reported | claim 16,858                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 193 100 29              
General liability | 2020                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 923 938                
IBNR Reserves $ 739                  
Claims Reported | claim 11,991                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 110 45                
General liability | 2021                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,002                  
IBNR Reserves $ 929                  
Claims Reported | claim 8,364                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 34                  
Marine [Member] | Segment Reconciling Items                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,516                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,242                  
Marine [Member] | 2012                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 165 164 164 168 164 163 169 180 220 196
IBNR Reserves $ 1                  
Claims Reported | claim 6,789                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 159 158 159 155 152 148 139 125 101 51
Marine [Member] | 2013                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 139 140 138 135 140 136 134 152 149  
IBNR Reserves $ (2)                  
Claims Reported | claim 6,629                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 134 133 126 121 119 112 100 82 42  
Marine [Member] | 2014                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 171 167 169 164 165 158 160 163    
IBNR Reserves $ 1                  
Claims Reported | claim 7,137                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 162 159 157 151 131 116 81 41    
Marine [Member] | 2015                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 140 138 134 148 146 146 158      
IBNR Reserves $ (3)                  
Claims Reported | claim 10,137                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 141 140 134 126 116 85 40      
Marine [Member] | 2016                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 147 150 148 138 143 140        
IBNR Reserves $ (17)                  
Claims Reported | claim 13,178                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 141 132 123 106 80 35        
Marine [Member] | 2017                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 180 174 175 187 160          
IBNR Reserves $ (8)                  
Claims Reported | claim 15,586                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 163 154 142 111 48          
Marine [Member] | 2018                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 161 154 161 144            
IBNR Reserves $ (8)                  
Claims Reported | claim 14,037                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 148 138 104 37            
Marine [Member] | 2019                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 140 142 144              
IBNR Reserves $ 15                  
Claims Reported | claim 8,413                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 101 83 36              
Marine [Member] | 2020                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 142 150                
IBNR Reserves $ 26                  
Claims Reported | claim 4,730                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 69 32                
Marine [Member] | 2021                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 131                  
IBNR Reserves $ 72                  
Claims Reported | claim 3,499                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 24                  
Package business | Segment Reconciling Items                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 6,952                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 5,208                  
Package business | 2012                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 727 732 732 739 735 736 731 728 725 736
IBNR Reserves $ 24                  
Claims Reported | claim 59,921                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 699 697 694 687 673 652 616 560 486 286
Package business | 2013                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 583 587 586 592 586 585 573 565 579  
IBNR Reserves $ 22                  
Claims Reported | claim 43,675                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 552 549 541 522 504 467 414 339 225  
Package business | 2014                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 581 593 603 603 602 601 578 566    
IBNR Reserves $ 29                  
Claims Reported | claim 43,321                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 542 535 525 507 468 416 345 226    
Package business | 2015                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 567 581 588 583 585 588 582      
IBNR Reserves $ 34                  
Claims Reported | claim 42,232                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 513 505 486 445 383 332 212      
Package business | 2016                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 595 611 625 632 638 655        
IBNR Reserves $ 51                  
Claims Reported | claim 44,079                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 521 500 465 410 353 225        
Package business | 2017                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 644 657 692 702 695          
IBNR Reserves $ 73                  
Claims Reported | claim 46,638                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 534 496 447 372 235          
Package business | 2018                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 667 688 724 719            
IBNR Reserves $ 114                  
Claims Reported | claim 44,822                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 498 451 402 237            
Package business | 2019                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 749 769 813              
IBNR Reserves $ 175                  
Claims Reported | claim 43,073                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 488 413 254              
Package business | 2020                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 893 915                
IBNR Reserves $ 316                  
Claims Reported | claim 61,161                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 493 326                
Package business | 2021                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 946                  
IBNR Reserves $ 412                  
Claims Reported | claim 40,792                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 368                  
Property | P&C Commercial Lines | Segment Reconciling Items                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 3,830                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 3,342                  
Property | P&C Commercial Lines | 2012                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 332 332 333 334 335 337 335 334 333 369
IBNR Reserves $ 0                  
Claims Reported | claim 26,861                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 330 330 330 331 331 331 326 317 296 182
Property | P&C Commercial Lines | 2013                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 247 247 247 248 249 252 254 252 268  
IBNR Reserves $ 0                  
Claims Reported | claim 21,620                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 245 245 245 244 242 243 238 223 161  
Property | P&C Commercial Lines | 2014                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 279 280 280 279 280 282 281 293    
IBNR Reserves $ (1)                  
Claims Reported | claim 21,030                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 280 280 279 279 279 270 250 170    
Property | P&C Commercial Lines | 2015                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 301 304 305 301 302 301 299      
IBNR Reserves $ 0                  
Claims Reported | claim 21,029                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 302 303 302 296 285 257 179      
Property | P&C Commercial Lines | 2016                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 408 408 406 399 420 406        
IBNR Reserves $ 3                  
Claims Reported | claim 23,781                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 406 402 396 379 342 215        
Property | P&C Commercial Lines | 2017                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 441 439 456 516 577          
IBNR Reserves $ 5                  
Claims Reported | claim 24,382                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 433 427 412 378 229          
Property | P&C Commercial Lines | 2018                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 403 424 437 450            
IBNR Reserves $ 8                  
Claims Reported | claim 21,715                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 386 379 344 188            
Property | P&C Commercial Lines | 2019                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 419 440 480              
IBNR Reserves $ 4                  
Claims Reported | claim 21,002                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 383 351 215              
Property | P&C Commercial Lines | 2020                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 469 501                
IBNR Reserves $ 96                  
Claims Reported | claim 20,327                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 336 221                
Property | P&C Commercial Lines | 2021                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 531                  
IBNR Reserves $ 108                  
Claims Reported | claim 16,394                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 241                  
Automobile liability | P&C Commercial Lines | Segment Reconciling Items                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 3,908                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 2,778                  
Automobile liability | P&C Commercial Lines | 2012                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 387 388 388 387 389 395 402 391 377 311
IBNR Reserves $ 6                  
Claims Reported | claim 36,053                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 379 378 376 372 359 346 307 234 143 65
Automobile liability | P&C Commercial Lines | 2013                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 333 334 336 339 340 341 334 318 311  
IBNR Reserves $ 7                  
Claims Reported | claim 32,242                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 324 323 320 311 295 259 202 130 62  
Automobile liability | P&C Commercial Lines | 2014                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 332 333 334 341 337 331 317 309    
IBNR Reserves $ 6                  
Claims Reported | claim 29,613                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 320 318 309 299 252 197 131 59    
Automobile liability | P&C Commercial Lines | 2015                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 360 359 356 356 372 358 308      
IBNR Reserves $ 10                  
Claims Reported | claim 28,565                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 344 335 314 267 207 142 62      
Automobile liability | P&C Commercial Lines | 2016                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 395 391 391 390 393 385        
IBNR Reserves $ 15                  
Claims Reported | claim 29,167                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 357 339 303 232 147 65        
Automobile liability | P&C Commercial Lines | 2017                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 381 383 379 383 372          
IBNR Reserves $ 11                  
Claims Reported | claim 26,341                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 328 285 211 134 60          
Automobile liability | P&C Commercial Lines | 2018                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 406 405 396 349            
IBNR Reserves $ 36                  
Claims Reported | claim 24,610                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 305 238 153 62            
Automobile liability | P&C Commercial Lines | 2019                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 450 439 425              
IBNR Reserves $ 114                  
Claims Reported | claim 28,216                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 247 160 67              
Automobile liability | P&C Commercial Lines | 2020                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 424 428                
IBNR Reserves $ 227                  
Claims Reported | claim 21,557                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 119 55                
Automobile liability | P&C Commercial Lines | 2021                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 440                  
IBNR Reserves $ 340                  
Claims Reported | claim 17,404                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 55                  
Automobile liability | P&C Personal Lines | Segment Reconciling Items                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 11,104                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 9,809                  
Automobile liability | P&C Personal Lines | 2012                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,128 1,129 1,130 1,130 1,130 1,133 1,142 1,146 1,149 1,141
IBNR Reserves $ 4                  
Claims Reported | claim 210,757                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,123 1,123 1,122 1,120 1,114 1,104 1,067 986 818 441
Automobile liability | P&C Personal Lines | 2013                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,155 1,156 1,157 1,153 1,152 1,153 1,144 1,145 1,131  
IBNR Reserves $ 6                  
Claims Reported | claim 205,485                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,148 1,144 1,142 1,135 1,121 1,091 1,002 816 442  
Automobile liability | P&C Personal Lines | 2014                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,199 1,201 1,202 1,199 1,200 1,198 1,153 1,146    
IBNR Reserves $ 6                  
Claims Reported | claim 209,022                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,190 1,186 1,182 1,165 1,125 1,032 843 430    
Automobile liability | P&C Personal Lines | 2015                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,324 1,328 1,331 1,330 1,338 1,340 1,195      
IBNR Reserves $ 8                  
Claims Reported | claim 216,889                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,310 1,304 1,292 1,243 1,142 935 475      
Automobile liability | P&C Personal Lines | 2016                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,386 1,395 1,397 1,393 1,402 1,407        
IBNR Reserves $ 11                  
Claims Reported | claim 215,839                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,363 1,345 1,308 1,188 968 505        
Automobile liability | P&C Personal Lines | 2017                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,200 1,214 1,228 1,275 1,277          
IBNR Reserves $ 18                  
Claims Reported | claim 187,513                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 1,161 1,123 1,033 836 441          
Automobile liability | P&C Personal Lines | 2018                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,058 1,072 1,104 1,108            
IBNR Reserves $ 51                  
Claims Reported | claim 156,152                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 965 888 710 359            
Automobile liability | P&C Personal Lines | 2019                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 991 1,010 1,018              
IBNR Reserves $ 97                  
Claims Reported | claim 139,360                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 816 654 323              
Automobile liability | P&C Personal Lines | 2020                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 782 805                
IBNR Reserves $ 192                  
Claims Reported | claim 95,755                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 486 238                
Automobile liability | P&C Personal Lines | 2021                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 881                  
IBNR Reserves $ 444                  
Claims Reported | claim 94,494                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 247                  
Commercial automobile physical damage | P&C Commercial Lines | Segment Reconciling Items                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 172                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 162                  
Commercial automobile physical damage | P&C Commercial Lines | 2019                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 63 64 63              
IBNR Reserves $ 1                  
Claims Reported | claim 19,853                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 62 62 56              
Commercial automobile physical damage | P&C Commercial Lines | 2020                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 51 51                
IBNR Reserves $ 1                  
Claims Reported | claim 14,671                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 50 45                
Commercial automobile physical damage | P&C Commercial Lines | 2021                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 58                  
IBNR Reserves $ 2                  
Claims Reported | claim 14,253                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 50                  
Professional liability | Segment Reconciling Items                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 2,511                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,335                  
Professional liability | 2012                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 212 217 225 219 221 221 218 238 238 242
IBNR Reserves $ (3)                  
Claims Reported | claim 7,037                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 176 175 175 172 169 155 139 100 67 17
Professional liability | 2013                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 169 171 171 173 174 174 187 195 207  
IBNR Reserves $ 14                  
Claims Reported | claim 5,979                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 148 142 137 131 116 88 67 44 10  
Professional liability | 2014                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 174 183 182 179 178 181 183 187    
IBNR Reserves $ 21                  
Claims Reported | claim 6,734                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 145 146 135 131 108 74 38 8    
Professional liability | 2015                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 200 207 214 190 180 174 164      
IBNR Reserves $ 15                  
Claims Reported | claim 7,245                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 164 141 125 107 85 40 9      
Professional liability | 2016                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 197 196 197 204 176 183        
IBNR Reserves $ 27                  
Claims Reported | claim 8,391                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 149 125 112 88 51 8        
Professional liability | 2017                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 241 226 232 203 205          
IBNR Reserves $ 47                  
Claims Reported | claim 9,466                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 151 123 88 48 11          
Professional liability | 2018                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 278 278 281 248            
IBNR Reserves $ 74                  
Claims Reported | claim 10,040                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 166 130 73 15            
Professional liability | 2019                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 336 317 298              
IBNR Reserves $ 150                  
Claims Reported | claim 9,654                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 150 78 21              
Professional liability | 2020                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 365 370                
IBNR Reserves $ 259                  
Claims Reported | claim 7,713                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 71 19                
Professional liability | 2021                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 339                  
IBNR Reserves $ 310                  
Claims Reported | claim 5,450                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 15                  
Bond | Segment Reconciling Items                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 625                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 254                  
Bond | 2012                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 46 48 48 45 49 49 55 61 70 71
IBNR Reserves $ 11                  
Claims Reported | claim 1,729                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 34 35 35 34 26 26 24 26 25 12
Bond | 2013                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 34 34 35 39 49 48 55 58 64  
IBNR Reserves $ 13                  
Claims Reported | claim 1,468                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 20 20 20 19 19 19 17 9 3  
Bond | 2014                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 60 60 59 59 67 66 67 71    
IBNR Reserves $ 8                  
Claims Reported | claim 1,387                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 47 46 44 43 43 40 31 18    
Bond | 2015                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 47 48 54 60 63 67 67      
IBNR Reserves $ 17                  
Claims Reported | claim 1,395                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 30 32 34 31 24 20 9      
Bond | 2016                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 45 51 55 61 61 61        
IBNR Reserves $ 23                  
Claims Reported | claim 1,339                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 22 22 20 15 12 2        
Bond | 2017                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 79 94 101 90 63          
IBNR Reserves $ 36                  
Claims Reported | claim 1,724                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 42 54 55 46 5          
Bond | 2018                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 71 72 68 68            
IBNR Reserves $ 36                  
Claims Reported | claim 1,664                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 24 23 16 6            
Bond | 2019                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 74 73 72              
IBNR Reserves $ 58                  
Claims Reported | claim 1,779                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 15 13 3              
Bond | 2020                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 84 83                
IBNR Reserves $ 71                  
Claims Reported | claim 1,889                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 12 4                
Bond | 2021                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 85                  
IBNR Reserves $ 68                  
Claims Reported | claim 1,960                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 8                  
Assumed Reinsurance [Member] | Segment Reconciling Items                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,384                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,106                  
Assumed Reinsurance [Member] | 2012                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 120 120 120 119 120 115 88 93 99 107
IBNR Reserves $ 0                  
Claims Reported | claim 1,468                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 119 119 119 118 118 112 85 83 77 38
Assumed Reinsurance [Member] | 2013                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 103 103 103 102 102 105 103 119 115  
IBNR Reserves $ (1)                  
Claims Reported | claim 1,656                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 103 103 103 101 100 98 91 83 53  
Assumed Reinsurance [Member] | 2014                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 115 116 116 115 118 122 142 119    
IBNR Reserves $ (1)                  
Claims Reported | claim 1,820                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 115 114 113 112 109 106 119 66    
Assumed Reinsurance [Member] | 2015                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 96 96 95 94 94 92 102      
IBNR Reserves $ 0                  
Claims Reported | claim 1,582                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 95 94 91 83 77 65 42      
Assumed Reinsurance [Member] | 2016                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 102 102 100 98 91 89        
IBNR Reserves $ (5)                  
Claims Reported | claim 1,730                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 97 95 90 84 66 36        
Assumed Reinsurance [Member] | 2017                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 153 157 162 153 129          
IBNR Reserves $ (3)                  
Claims Reported | claim 2,166                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 147 145 135 116 44          
Assumed Reinsurance [Member] | 2018                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 135 130 128 129            
IBNR Reserves $ (13)                  
Claims Reported | claim 2,263                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 140 134 112 25            
Assumed Reinsurance [Member] | 2019                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 187 190 181              
IBNR Reserves $ 20                  
Claims Reported | claim 2,522                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 154 132 62              
Assumed Reinsurance [Member] | 2020                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 181 183                
IBNR Reserves $ 71                  
Claims Reported | claim 1,623                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 90 50                
Assumed Reinsurance [Member] | 2021                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 192                  
IBNR Reserves $ 104                  
Claims Reported | claim 584                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 46                  
Personal automobile physical damage | Segment Reconciling Items                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,200                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 1,170                  
Personal automobile physical damage | 2019                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 441 442 445              
IBNR Reserves $ 0                  
Claims Reported | claim 277,060                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 441 441 427              
Personal automobile physical damage | 2020                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 346 349                
IBNR Reserves $ 5                  
Claims Reported | claim 210,783                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 341 333                
Personal automobile physical damage | 2021                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 413                  
IBNR Reserves $ (6)                  
Claims Reported | claim 213,209                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 388                  
Homeowners | Segment Reconciling Items                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 6,307                  
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 5,982                  
Homeowners | 2012                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 737 737 738 738 738 739 741 741 741 774
IBNR Reserves $ 0                  
Claims Reported | claim 142,860                  
Homeowners | 2013                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 629 630 629 630 632 634 637 638 673  
IBNR Reserves $ 1                  
Claims Reported | claim 113,552                  
Homeowners | 2014                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 698 698 698 698 700 702 707 710    
IBNR Reserves $ 0                  
Claims Reported | claim 121,923                  
Homeowners | 2015                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 684 684 684 684 690 703 690      
IBNR Reserves $ 1                  
Claims Reported | claim 119,997                  
Homeowners | 2016                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 658 658 658 663 673 669        
IBNR Reserves $ 2                  
Claims Reported | claim 119,793                  
Homeowners | 2017                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 775 783 884 889 866          
IBNR Reserves $ 6                  
Claims Reported | claim 124,713                  
Homeowners | 2018                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 642 673 910 903            
IBNR Reserves $ (6)                  
Claims Reported | claim 102,784                  
Homeowners | 2019                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 470 475 501              
IBNR Reserves $ 13                  
Claims Reported | claim 84,536                  
Homeowners | 2020                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 512 525                
IBNR Reserves $ 26                  
Claims Reported | claim 87,841                  
Homeowners | 2021                    
Claims Development [Line Items]                    
Incurred Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 502                  
IBNR Reserves $ 107                  
Claims Reported | claim 71,196                  
Homeowners | P&C Personal Lines | Segment Reconciling Items                    
Claims Development [Line Items]                    
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 5,982                  
Homeowners | P&C Personal Lines | 2012                    
Claims Development [Line Items]                    
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 736 736 736 735 734 731 727 719 696 $ 547
Homeowners | P&C Personal Lines | 2013                    
Claims Development [Line Items]                    
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 628 628 628 627 626 622 611 590 $ 467  
Homeowners | P&C Personal Lines | 2014                    
Claims Development [Line Items]                    
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 698 697 697 695 691 684 663 $ 526    
Homeowners | P&C Personal Lines | 2015                    
Claims Development [Line Items]                    
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 681 681 680 674 665 645 $ 487      
Homeowners | P&C Personal Lines | 2016                    
Claims Development [Line Items]                    
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 655 653 649 640 621 $ 481        
Homeowners | P&C Personal Lines | 2017                    
Claims Development [Line Items]                    
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 761 757 795 747 $ 538          
Homeowners | P&C Personal Lines | 2018                    
Claims Development [Line Items]                    
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 619 616 712 $ 484            
Homeowners | P&C Personal Lines | 2019                    
Claims Development [Line Items]                    
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 445 425 $ 318              
Homeowners | P&C Personal Lines | 2020                    
Claims Development [Line Items]                    
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance 454 $ 335                
Homeowners | P&C Personal Lines | 2021                    
Claims Development [Line Items]                    
Cumulative Paid Losses & Allocated Loss Adjustment Expenses, Net of Reinsurance $ 305