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Short Duration Contracts - Claims development - Reinsurance (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Claims Development [Line Items]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 23,906                  
Reinsurance | Casualty                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 5,210                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,831                  
All outstanding liabilities before 2016, net of reinsurance 406                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 3,785                  
Reinsurance | Casualty | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 289 $ 287 $ 285 $ 277 $ 273 $ 274 $ 267 $ 252 $ 228 $ 216
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 197 188 174 158 133 114 87 52 26 6
Total of IBNR liabilities plus expected development on reported claims 45                  
Reinsurance | Casualty | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 346 343 336 321 314 302 274 258 271  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 239 224 190 165 138 113 64 30 6  
Total of IBNR liabilities plus expected development on reported claims 55                  
Reinsurance | Casualty | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 332 328 314 304 291 286 295 281    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 224 207 183 155 129 107 31 8    
Total of IBNR liabilities plus expected development on reported claims 53                  
Reinsurance | Casualty | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 402 405 406 384 372 346 336      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 287 258 220 131 97 58 16      
Total of IBNR liabilities plus expected development on reported claims 65                  
Reinsurance | Casualty | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 365 399 379 360 377 389        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 202 178 132 90 51 18        
Total of IBNR liabilities plus expected development on reported claims 108                  
Reinsurance | Casualty | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 464 428 428 438 444          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 236 191 103 54 15          
Total of IBNR liabilities plus expected development on reported claims 163                  
Reinsurance | Casualty | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 539 546 533 552            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 182 114 62 18            
Total of IBNR liabilities plus expected development on reported claims 241                  
Reinsurance | Casualty | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 695 669 664              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 173 88 19              
Total of IBNR liabilities plus expected development on reported claims 385                  
Reinsurance | Casualty | 2024                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 776 734                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 66 14                
Total of IBNR liabilities plus expected development on reported claims 624                  
Reinsurance | Casualty | 2025                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,002                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 25                  
Total of IBNR liabilities plus expected development on reported claims 928                  
Reinsurance | Property catastrophe                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,980                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,062                  
All outstanding liabilities before 2016, net of reinsurance 2                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 920                  
Reinsurance | Property catastrophe | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 4 4 4 5 6 6 9 12 16 23
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3 2 2 2 2 2 3 2 2 (7)
Total of IBNR liabilities plus expected development on reported claims 0                  
Reinsurance | Property catastrophe | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 20 21 21 21 24 36 50 54 86  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 17 17 17 16 14 27 37 32 31  
Total of IBNR liabilities plus expected development on reported claims 0                  
Reinsurance | Property catastrophe | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance (4) (2) 0 3 12 25 44 69    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance (12) (11) (13) (14) (17) 12 2 27    
Total of IBNR liabilities plus expected development on reported claims 0                  
Reinsurance | Property catastrophe | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance (8) (7) (11) (4) 4 4 12      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance (26) (25) (16) (17) 8 4 4      
Total of IBNR liabilities plus expected development on reported claims 1                  
Reinsurance | Property catastrophe | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 321 319 330 341 337 272        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 271 262 251 208 158 57        
Total of IBNR liabilities plus expected development on reported claims 5                  
Reinsurance | Property catastrophe | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 302 307 305 318 323          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 243 239 230 177 66          
Total of IBNR liabilities plus expected development on reported claims 11                  
Reinsurance | Property catastrophe | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 262 273 298 306            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 219 211 169 70            
Total of IBNR liabilities plus expected development on reported claims 30                  
Reinsurance | Property catastrophe | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 227 272 272              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 120 84 8              
Total of IBNR liabilities plus expected development on reported claims 18                  
Reinsurance | Property catastrophe | 2024                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 441 512                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 145 60                
Total of IBNR liabilities plus expected development on reported claims 67                  
Reinsurance | Property catastrophe | 2025                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 415                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 82                  
Total of IBNR liabilities plus expected development on reported claims 84                  
Reinsurance | Property excluding property catastrophe                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 5,150                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3,055                  
All outstanding liabilities before 2016, net of reinsurance 8                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 2,103                  
Reinsurance | Property excluding property catastrophe | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 124 127 130 129 135 138 135 136 144 174
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 116 117 114 114 113 111 103 98 94 33
Total of IBNR liabilities plus expected development on reported claims 3                  
Reinsurance | Property excluding property catastrophe | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 197 201 202 205 213 230 237 250 267  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 186 186 186 182 178 164 155 124 28  
Total of IBNR liabilities plus expected development on reported claims 6                  
Reinsurance | Property excluding property catastrophe | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 197 203 203 202 212 235 239 223    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 181 177 177 175 167 151 107 30    
Total of IBNR liabilities plus expected development on reported claims 3                  
Reinsurance | Property excluding property catastrophe | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 193 196 190 190 195 206 216      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 174 170 169 162 150 124 43      
Total of IBNR liabilities plus expected development on reported claims 11                  
Reinsurance | Property excluding property catastrophe | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 313 322 320 319 339 368        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 291 280 266 243 207 101        
Total of IBNR liabilities plus expected development on reported claims (1)                  
Reinsurance | Property excluding property catastrophe | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 500 499 491 497 546          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 457 424 363 269 136          
Total of IBNR liabilities plus expected development on reported claims 14                  
Reinsurance | Property excluding property catastrophe | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 656 660 670 745            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 526 468 360 142            
Total of IBNR liabilities plus expected development on reported claims 70                  
Reinsurance | Property excluding property catastrophe | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 744 740 839              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 489 382 151              
Total of IBNR liabilities plus expected development on reported claims 117                  
Reinsurance | Property excluding property catastrophe | 2024                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,056 1,212                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 445 144                
Total of IBNR liabilities plus expected development on reported claims 325                  
Reinsurance | Property excluding property catastrophe | 2025                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,170                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 190                  
Total of IBNR liabilities plus expected development on reported claims 648                  
Reinsurance | Marine and aviation                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,041                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 447                  
All outstanding liabilities before 2016, net of reinsurance 18                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 612                  
Reinsurance | Marine and aviation | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 10 11 11 12 15 17 19 23 23 27
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 8 7 7 7 7 6 3 0 (2) (7)
Total of IBNR liabilities plus expected development on reported claims 2                  
Reinsurance | Marine and aviation | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 15 15 15 17 20 21 24 26 29  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 12 12 12 12 12 11 9 7 2  
Total of IBNR liabilities plus expected development on reported claims 2                  
Reinsurance | Marine and aviation | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 19 20 21 21 24 24 25 27    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 16 16 15 14 13 11 7 2    
Total of IBNR liabilities plus expected development on reported claims 2                  
Reinsurance | Marine and aviation | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 60 63 62 61 60 55 48      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 49 49 43 35 29 22 11      
Total of IBNR liabilities plus expected development on reported claims 6                  
Reinsurance | Marine and aviation | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 81 82 80 80 76 83        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 71 66 60 42 26 9        
Total of IBNR liabilities plus expected development on reported claims 4                  
Reinsurance | Marine and aviation | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 86 79 82 96 110          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 68 53 45 24 8          
Total of IBNR liabilities plus expected development on reported claims 8                  
Reinsurance | Marine and aviation | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 167 134 138 126            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 86 63 37 12            
Total of IBNR liabilities plus expected development on reported claims 38                  
Reinsurance | Marine and aviation | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 156 170 161              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 77 43 13              
Total of IBNR liabilities plus expected development on reported claims 44                  
Reinsurance | Marine and aviation | 2024                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 220 233                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 44 18                
Total of IBNR liabilities plus expected development on reported claims 100                  
Reinsurance | Marine and aviation | 2025                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 227                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 16                  
Total of IBNR liabilities plus expected development on reported claims 172                  
Reinsurance | Specialty                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 8,564                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 4,930                  
All outstanding liabilities before 2016, net of reinsurance 35                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 3,669                  
Reinsurance | Specialty | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 315 312 319 318 321 326 319 328 335 338
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 305 304 305 301 295 288 271 251 213 $ 113
Total of IBNR liabilities plus expected development on reported claims 6                  
Reinsurance | Specialty | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 378 372 376 379 384 386 385 405 412  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 362 361 360 350 339 325 309 266 $ 141  
Total of IBNR liabilities plus expected development on reported claims 11                  
Reinsurance | Specialty | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 425 431 438 438 442 417 423 431    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 392 393 389 366 348 326 286 $ 135    
Total of IBNR liabilities plus expected development on reported claims 16                  
Reinsurance | Specialty | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 398 413 418 408 412 418 441      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 354 355 335 313 286 217 $ 126      
Total of IBNR liabilities plus expected development on reported claims 25                  
Reinsurance | Specialty | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 532 543 551 531 536 607        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 471 453 413 377 299 $ 138        
Total of IBNR liabilities plus expected development on reported claims 36                  
Reinsurance | Specialty | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 638 637 630 629 628          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 546 508 443 319 $ 156          
Total of IBNR liabilities plus expected development on reported claims 33                  
Reinsurance | Specialty | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 950 991 942 962            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 698 627 465 $ 186            
Total of IBNR liabilities plus expected development on reported claims 108                  
Reinsurance | Specialty | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,321 1,230 1,303              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 714 502 $ 207              
Total of IBNR liabilities plus expected development on reported claims 330                  
Reinsurance | Specialty | 2024                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,647 1,696                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 705 $ 331                
Total of IBNR liabilities plus expected development on reported claims 623                  
Reinsurance | Specialty | 2025                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,960                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 383                  
Total of IBNR liabilities plus expected development on reported claims $ 1,275