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Short Duration Contracts - Claims development - Reinsurance (Details) - USD ($)
$ in Millions
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
Dec. 31, 2015
Claims Development [Line Items]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 21,118                  
Reinsurance | Casualty                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 4,295                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,623                  
All outstanding liabilities before 2015, net of reinsurance 354                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 3,026                  
Reinsurance | Casualty | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 248 $ 257 $ 248 $ 246 $ 243 $ 236 $ 232 $ 225 $ 217 $ 218
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 177 169 151 136 119 96 71 47 20 4
Total of IBNR liabilities plus expected development on reported claims 37                  
Reinsurance | Casualty | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 279 278 269 266 266 259 244 222 209  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 186 172 156 132 113 86 51 26 6  
Total of IBNR liabilities plus expected development on reported claims 43                  
Reinsurance | Casualty | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 335 327 313 306 295 268 252 264    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 221 188 164 137 113 64 30 6    
Total of IBNR liabilities plus expected development on reported claims 49                  
Reinsurance | Casualty | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 318 304 295 283 278 286 273      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 205 182 154 129 106 31 8      
Total of IBNR liabilities plus expected development on reported claims 49                  
Reinsurance | Casualty | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 398 399 378 367 340 328        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 256 219 130 97 58 16        
Total of IBNR liabilities plus expected development on reported claims 72                  
Reinsurance | Casualty | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 385 366 348 365 377          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 177 131 90 50 18          
Total of IBNR liabilities plus expected development on reported claims 128                  
Reinsurance | Casualty | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 423 422 431 436            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 190 102 53 14            
Total of IBNR liabilities plus expected development on reported claims 157                  
Reinsurance | Casualty | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 535 523 542              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 111 60 17              
Total of IBNR liabilities plus expected development on reported claims 312                  
Reinsurance | Casualty | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 654 650                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 86 18                
Total of IBNR liabilities plus expected development on reported claims 438                  
Reinsurance | Casualty | 2024                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 720                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 14                  
Total of IBNR liabilities plus expected development on reported claims 680                  
Reinsurance | Property catastrophe                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,601                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 791                  
All outstanding liabilities before 2015, net of reinsurance 2                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 812                  
Reinsurance | Property catastrophe | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 2 2 2 2 3 3 5 11 17 32
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2 1 1 1 1 1 2 1 (3) (3)
Total of IBNR liabilities plus expected development on reported claims 0                  
Reinsurance | Property catastrophe | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 3 3 4 5 5 8 11 15 21  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2 1 1 1 1 2 1 1 (7)  
Total of IBNR liabilities plus expected development on reported claims 1                  
Reinsurance | Property catastrophe | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 20 20 20 23 35 48 53 85    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 16 16 15 13 26 36 31 31    
Total of IBNR liabilities plus expected development on reported claims (1)                  
Reinsurance | Property catastrophe | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance (2) (1) 2 11 25 43 68      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance (12) (14) (15) (18) 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 (10) (14) (7) 1 2 10        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance (27) (19) (19) 6 3 4        
Total of IBNR liabilities plus expected development on reported claims 0                  
Reinsurance | Property catastrophe | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 308 320 329 325 262          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 253 243 203 155 55          
Total of IBNR liabilities plus expected development on reported claims 9                  
Reinsurance | Property catastrophe | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 288 286 301 307            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 224 217 168 66            
Total of IBNR liabilities plus expected development on reported claims 7                  
Reinsurance | Property catastrophe | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 258 284 292              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 200 162 68              
Total of IBNR liabilities plus expected development on reported claims 25                  
Reinsurance | Property catastrophe | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 245 253                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 75 6                
Total of IBNR liabilities plus expected development on reported claims 34                  
Reinsurance | Property catastrophe | 2024                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 489                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 58                  
Total of IBNR liabilities plus expected development on reported claims 100                  
Reinsurance | Property excluding property catastrophe                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 4,241                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,470                  
All outstanding liabilities before 2015, net of reinsurance 6                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 1,777                  
Reinsurance | Property excluding property catastrophe | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 166 166 166 171 175 186 187 183 187 213
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 159 159 158 158 157 164 159 148 118 75
Total of IBNR liabilities plus expected development on reported claims 4                  
Reinsurance | Property excluding property catastrophe | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 126 128 127 133 137 133 135 143 172  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 115 113 113 112 110 102 97 93 33  
Total of IBNR liabilities plus expected development on reported claims 6                  
Reinsurance | Property excluding property catastrophe | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 197 198 201 209 225 233 244 263    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 182 182 178 175 160 153 123 27    
Total of IBNR liabilities plus expected development on reported claims 7                  
Reinsurance | Property excluding property catastrophe | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 201 201 199 209 232 236 221      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 175 175 173 165 150 106 29      
Total of IBNR liabilities plus expected development on reported claims 6                  
Reinsurance | Property excluding property catastrophe | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 193 187 187 192 202 212        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 167 166 160 148 122 42        
Total of IBNR liabilities plus expected development on reported claims 4                  
Reinsurance | Property excluding property catastrophe | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 319 317 316 336 363          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 277 264 241 206 100          
Total of IBNR liabilities plus expected development on reported claims 14                  
Reinsurance | Property excluding property catastrophe | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 491 483 489 537            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 418 358 265 135            
Total of IBNR liabilities plus expected development on reported claims 28                  
Reinsurance | Property excluding property catastrophe | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 645 654 728              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 459 354 141              
Total of IBNR liabilities plus expected development on reported claims 74                  
Reinsurance | Property excluding property catastrophe | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 720 819                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 375 149                
Total of IBNR liabilities plus expected development on reported claims 136                  
Reinsurance | Property excluding property catastrophe | 2024                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,183                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 143                  
Total of IBNR liabilities plus expected development on reported claims 687                  
Reinsurance | Marine and aviation                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 824                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 347                  
All outstanding liabilities before 2015, net of reinsurance 18                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 495                  
Reinsurance | Marine and aviation | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 24 24 25 27 28 30 31 31 37 33
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 22 22 22 22 22 22 21 19 13 0
Total of IBNR liabilities plus expected development on reported claims 1                  
Reinsurance | Marine and aviation | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 10 11 12 15 17 19 23 23 27  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 7 7 7 7 6 3 0 (2) (7)  
Total of IBNR liabilities plus expected development on reported claims 3                  
Reinsurance | Marine and aviation | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 15 15 17 20 21 24 26 29    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 12 12 12 11 11 9 6 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 20 20 21 24 24 25 27      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 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 62 62 60 60 54 48        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 49 43 34 28 21 10        
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 79 79 75 82          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 66 59 42 26 9          
Total of IBNR liabilities plus expected development on reported claims 7                  
Reinsurance | Marine and aviation | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 78 80 95 109            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 52 45 24 8            
Total of IBNR liabilities plus expected development on reported claims 9                  
Reinsurance | Marine and aviation | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 133 137 125              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 62 37 12              
Total of IBNR liabilities plus expected development on reported claims 42                  
Reinsurance | Marine and aviation | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 166 161                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 43 13                
Total of IBNR liabilities plus expected development on reported claims 66                  
Reinsurance | Marine and aviation | 2024                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 235                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 18                  
Total of IBNR liabilities plus expected development on reported claims 157                  
Reinsurance | Other specialty                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 6,695                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3,976                  
All outstanding liabilities before 2015, net of reinsurance 30                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 2,749                  
Reinsurance | Other specialty | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 245 247 249 251 261 264 264 267 269 270
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 234 234 232 231 228 217 205 191 157 $ 81
Total of IBNR liabilities plus expected development on reported claims 1                  
Reinsurance | Other specialty | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 291 298 297 300 304 298 307 314 317  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 284 284 281 275 269 253 235 199 $ 105  
Total of IBNR liabilities plus expected development on reported claims 3                  
Reinsurance | Other specialty | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 348 352 355 358 360 361 378 386    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 337 336 327 316 303 289 249 $ 132    
Total of IBNR liabilities plus expected development on reported claims 11                  
Reinsurance | Other specialty | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 405 411 411 415 391 396 403      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 369 366 344 327 306 267 $ 126      
Total of IBNR liabilities plus expected development on reported claims 22                  
Reinsurance | Other specialty | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 388 393 383 388 393 414        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 335 316 295 269 205 $ 118        
Total of IBNR liabilities plus expected development on reported claims 27                  
Reinsurance | Other specialty | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 518 526 506 511 578          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 434 396 361 286 $ 130          
Total of IBNR liabilities plus expected development on reported claims 44                  
Reinsurance | Other specialty | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 602 594 594 594            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 481 420 302 $ 148            
Total of IBNR liabilities plus expected development on reported claims 55                  
Reinsurance | Other specialty | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 956 911 929              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 606 451 $ 176              
Total of IBNR liabilities plus expected development on reported claims 161                  
Reinsurance | Other specialty | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,238 1,310                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 534 $ 238                
Total of IBNR liabilities plus expected development on reported claims 390                  
Reinsurance | Other specialty | 2024                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,704                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 362                  
Total of IBNR liabilities plus expected development on reported claims $ 1,070