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Short Duration Contracts - Claims development - Reinsurance (Details) - USD ($)
$ in Millions
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
Dec. 31, 2014
Claims Development [Line Items]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 15,700                  
Reinsurance | Casualty                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 3,801                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,405                  
All outstanding liabilities before 2014, net of reinsurance 310                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 2,706                  
Reinsurance | Casualty | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 241 $ 234 $ 234 $ 237 $ 237 $ 227 $ 230 $ 217 $ 220 $ 215
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 160 153 145 134 114 91 63 41 16 4
Total of IBNR liabilities plus expected development on reported claims 33                  
Reinsurance | Casualty | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 260 251 249 246 239 235 228 219 220  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 170 152 137 120 96 71 47 20 4  
Total of IBNR liabilities plus expected development on reported claims 44                  
Reinsurance | Casualty | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 281 272 268 269 262 247 224 212    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 172 157 132 113 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 330 316 309 297 270 254 267      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 189 164 137 113 64 30 6      
Total of IBNR liabilities plus expected development on reported claims 53                  
Reinsurance | Casualty | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 308 298 286 281 289 276        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 182 155 129 106 31 8        
Total of IBNR liabilities plus expected development on reported claims 50                  
Reinsurance | Casualty | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 400 379 367 341 330          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 219 130 97 58 16          
Total of IBNR liabilities plus expected development on reported claims 84                  
Reinsurance | Casualty | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 372 354 371 382            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 132 90 50 18            
Total of IBNR liabilities plus expected development on reported claims 163                  
Reinsurance | Casualty | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 425 434 439              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 102 53 15              
Total of IBNR liabilities plus expected development on reported claims 205                  
Reinsurance | Casualty | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 527 547                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 61 18                
Total of IBNR liabilities plus expected development on reported claims 390                  
Reinsurance | Casualty | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 657                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 18                  
Total of IBNR liabilities plus expected development on reported claims 568                  
Reinsurance | Property catastrophe                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,229                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 668                  
All outstanding liabilities before 2014, net of reinsurance 2                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 563                  
Reinsurance | Property catastrophe | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 19 19 19 19 20 20 22 25 30 44
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 19 19 19 19 19 18 19 18 20 14
Total of IBNR liabilities plus expected development on reported claims 0                  
Reinsurance | Property catastrophe | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 3 3 3 3 4 6 12 18 33  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2 2 2 2 2 2 2 (2) (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 5 5 6 7 9 13 17 24    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3 3 3 2 3 2 2 (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 22 21 24 36 50 54 86      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 17 16 14 27 37 32 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 5 8 17 30 49 71        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance (9) (11) (13) 16 5 27        
Total of IBNR liabilities plus expected development on reported claims 3                  
Reinsurance | Property catastrophe | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance (7) 1 9 10 20          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance (13) (14) 11 7 4          
Total of IBNR liabilities plus expected development on reported claims 2                  
Reinsurance | Property catastrophe | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 326 337 333 269            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 249 207 158 56            
Total of IBNR liabilities plus expected development on reported claims 17                  
Reinsurance | Property catastrophe | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 294 308 314              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 222 171 65              
Total of IBNR liabilities plus expected development on reported claims 13                  
Reinsurance | Property catastrophe | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 295 303                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 169 70                
Total of IBNR liabilities plus expected development on reported claims 41                  
Reinsurance | Property catastrophe | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 267                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 9                  
Total of IBNR liabilities plus expected development on reported claims 76                  
Reinsurance | Property excluding property catastrophe                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 3,285                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,029                  
All outstanding liabilities before 2014, net of reinsurance 5                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 1,261                  
Reinsurance | Property excluding property catastrophe | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 79 79 80 82 84 88 90 98 117 142
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 78 78 78 78 78 78 76 71 62 23
Total of IBNR liabilities plus expected development on reported claims 0                  
Reinsurance | Property excluding property catastrophe | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 167 167 173 176 187 188 184 188 214  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 160 159 159 159 165 160 149 119 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 130 130 136 139 135 137 145 175    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 115 115 114 111 104 98 94 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 202 206 214 230 237 250 268      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 186 182 179 164 156 125 28      
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 203 202 212 235 239 224        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 177 175 167 152 108 30        
Total of IBNR liabilities plus expected development on reported claims 7                  
Reinsurance | Property excluding property catastrophe | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 190 190 195 206 216          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 169 162 150 124 43          
Total of IBNR liabilities plus expected development on reported claims 3                  
Reinsurance | Property excluding property catastrophe | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 320 320 340 368            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 267 243 207 101            
Total of IBNR liabilities plus expected development on reported claims 15                  
Reinsurance | Property excluding property catastrophe | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 491 497 545              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 364 270 136              
Total of IBNR liabilities plus expected development on reported claims 38                  
Reinsurance | Property excluding property catastrophe | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 668 742                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 361 143                
Total of IBNR liabilities plus expected development on reported claims 119                  
Reinsurance | Property excluding property catastrophe | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 835                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 152                  
Total of IBNR liabilities plus expected development on reported claims 414                  
Reinsurance | Marine and aviation                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 611                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 271                  
All outstanding liabilities before 2014, net of reinsurance 17                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 357                  
Reinsurance | Marine and aviation | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 18 19 22 22 23 23 25 27 29 31
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 17 17 16 16 15 15 12 11 8 4
Total of IBNR liabilities plus expected development on reported claims 0                  
Reinsurance | Marine and aviation | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 24 25 27 28 30 31 32 37 33  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 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 11 12 15 17 19 23 23 27    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 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 17 20 21 24 26 29      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 12 12 12 11 9 6 2      
Total of IBNR liabilities plus expected development on reported claims 3                  
Reinsurance | Marine and aviation | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 21 21 24 24 26 27        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 15 14 13 11 7 2        
Total of IBNR liabilities plus expected development on reported claims 3                  
Reinsurance | Marine and aviation | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 62 61 60 55 48          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 43 35 29 21 11          
Total of IBNR liabilities plus expected development on reported claims 9                  
Reinsurance | Marine and aviation | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 80 79 76 83            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 60 42 26 9            
Total of IBNR liabilities plus expected development on reported claims 10                  
Reinsurance | Marine and aviation | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 81 96 110              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 45 24 8              
Total of IBNR liabilities plus expected development on reported claims 18                  
Reinsurance | Marine and aviation | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 138 126                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 37 12                
Total of IBNR liabilities plus expected development on reported claims 59                  
Reinsurance | Marine and aviation | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 161                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 13                  
Total of IBNR liabilities plus expected development on reported claims 127                  
Reinsurance | Other specialty                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 5,483                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3,408                  
All outstanding liabilities before 2014, net of reinsurance 19                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 2,094                  
Reinsurance | Other specialty | 2014                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 295 296 298 304 308 307 312 318 316 337
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 282 280 278 275 271 258 248 229 186 $ 96
Total of IBNR liabilities plus expected development on reported claims 1                  
Reinsurance | Other specialty | 2015                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 255 258 259 270 273 273 276 278 280  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 241 240 239 236 224 211 197 162 $ 83  
Total of IBNR liabilities plus expected development on reported claims 3                  
Reinsurance | Other specialty | 2016                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 307 306 309 314 307 316 323 326    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 293 289 283 277 261 242 205 $ 108    
Total of IBNR liabilities plus expected development on reported claims 6                  
Reinsurance | Other specialty | 2017                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 363 366 370 372 372 390 398      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 346 337 326 313 298 256 $ 136      
Total of IBNR liabilities plus expected development on reported claims 15                  
Reinsurance | Other specialty | 2018                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 423 424 428 404 409 416        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 376 353 336 315 276 $ 130        
Total of IBNR liabilities plus expected development on reported claims 29                  
Reinsurance | Other specialty | 2019                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 405 395 400 406 427          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 325 303 277 211 $ 121          
Total of IBNR liabilities plus expected development on reported claims 40                  
Reinsurance | Other specialty | 2020                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 539 519 524 593            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 405 370 293 $ 134            
Total of IBNR liabilities plus expected development on reported claims 61                  
Reinsurance | Other specialty | 2021                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 613 611 610              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 432 311 $ 152              
Total of IBNR liabilities plus expected development on reported claims 80                  
Reinsurance | Other specialty | 2022                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 935 953                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 464 $ 182                
Total of IBNR liabilities plus expected development on reported claims 225                  
Reinsurance | Other specialty | 2023                    
Claims Development [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,348                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 244                  
Total of IBNR liabilities plus expected development on reported claims $ 817