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Short Duration Contracts - Claims development - Insurance (Details)
$ in Millions
Dec. 31, 2025
USD ($)
claims
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 23,906                  
Insurance | Property, energy, marine and aviation                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 3,855                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,894                  
All outstanding liabilities before 2016, net of reinsurance 14                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 975                  
Insurance | Property, energy, marine and aviation | 2016                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 86 $ 86 $ 87 $ 87 $ 92 $ 96 $ 100 $ 105 $ 101 $ 104
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 86 86 87 87 91 94 97 98 83 25
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claims 6,189                  
Insurance | Property, energy, marine and aviation | 2017                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 225 224 225 225 231 230 236 246 281  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 223 221 220 218 216 212 195 140 30  
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claims 6,512                  
Insurance | Property, energy, marine and aviation | 2018                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 171 170 172 170 170 174 186 181    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 162 157 154 150 143 135 102 30    
Total of IBNR liabilities plus expected development on reported claims $ 0                  
Cumulative number of reported claims | claims 5,091                  
Insurance | Property, energy, marine and aviation | 2019                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 156 156 159 161 165 179 179      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 155 153 148 139 134 105 26      
Total of IBNR liabilities plus expected development on reported claims $ (2)                  
Cumulative number of reported claims | claims 7,518                  
Insurance | Property, energy, marine and aviation | 2020                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 335 337 333 336 329 359        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 317 306 293 251 194 56        
Total of IBNR liabilities plus expected development on reported claims $ 1                  
Cumulative number of reported claims | claims 8,558                  
Insurance | Property, energy, marine and aviation | 2021                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 420 421 423 429 427          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 396 365 343 268 90          
Total of IBNR liabilities plus expected development on reported claims $ 12                  
Cumulative number of reported claims | claims 10,380                  
Insurance | Property, energy, marine and aviation | 2022                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 679 576 495 522            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 547 337 276 100            
Total of IBNR liabilities plus expected development on reported claims $ 91                  
Cumulative number of reported claims | claims 16,853                  
Insurance | Property, energy, marine and aviation | 2023                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 483 510 571              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 378 271 146              
Total of IBNR liabilities plus expected development on reported claims $ 48                  
Cumulative number of reported claims | claims 22,016                  
Insurance | Property, energy, marine and aviation | 2024                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 607 703                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 363 195                
Total of IBNR liabilities plus expected development on reported claims $ 142                  
Cumulative number of reported claims | claims 25,054                  
Insurance | Property, energy, marine and aviation | 2025                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 693                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 267                  
Total of IBNR liabilities plus expected development on reported claims $ 327                  
Cumulative number of reported claims | claims 21,693                  
Insurance | Third party occurrence business                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 6,749                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,670                  
All outstanding liabilities before 2016, net of reinsurance 375                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 4,454                  
Insurance | Third party occurrence business | 2016                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 331 345 352 363 367 375 399 406 394 389
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 252 246 230 215 195 164 137 87 42 12
Total of IBNR liabilities plus expected development on reported claims $ 49                  
Cumulative number of reported claims | claims 78,399                  
Insurance | Third party occurrence business | 2017                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 398 408 404 406 407 412 422 417 417  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 289 271 247 221 165 135 100 52 13  
Total of IBNR liabilities plus expected development on reported claims $ 72                  
Cumulative number of reported claims | claims 84,591                  
Insurance | Third party occurrence business | 2018                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 435 448 461 459 451 450 453 430    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 289 271 247 200 154 115 64 17    
Total of IBNR liabilities plus expected development on reported claims $ 84                  
Cumulative number of reported claims | claims 79,101                  
Insurance | Third party occurrence business | 2019                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 439 451 470 471 480 487 456      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 282 255 214 173 122 73 18      
Total of IBNR liabilities plus expected development on reported claims $ 80                  
Cumulative number of reported claims | claims 87,700                  
Insurance | Third party occurrence business | 2020                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 594 606 632 640 616 606        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 374 318 235 155 76 24        
Total of IBNR liabilities plus expected development on reported claims $ 91                  
Cumulative number of reported claims | claims 92,035                  
Insurance | Third party occurrence business | 2021                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 688 671 659 662 622          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 444 323 174 91 26          
Total of IBNR liabilities plus expected development on reported claims $ 66                  
Cumulative number of reported claims | claims 94,124                  
Insurance | Third party occurrence business | 2022                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 737 735 726 687            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 294 186 85 24            
Total of IBNR liabilities plus expected development on reported claims $ 300                  
Cumulative number of reported claims | claims 95,570                  
Insurance | Third party occurrence business | 2023                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 936 936 877              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 264 156 32              
Total of IBNR liabilities plus expected development on reported claims $ 482                  
Cumulative number of reported claims | claims 100,702                  
Insurance | Third party occurrence business | 2024                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 1,038 1,001                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 136 37                
Total of IBNR liabilities plus expected development on reported claims $ 756                  
Cumulative number of reported claims | claims 103,711                  
Insurance | Third party occurrence business | 2025                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 1,153                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 46                  
Total of IBNR liabilities plus expected development on reported claims $ 1,022                  
Cumulative number of reported claims | claims 79,110                  
Insurance | Third party claims-made business                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 5,334                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2,609                  
All outstanding liabilities before 2016, net of reinsurance 89                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 2,814                  
Insurance | Third party claims-made business | 2016                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 325 329 327 329 327 322 314 308 291 275
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 304 296 295 257 242 205 158 127 68 11
Total of IBNR liabilities plus expected development on reported claims $ 8                  
Cumulative number of reported claims | claims 15,135                  
Insurance | Third party claims-made business | 2017                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 326 339 337 316 323 308 311 285 270  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 284 276 257 232 196 143 113 67 9  
Total of IBNR liabilities plus expected development on reported claims $ 23                  
Cumulative number of reported claims | claims 15,712                  
Insurance | Third party claims-made business | 2018                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 362 366 366 347 335 319 314 272    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 305 285 258 208 158 118 68 12    
Total of IBNR liabilities plus expected development on reported claims $ 22                  
Cumulative number of reported claims | claims 17,304                  
Insurance | Third party claims-made business | 2019                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 326 329 329 321 317 317 288      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 254 235 196 154 122 65 12      
Total of IBNR liabilities plus expected development on reported claims $ 34                  
Cumulative number of reported claims | claims 17,428                  
Insurance | Third party claims-made business | 2020                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 419 432 445 423 412 383        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 309 265 214 151 87 17        
Total of IBNR liabilities plus expected development on reported claims $ 54                  
Cumulative number of reported claims | claims 17,580                  
Insurance | Third party claims-made business | 2021                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 446 461 498 517 514          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 269 223 162 90 23          
Total of IBNR liabilities plus expected development on reported claims $ 119                  
Cumulative number of reported claims | claims 19,120                  
Insurance | Third party claims-made business | 2022                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 570 589 654 668            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 307 218 100 25            
Total of IBNR liabilities plus expected development on reported claims $ 186                  
Cumulative number of reported claims | claims 21,348                  
Insurance | Third party claims-made business | 2023                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 901 895 809              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 332 200 64              
Total of IBNR liabilities plus expected development on reported claims $ 375                  
Cumulative number of reported claims | claims 26,037                  
Insurance | Third party claims-made business | 2024                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 777 736                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 196 56                
Total of IBNR liabilities plus expected development on reported claims $ 432                  
Cumulative number of reported claims | claims 29,857                  
Insurance | Third party claims-made business | 2025                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 882                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 49                  
Total of IBNR liabilities plus expected development on reported claims $ 736                  
Cumulative number of reported claims | claims 29,188                  
Insurance | Multi-line and other specialty                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 8,189                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 5,400                  
All outstanding liabilities before 2016, net of reinsurance 38                  
Liabilities for losses and loss adjustment expenses, net of reinsurance 2,827                  
Insurance | Multi-line and other specialty | 2016                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 403 404 406 408 408 410 416 427 430 408
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 397 396 391 390 385 379 362 341 304 $ 176
Total of IBNR liabilities plus expected development on reported claims $ 3                  
Cumulative number of reported claims | claims 196,531                  
Insurance | Multi-line and other specialty | 2017                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 516 514 515 512 504 500 491 500 482  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 499 493 479 472 446 423 380 342 $ 181  
Total of IBNR liabilities plus expected development on reported claims $ 4                  
Cumulative number of reported claims | claims 235,002                  
Insurance | Multi-line and other specialty | 2018                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 566 564 564 564 564 562 564 512    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 550 543 526 508 479 442 388 $ 211    
Total of IBNR liabilities plus expected development on reported claims $ 6                  
Cumulative number of reported claims | claims 265,421                  
Insurance | Multi-line and other specialty | 2019                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 666 670 656 650 639 611 566      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 629 611 576 548 486 385 $ 212      
Total of IBNR liabilities plus expected development on reported claims $ 8                  
Cumulative number of reported claims | claims 247,961                  
Insurance | Multi-line and other specialty | 2020                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 519 519 515 513 567 616        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 469 450 405 358 308 $ 171        
Total of IBNR liabilities plus expected development on reported claims $ 22                  
Cumulative number of reported claims | claims 170,515                  
Insurance | Multi-line and other specialty | 2021                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 643 634 613 618 634          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 557 511 427 334 $ 157          
Total of IBNR liabilities plus expected development on reported claims $ 33                  
Cumulative number of reported claims | claims 137,791                  
Insurance | Multi-line and other specialty | 2022                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 624 639 640 677            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 491 439 370 $ 177            
Total of IBNR liabilities plus expected development on reported claims $ 64                  
Cumulative number of reported claims | claims 156,572                  
Insurance | Multi-line and other specialty | 2023                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 823 809 815              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 588 489 $ 253              
Total of IBNR liabilities plus expected development on reported claims $ 133                  
Cumulative number of reported claims | claims 176,315                  
Insurance | Multi-line and other specialty | 2024                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 1,442 1,419                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 727 $ 336                
Total of IBNR liabilities plus expected development on reported claims $ 508                  
Cumulative number of reported claims | claims 200,279                  
Insurance | Multi-line and other specialty | 2025                    
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 1,987                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 493                  
Total of IBNR liabilities plus expected development on reported claims $ 1,195                  
Cumulative number of reported claims | claims 140,332