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Claim and Claim Adjustment Expense Reserves (International - Hardy - Net Incurred Claims and Allocated Claim Adjustment Expenses) (Details) - International
$ in Millions
Dec. 31, 2024
USD ($)
claim
Dec. 31, 2023
USD ($)
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 ($)
Dec. 31, 2015
USD ($)
Hardy                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 2,110                  
IBNR 455                  
Hardy | 2015                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net 176 $ 174 $ 175 $ 173 $ 173 $ 171 $ 172 $ 172 $ 174 $ 185
IBNR $ 1                  
Cumulative Number of Claims | claim 9,754                  
Hardy | 2016                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 220 219 215 214 220 219 230 240 223  
IBNR $ 6                  
Cumulative Number of Claims | claim 10,940                  
Hardy | 2017                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 248 237 248 249 241 240 249 240    
IBNR $ 1                  
Cumulative Number of Claims | claim 13,373                  
Hardy | 2018                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 319 319 301 302 297 293 264      
IBNR $ 23                  
Cumulative Number of Claims | claim 15,513                  
Hardy | 2019                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 219 217 221 214 219 216        
IBNR $ 14                  
Cumulative Number of Claims | claim 11,868                  
Hardy | 2020                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 188 189 192 198 206          
IBNR $ 40                  
Cumulative Number of Claims | claim 7,250                  
Hardy | 2021                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 142 151 164 174            
IBNR $ 43                  
Cumulative Number of Claims | claim 4,098                  
Hardy | 2022                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 189 184 187              
IBNR $ 58                  
Cumulative Number of Claims | claim 2,785                  
Hardy | 2023                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 188 197                
IBNR $ 104                  
Cumulative Number of Claims | claim 2,558                  
Hardy | 2024                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 221                  
IBNR $ 165                  
Cumulative Number of Claims | claim 1,495                  
Excluding Hardy                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 3,701                  
IBNR 1,170                  
Excluding Hardy | 2015                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net 266 267 271 272 270 267 272 288 289 $ 275
IBNR $ 10                  
Cumulative Number of Claims | claim 22,957                  
Excluding Hardy | 2016                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 289 293 277 275 262 271 273 287 $ 269  
IBNR $ 24                  
Cumulative Number of Claims | claim 15,731                  
Excluding Hardy | 2017                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 385 377 344 356 360 367 346 $ 285    
IBNR $ 44                  
Cumulative Number of Claims | claim 16,571                  
Excluding Hardy | 2018                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 397 390 380 368 369 364 $ 347      
IBNR $ 38                  
Cumulative Number of Claims | claim 21,371                  
Excluding Hardy | 2019                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 347 343 340 333 337 $ 324        
IBNR $ 57                  
Cumulative Number of Claims | claim 19,122                  
Excluding Hardy | 2020                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 328 328 343 352 $ 360          
IBNR $ 81                  
Cumulative Number of Claims | claim 15,920                  
Excluding Hardy | 2021                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 347 355 375 $ 386            
IBNR $ 121                  
Cumulative Number of Claims | claim 15,665                  
Excluding Hardy | 2022                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 409 416 $ 406              
IBNR $ 178                  
Cumulative Number of Claims | claim 13,324                  
Excluding Hardy | 2023                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 452 $ 454                
IBNR $ 266                  
Cumulative Number of Claims | claim 11,289                  
Excluding Hardy | 2024                    
Short-duration Insurance Contracts, Net Incurred Claim and Claim Adjustment Expenses [Line Items]                    
Incurred claims and allocated claim adjustment expense, net $ 481                  
IBNR $ 351                  
Cumulative Number of Claims | claim 8,017