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Claim and Claim Adjustment Expense Reserves (Commercial - Workers' Compensation - Net Cumulative Paid Claim and Claim Adjustment Expenses) (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
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]                    
Total net liability for unpaid claim and claim adjustment expenses $ 19,263 $ 18,163 $ 16,929 $ 16,300            
Commercial                    
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]                    
Total net liability for unpaid claim and claim adjustment expenses 9,939 9,021                
Workers' Compensation | Commercial                    
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]                    
Cumulative paid claims and allocated claim adjustment expense, net 2,489                  
Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented 1,743                  
Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2015 1,757                  
Other (22)                  
Liability for unallocated claim adjustment expenses for accident years presented 65                  
Total net liability for unpaid claim and claim adjustment expenses 3,543                  
Workers' Compensation | 2015 | Commercial                    
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]                    
Cumulative paid claims and allocated claim adjustment expense, net 261 259 256 251 $ 243 $ 231 $ 212 $ 180 $ 131 $ 51
Workers' Compensation | 2016 | Commercial                    
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]                    
Cumulative paid claims and allocated claim adjustment expense, net 238 235 234 227 219 198 169 129 $ 53  
Workers' Compensation | 2017 | Commercial                    
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]                    
Cumulative paid claims and allocated claim adjustment expense, net 293 287 279 265 243 207 151 $ 63    
Workers' Compensation | 2018 | Commercial                    
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]                    
Cumulative paid claims and allocated claim adjustment expense, net 307 298 280 259 229 163 $ 68      
Workers' Compensation | 2019 | Commercial                    
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]                    
Cumulative paid claims and allocated claim adjustment expense, net 310 291 262 223 169 $ 71        
Workers' Compensation | 2020 | Commercial                    
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]                    
Cumulative paid claims and allocated claim adjustment expense, net 246 228 200 147 $ 65          
Workers' Compensation | 2021 | Commercial                    
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]                    
Cumulative paid claims and allocated claim adjustment expense, net 256 222 164 $ 67            
Workers' Compensation | 2022 | Commercial                    
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]                    
Cumulative paid claims and allocated claim adjustment expense, net 258 192 $ 79              
Workers' Compensation | 2023 | Commercial                    
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]                    
Cumulative paid claims and allocated claim adjustment expense, net 209 $ 87                
Workers' Compensation | 2024 | Commercial                    
Short-Duration Insurance Contracts, Net Cumulative Paid Claim and Claim Adjustment Expenses [Line Items]                    
Cumulative paid claims and allocated claim adjustment expense, net $ 111