XML 183 R123.htm IDEA: XBRL DOCUMENT v3.22.4
Reserve for Unpaid Losses and Loss Adjustment Expenses - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2017
Dec. 31, 2019
Liability for Claims and Claims Adjustment Expense [Line Items]          
Unpaid losses and loss adjustment expenses $ 41,243 $ 39,659      
Asbestos and Environmental          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Prior accident year development [1]     $ 218    
Reinsurance, Excess Retention, Amount Reinsured, Per Policy 256        
Reinsurance, Amount Retained, Per Policy       $ 1,700  
Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Asbestos and Environmental          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Reinsurance, Amount Retained, Per Policy       $ 1,700  
Retention Layer for Reserve for the Covered Liabilities as of the Inception Date [Member] | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Reinsurance, Amount Retained, Per Policy 1,816        
Retention Layer Above Reserve for the Covered Liabilities as of the Inception Date [Member] | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Reinsurance, Amount Retained, Per Policy 100        
Group Benefits          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Prior accident year development [1] (381) (458) (445)    
Unpaid losses and loss adjustment expenses 8,160 8,210 8,233   $ 8,256
Group Benefits | Group long-term disability          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Prior accident year development [1] 325 380 365    
Unpaid losses and loss adjustment expenses 6,766        
Group Benefits | Group life and accident, excluding premium waiver          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Prior accident year development [1] 50 65 65    
Unpaid losses and loss adjustment expenses 721        
Group Benefits | Group supplemental health          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Prior accident year development [1] 6 $ 10 15    
Unpaid losses and loss adjustment expenses 42        
Liability | Abuse Claims [Member]          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Prior accident year development [1]     $ 254    
Unpaid losses and loss adjustment expenses $ 787