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Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended 25 Months Ended
May 23, 2019
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2016
Jun. 30, 2021
Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]              
us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_BSASettlement     $ 650        
Reinsurance Recoverables, Gross     6,316     $ 6,316 $ 6,119
Abuse Claims | General Liability [Member]              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Prior accident year development [1]   $ 102          
PG&E              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Former Gain Contingency, Recognized in Current Period   $ 289   $ 289      
Adverse Development Cover Navigators Group [Member]              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Prior accident year development [1]           354  
Payments for Reinsurance $ 91            
Policyholder Benefits and Claims Incurred, Assumed           254  
Change in Deferred Gain on Retroactive Reinsurance     163     163  
Reinsurance Recoverables, Gross     254     254  
Increase (Decrease) in Deferred Revenue     45 $ 83      
Adverse Development Cover Navigators Group [Member] | Remaining [Member]              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Maximum adverse loss development to be ceded under agreement     46        
Adverse Development Cover Navigators Group [Member] | Retention Layer for Reserve for the Covered Liabilities as of the Inception Date [Member]              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Reinsurance Retention Policy, Amount Retained     1,816        
Adverse Development Cover Navigators Group [Member] | Retention Layer Above Reserve for the Covered Liabilities as of the Inception Date [Member]              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Reinsurance Retention Policy, Amount Retained     100        
Asbestos and Environmental              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Payments for Reinsurance         $ 650    
Reinsurance Retention Policy, Amount Retained         $ 1,700    
Asbestos and Environmental | Asbestos and Environmental              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Policyholder Benefits and Claims Incurred, Assumed     860        
Change in Deferred Gain on Retroactive Reinsurance     210     $ 210  
Asbestos and Environmental | Remaining [Member] | Asbestos and Environmental              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Maximum adverse loss development to be ceded under agreement     640        
Maximum | Adverse Development Cover Navigators Group [Member]              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Maximum adverse loss development to be ceded under agreement     300        
Maximum | Asbestos and Environmental              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Maximum adverse loss development to be ceded under agreement     $ 1,500