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Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended 28 Months Ended 57 Months Ended
May 23, 2019
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2016
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]              
us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_BSASettlement   $ 650          
Liability for Claims and Claims Adjustment Expense   39,378     $ 39,378 $ 39,378 $ 37,855
Reinsurance Recoverables, Gross   6,346     6,346 6,346 $ 6,119
Abuse Claims | General Liability [Member]              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Prior accident year development [1]     $ 129        
Liability for Claims and Claims Adjustment Expense   787     787 787  
PG&E              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Former Gain Contingency, Recognized in Current Period     289        
Adverse Development Cover Navigators Group [Member]              
Liability for Claims and Claims Adjustment Expense [Line Items]              
Prior accident year development [1]         382    
Payments for Reinsurance $ 91            
Policyholder Benefits and Claims Incurred, Assumed         282    
Change in Deferred Gain on Retroactive Reinsurance   191     191 191  
Reinsurance Recoverables, Gross   282     282 282  
Increase (Decrease) in Deferred Revenue   73 $ 97        
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   18          
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 $ 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