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Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 19 Months Ended 48 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2020
Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Benefits, losses and loss adjustment expenses       $ 11,805 $ 11,472 $ 11,165      
Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease)     $ 238            
Reinsurance Recoverables, Including Reinsurance Premium Paid $ 6,011 $ 5,527   6,011 5,527     $ 6,011 $ 6,011
Increase (Decrease) in Reinsurance Recoverable       540 81 323      
Asbestos and Environmental                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Prior accident year development [1]       218          
Adverse development from comprehensive annual review               220 860
Change in Deferred Gain on Retroactive Reinsurance       210          
Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease)       218          
Reinsurance Retention Policy, Excess Retention, Amount Reinsured       640          
Reinsurance Retention Policy, Amount Retained             $ 1,700    
Net asbestos reserves                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Prior accident year development [1]       127          
Net environmental reserves                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Prior accident year development [1]       91          
Adverse Development Cover Navigators Group [Member]                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Adverse development from comprehensive annual review       209          
Change in Deferred Gain on Retroactive Reinsurance       102 16        
Reinsurance premium   $ 91              
Deferred Revenue 118     118       118 118
Adverse Development Cover Navigators Group [Member] | Remaining [Member]                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Reinsurance Retention Policy, Excess Retention, Amount Reinsured 91                
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]                  
Adverse development from comprehensive annual review       309          
Reinsurance Retention Policy, Amount Retained       100          
Asbestos and Environmental                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Adverse development from comprehensive annual review               220  
Benefits, losses and loss adjustment expenses       2          
Reinsurance Recoverables, Including Reinsurance Premium Paid     238     238      
Asbestos and Environmental | Asbestos and Environmental                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Adverse development from comprehensive annual review       860          
Reinsurance premium             650    
Reinsurance Retention Policy, Amount Retained             $ 1,700    
Deferred Revenue $ 210     210       $ 210 $ 210
Asbestos and Environmental | Remaining [Member] | Asbestos and Environmental                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Reinsurance Retention Policy, Excess Retention, Amount Reinsured       640          
Liability | Abuse Claims [Member]                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Prior accident year development [1]       254          
Liability | Adverse Development Cover Navigators Group [Member]                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Adverse development from comprehensive annual review       53          
Property and Casualty Insurance Subsidiaries                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Prior accident year development [1]       (136) (65) (167)      
Adverse development from comprehensive annual review       1,156 826 661      
Property and Casualty Insurance Subsidiaries | Scenario, Adjustment [Member]                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Increase (Decrease) in Reinsurance Recoverable       90          
Property and Casualty Insurance Subsidiaries | Scenario, Adjustment [Member] | Catastrophes                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Prior accident year development [1]           133      
Liability for Catastrophe Claims, Carrying Amount     $ 850     850      
Property and Casualty Insurance Subsidiaries | Adverse Development Cover Navigators Group [Member]                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Change in Deferred Gain on Retroactive Reinsurance       312 $ 16 $ 0      
Automobile | Adverse Development Cover Navigators Group [Member] | P&C Commercial Lines                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Adverse development from comprehensive annual review       12          
Maximum | Asbestos and Environmental                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Reinsurance Retention Policy, Excess Retention, Amount Reinsured       1,500          
Maximum | Adverse Development Cover Navigators Group [Member]                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Reinsurance Retention Policy, Excess Retention, Amount Reinsured       300          
Maximum | Asbestos and Environmental | Asbestos and Environmental                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Reinsurance Retention Policy, Excess Retention, Amount Reinsured       $ 1,500          
Maximum | Property and Casualty Insurance Subsidiaries                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Weighted average discount rate 14.03% 14.03% 14.15% 14.03% 14.03% 14.15%   14.03% 14.03%
Minimum [Member] | Property and Casualty Insurance Subsidiaries                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Weighted average discount rate 0.83% 1.76% 1.77% 0.83% 1.76% 1.77%   0.83% 0.83%
PG&E [Member]                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Former Gain Contingency, Recognized in Current Period $ 289     $ 289       $ 289 $ 289