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Reserve for Unpaid Losses and Loss Adjustment Expenses - PC Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Apr. 20, 2023
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]          
Liability for Claims and Claims Adjustment Expense   $ 43,881 $ 43,881   $ 42,318
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Amortization of Deferred Gain on Retroactive Reinsurance   26 87    
Change in Deferred Gain on Retroactive Reinsurance   122 122   $ 209
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group | Retention Layer for Reserve for the Covered Liabilities as of the Inception Date          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Reinsurance, Amount Retained, Per Policy     1,816    
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group | Retention Layer Above Reserve for the Covered Liabilities as of the Inception Date          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Reinsurance, Amount Retained, Per Policy     100    
Maximum | Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Reinsurance, Excess Retention, Amount Reinsured, Per Policy     300    
General Liability [Member] | Abuse Claims          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Liability for Claims and Claims Adjustment Expense   $ 787 787    
Prior accident years $ 787        
Segment Reconciling Items | Accident and Health Insurance Product Line [Member]          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Prior accident year development [1]     (188) $ (174)  
Segment Reconciling Items | Accident and Health Insurance Product Line [Member] | COVID-19 related Claims          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Prior accident year development [1]     48 38  
Segment Reconciling Items | General Liability [Member]          
Liability for Claims and Claims Adjustment Expense [Line Items]          
Prior accident year development [1]     $ 81 $ 39