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Reserve for Unpaid Losses and Loss Adjustment Expenses - P&C Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 7 Months Ended 12 Months Ended 19 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]                
Beginning liabilities for unpaid losses and loss adjustment expenses, gross     $ 36,517          
Payments                
Ending liabilities for unpaid losses and loss adjustment expenses, gross   $ 36,517 37,855 $ 36,517   $ 37,855    
Adverse Development Cover Navigators Group [Member]                
Provision for unpaid losses and loss adjustment expenses                
Increase (Decrease) in Deferred Revenue     (102) (16)        
Property and Casualty Insurance Subsidiaries                
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]                
Beginning liabilities for unpaid losses and loss adjustment expenses, gross     28,261 24,584 $ 23,775      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments   5,275       5,725 $ 4,232 $ 3,957
Beginning liabilities for unpaid losses and loss adjustment expenses, net     22,986 20,352 19,818      
Provision for unpaid losses and loss adjustment expenses                
Current accident year     7,794 7,463 7,107      
Prior accident year development [1]     (136) (65) (167)      
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims     7,658 7,398 6,940      
Payments                
Current accident year     (2,214) (2,374) (2,452)      
Prior accident years     (4,190) (4,374) (3,954)      
Total payments     (6,404) (6,748) (6,406)      
Foreign currency adjustment     14 (1) 0      
Unpaid Losses and Loss Adjustment Expenses, Net of Reinsurance   22,986 22,986 20,352 19,818 23,897 20,352 $ 19,818
Ending liabilities for unpaid losses and loss adjustment expenses, gross   28,261 29,622 28,261 24,584 29,622    
Property and Casualty Insurance Subsidiaries | Continental Europe Operations [Member]                
Payments                
Net reserves transferred to liabilities held for sale   0       (45) 0  
Property and Casualty Insurance Subsidiaries | Adverse Development Cover Navigators Group [Member]                
Provision for unpaid losses and loss adjustment expenses                
Increase (Decrease) in Deferred Revenue     (312) (16) $ 0      
The Navigators Group, Inc. [Member] | Adverse Development Cover Navigators Group [Member]                
Provision for unpaid losses and loss adjustment expenses                
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims $ 97 97   $ 84        
Increase (Decrease) in Deferred Revenue   (16) $ (102)     (118)    
Payments                
Current accident year $ (29)              
The Navigators Group, Inc. [Member] | Property and Casualty Insurance Subsidiaries                
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Reserves net Reinsurance and Other Recoverables   $ 2,001       $ 0 $ 0