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Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred Policy Acquisition Cost [Line Items]        
Deferred costs $ 2,159 $ 1,939 $ 1,739  
Amortization — DAC (2,044) (1,824) (1,668)  
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net 1,113 998 874 $ 782
The Navigators Group, Inc. [Member] | Customer relationships        
Deferred Policy Acquisition Cost [Line Items]        
Add back amortization of value of business acquired [1] $ 0 $ 9 $ 21