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Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred Policy Acquisition Cost [Line Items]        
Deferred costs $ 1,947 $ 1,751 $ 1,666  
Amortization — DAC (1,835) (1,680) (1,706)  
Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits, Net 1,002 881 789 $ 785
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Continental Europe Operations [Member]        
Deferred Policy Acquisition Cost [Line Items]        
DAC transferred to assets held for sale 0 0 (3)  
The Navigators Group, Inc. [Member] | Customer relationships        
Deferred Policy Acquisition Cost [Line Items]        
Add back amortization of value of business acquired [1] $ 9 $ 21 $ 47