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Statutory Accounting Practices (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statutory Accounting Practices [Abstract]      
Increase in statutory capital and surplus $ 91 $ 91  
Combined Continental Casualty Companies [Member]      
Statutory Accounting Practices [Abstract]      
Allowable dividends payable without prior supervisory approval 1,070    
Dividends paid 975    
Statutory capital and surplus 10,708 10,787  
Statutory net income $ 800 $ 1,062 $ 1,405
Statutory capital and surplus percentage of risk-based capital 266.00% 291.00%