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Employee Benefit Plans - Investment and Savings Plan, Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Retirement Benefits [Abstract]      
Maximum percentage of plan assets that can be in the common stock of Hartford 10.00%    
Non-elective contribution percent 2.00%    
Percent of employer matching contribution 6.00%    
Limit of employee compensation annually $ 1,000,000    
Total cost to company related to Investment and Savings Plan $ 147,000,000 $ 153,000,000 $ 156,000,000