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Future Policy Benefits - Additional Information, Cohort NPR (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Accounting Standards Update 2018-12 [Abstract]    
Net Premium Ratio before capping 101.00% 100.00%
Reserves before NP Ratio capping $ 1,208 $ 1,172
Reserves after NP Ratio capping 1,211 1,173
Loss Expense $ 2 $ 0