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Additional Insurance Liabilities - Summary of Weighted-Average Anterest rates for the Liability for Additional Insurance Liabilities (Detail)
Jun. 30, 2024
Dec. 31, 2023
Schedule of Weighted Average Interest Rates for the Liability for Additional Insurance Liabilities [Abstract]    
Interest accretion rate [1] 3.40% 3.20%
Projected crediting rate [2] 3.90% 3.80%
[1] The interest accretion rate is determined by using the weighted-average policyholder crediting rates for the underlying policies over the period in-force, and based on the adjusted beginning balance, is used to measure the amount of interest accretion.
[2] The projected crediting rate is determined by using a future crediting rate curve that utilizes a portfolio approach reflecting anticipated reinvestment activity and runoff of existing assets over the projection period. The projected crediting rate is used to discount future assessments and excess benefits.