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Policyholder Account Balances - Additional Information (Detail)
12 Months Ended
Dec. 31, 2018
Minimum  
Interest crediting rates range for sensitive contracts 0.40%
Interest crediting rates for individual annuities 0.00%
Interest crediting rates for funding agreements 0.50%
Maximum  
Interest crediting rates range for sensitive contracts 6.00%
Interest crediting rates for individual annuities 6.00%
Interest crediting rates for funding agreements 1.00%