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Deferred Policy Acquisition Costs, Deferred Sales Inducements and Liability for Lifetime Income Benefit Riders (Assumption Updates) (Details)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Insurance [Abstract]        
Aggregate investment spread assumption, near term, rate 2.60% 2.25% 2.40%  
Aggregate investment spread assumption, long term, rate 2.60% 2.50% 2.60% 2.60%
Mean reversion period 8 years 8 years 8 years 20 years
Net investment earned rate, rate increase (decrease), basis points 40      
Net investment earned rate assumption, near term, rate 4.25%      
Net investment earned rate assumption, long term, rate 5.00%      
Crediting / discount rate, rate increase (decrease), basis points 30      
Crediting / Discount rate assumption, near term, rate 1.65% 1.55% 1.60% 1.90%
Crediting / Discount rate assumption, long term, rate 2.40% 2.10% 2.10% 2.90%
Lapse tables, period of experience 5 years      
Lapse floor, rate 1.00%