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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Aggregate investment spread assumption, near term, rate 2.25% 2.40%    
Aggregate investment spread assumption, long term, rate 2.50% 2.60% 2.60%  
Mean reversion period 8 years 8 years 20 years  
Crediting / Discount rate assumption, near term, rate 1.55% 1.60% 1.90%  
Crediting / Discount rate assumption, long term, rate 2.10% 2.10% 2.90%  
Experience study on products with lifetime income benefit riders, period     10 years  
Assumptions for future crediting rates, US Treasury rate     3.80%  
Lifetime Income Benefit Rider, Fee Rider        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Ultimate utilization assumption, rate     60.00% 75.00%
Lifetime Income Benefit Rider, No Fee Rider        
Liability for Future Policy Benefit, by Product Segment [Line Items]        
Ultimate utilization assumption, rate     30.00% 37.50%