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Deferred Policy Acquisition Costs, Deferred Sales Inducements and Liability for Lifetime Income Benefit Riders (Liability for Lifetime Income Benefit Riders) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Balance at beginning of year $ 61,893,945    
Balance at end of year $ 61,768,246 $ 61,893,945  
Aggregate investment spread assumption, near term, rate 2.40%    
Aggregate investment spread assumption, long term, rate 2.60% 2.60%  
Mean reversion period 8 years 20 years  
Crediting / Discount rate assumption, near term, rate 1.60% 1.90%  
Crediting / Discount rate assumption, long term, rate 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%  
Liability for Lifetime Income Benefit Riders      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Balance at beginning of year $ 1,303,451 $ 808,167 $ 704,441
Benefit expense accrual 311,211 179,901 157,333
Impact of unlocking 285,825 315,383 (53,607)
Claim payments 0 0 0
Balance at end of year $ 1,900,487 $ 1,303,451 $ 808,167
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%