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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Balance at beginning of year $ 65,477,778    
Balance at end of year 61,118,134 $ 65,477,778  
Liability for Lifetime Income Benefit Riders      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Balance at beginning of year 2,794,629 2,485,123 $ 1,670,750
Benefit expense accrual 387,821 206,180 311,211
Impact of unlocking (53,042) 243,658 285,825
Effect of net unrealized gains/losses (996,876) (101,848) 217,337
Reduction related to in-force ceded reinsurance (403,406) (38,484) 0
Claim payments 0 0 0
Balance at end of year $ 1,729,126 $ 2,794,629 $ 2,485,123