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Business and Summary of Significant Accounting Policies - Benefits and Other Changes in Policy Reserves (Details)
 12 Months Ended
Dec. 31, 2021
Deferred Annuities | Minimum  
Ceded Credit Risk [Line Items]  
Interest crediting rates for funds at subsidiaries 0.50%
Deferred Annuities | Maximum  
Ceded Credit Risk [Line Items]  
Interest crediting rates for funds at subsidiaries 6.00%
IUL's | Minimum  
Ceded Credit Risk [Line Items]  
Interest crediting rates for funds at subsidiaries 3.00%
IUL's | Maximum  
Ceded Credit Risk [Line Items]  
Interest crediting rates for funds at subsidiaries 4.80%
Funding Agreements | Minimum  
Ceded Credit Risk [Line Items]  
Interest crediting rates for funds at subsidiaries 0.90%
Funding Agreements | Maximum  
Ceded Credit Risk [Line Items]  
Interest crediting rates for funds at subsidiaries 2.00%