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Fair Value Measurements - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Percent of debt and equity securities classified in Level 2 94.00%  
Maximum percentage of investments classified in Level 2 representing foreign bonds priced using unadjusted broker quotes 1.00%  
Percent of debt and equity securities classified in Level 3 5.00%  
Separate Account Assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Separate accounts assets classified in Level 3, period increase (decrease), , including transfers in and out of Level 3  
Separate accounts assets classified in Level 3, including disposal groups, period increase (decrease), including transfers in and out of Level 3  
Separate Account Assets | Recurring | Securities partnerships    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Expected liquidation period after inception 10 years  
Significant Other Observable Inputs (Level 2) | Swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Adjustment for credit risk on derivatives assets $ 0  
Adjustment for credit risk on derivatives assets   0
Adjustment for credit risk on derivatives liabilities $ 0  
Adjustment for credit risk on derivatives liabilities   $ 0