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Fair Value Measurements - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Percent of debt and equity securities classified in Level 2 95.00%     95.00%    
Maximum percentage of investments classified in Level 2 representing foreign bonds priced using unadjusted broker quotes 1.00%     1.00%    
Percent of debt and equity securities classified in Level 3 4.00%     4.00%    
Realized investment losses on assets measured at fair value under certain conditions, after-tax       $ 0 $ 0  
Realized investment losses on equity securities with no readily determinable fair value      
Fair value of off-balance-sheet financial assets          
Fair value of off-balance-sheet financial liabilities          
Maximum            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Assets measured at fair value under certain conditions as a percent of total investments 1.00%   1.00% 1.00% 1.00%  
Separate Account Assets            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Activity, 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    
Other Derivatives | Significant Other Observable Inputs (Level 2)            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Adjustment for credit risk on derivatives assets 0     $ 0   0
Adjustment for credit risk on derivatives liabilities $ 0     $ 0   $ 0