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Summary of Significant Accounting Policies (Recent accounting change) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net after tax unamortized periodic pension cost $ (8,407,439) $ (7,469,237)    
Fixed maturity securities, allowance for credit loss 671 36,751    
Retained Earnings        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net after tax unamortized periodic pension cost (12,265,070) (11,040,908) $ (10,161,005) $ (9,015,135)
Accumulated Other Comprehensive Income (Loss)        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net after tax unamortized periodic pension cost $ 517,170 $ 586,354 $ 892,905 $ (90,900)