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Employee and Agent Benefits - Target Plan Asset Allocation (Details)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Pension benefits    
Asset category target allocation    
Defined Benefit Plan, Tax Status [Extensible Enumeration] Qualified benefit plans Qualified benefit plans
Pension benefits | Fixed income security portfolios | Minimum    
Asset category target allocation    
Asset category target allocation 25.00%  
Pension benefits | Fixed income security portfolios | Maximum    
Asset category target allocation    
Asset category target allocation 80.00%  
Pension benefits | Equity portfolios | Minimum    
Asset category target allocation    
Asset category target allocation 5.00%  
Pension benefits | Equity portfolios | Maximum    
Asset category target allocation    
Asset category target allocation 60.00%  
Pension benefits | Private Investments | Minimum    
Asset category target allocation    
Asset category target allocation 10.00%  
Pension benefits | Private Investments | Maximum    
Asset category target allocation    
Asset category target allocation 20.00%  
Other postretirement benefits | U.S. equity portfolios    
Asset category target allocation    
Asset category target allocation 35.00%  
Other postretirement benefits | International equity portfolios    
Asset category target allocation    
Asset category target allocation 15.00%  
Other postretirement benefits | Fixed income security portfolios    
Asset category target allocation    
Asset category target allocation 50.00%