XML 225 R178.htm IDEA: XBRL DOCUMENT v3.25.4
Benefit Plans - Pension Plan Assets (Narrative) (Details)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension plans' assets      
Expected weighted average long-term rate of return on primary employee plan assets for the next fiscal year 10 years    
Expected weighted average long-term rate of return on employee-agent plan assets for the next fiscal year 5 years    
Pension benefits      
Pension plans' assets      
Notional amount of derivatives, maximum percentage of plan assets (as a percent) 130.00%    
Expected weighted average long-term rate of return on plan assets 7.58% 7.34% 7.35%
Expected weighted average long-term rate of return on plan assets for the next fiscal year 7.81%    
Arithmetic average of the annual actual return on plan assets for the last 10 years 9.00%    
Arithmetic average of the annual actual return on plan assets for the last 5 years 3.70%