v3.26.1
Pension and Other Postretirement Benefits - Summary of Expected Health Care Cost Trend Rates (Details)
Jun. 30, 2026
Jun. 30, 2025
Retirement Benefits [Abstract]    
Assumed health care cost trend rate 6.50% 6.50%
Rate to which the cost trend rate is assumed to decline and remain (the ultimate trend rate) 5.00% 5.00%