v3.25.1
Pension and Other Postretirement Benefits (Funded Status Recorded on Accompanying Balance Sheets) (Details) - USD ($)
$ in Millions
Apr. 30, 2025
Apr. 30, 2024
Funded status is recorded on the accompanying consolidated balance sheets    
Accrued pension and other postretirement benefits $ (164) $ (160)
Pension Benefits [Member]    
Funded status is recorded on the accompanying consolidated balance sheets    
Other assets 31 32
Accounts payable and accrued expenses (9) (8)
Accrued pension and other postretirement benefits (129) (127)
Net liability (107) (103)
Accumulated other comprehensive income (loss), before tax:    
Net actuarial gain (loss) (171) (166)
Prior service credit (cost) (2) (4)
Total (173) (170)
Medical and Life Insurance Benefits [Member]    
Funded status is recorded on the accompanying consolidated balance sheets    
Other assets 0 0
Accounts payable and accrued expenses (4) (3)
Accrued pension and other postretirement benefits (35) (33)
Net liability (39) (36)
Accumulated other comprehensive income (loss), before tax:    
Net actuarial gain (loss) 0 2
Prior service credit (cost) 1 1
Total $ 1 $ 3