v3.26.1
Pension and Other Postretirement Benefits (Funded Status Recorded on Accompanying Balance Sheets) (Details) - USD ($)
$ in Millions
Apr. 30, 2026
Apr. 30, 2025
Funded status is recorded on the accompanying consolidated balance sheets    
Accrued pension and other postretirement benefits $ (172) $ (164)
Pension Benefits [Member]    
Funded status is recorded on the accompanying consolidated balance sheets    
Other assets 47 31
Accounts payable and accrued expenses (9) (9)
Accrued pension and other postretirement benefits (139) (129)
Net liability (101) (107)
Accumulated other comprehensive income (loss), before tax:    
Net actuarial gain (loss) (135) (171)
Prior service credit (cost) (10) (2)
Total (145) (173)
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) (4)
Accrued pension and other postretirement benefits (33) (35)
Net liability (37) (39)
Accumulated other comprehensive income (loss), before tax:    
Net actuarial gain (loss) 0 0
Prior service credit (cost) 0 1
Total $ 0 $ 1