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Assets and liabilities at fair value (Tables)
 3 Months Ended
Oct. 31, 2025
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Recorded at Fair Value
Carrying amounts and the related estimated fair value of the Company’s long-term debt were as follows:
October 31, 2025July 31, 2025
(In millions)Carrying AmountFair ValueCarrying AmountFair Value
Unsecured senior notes$3,827 $3,829 $3,081 $3,033 
Private placement notes300 300 700 698