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Assets and liabilities at fair value (Tables)
 9 Months Ended
Apr. 30, 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:
April 30, 2025July 31, 2024
(In millions)Carrying AmountFair ValueCarrying AmountFair Value
Unsecured senior notes$3,079 $3,006 $2,333 $2,263 
Private placement notes700 698 849 837