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Retirement benefit obligations (Tables)
 3 Months Ended
Oct. 31, 2024
Retirement Benefits [Abstract]  
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets The components of net periodic pension cost, which are included in Other income (expense), net in the condensed consolidated statements of earnings, were as follows:
Three months ended
October 31,
(In millions)20242023
Interest cost($16)($15)
Expected return on plan assets16 15 
Amortization of net actuarial losses(4)(3)
Net periodic cost($4)($3)