Exit and disposal activities - Restructuring Reserve Activity (Details) - Transformational Cost Management Program $ in Millions	3 Months Ended
	Nov. 30, 2023 USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 102
Costs	77
Payments	(70)
Other	(21)
Ending balance	88
Lease obligations and other real estate costs
Restructuring Reserve [Roll Forward]
Beginning balance	10
Costs	36
Payments	(21)
Other	(10)
Ending balance	15
Asset Impairments
Restructuring Reserve [Roll Forward]
Beginning balance	0
Costs	10
Payments	0
Other	(10)
Ending balance	0
Employee severance and business transition costs
Restructuring Reserve [Roll Forward]
Beginning balance	70
Costs	27
Payments	(35)
Other	0
Ending balance	62
Information technology transformation and other exit costs
Restructuring Reserve [Roll Forward]
Beginning balance	22
Costs	4
Payments	(14)
Other	0
Ending balance	$ 11