Exit and disposal activities - Restructuring Reserve Activity (Details) - Transformational Cost Management Program $ in Millions	6 Months Ended
	Feb. 29, 2024 USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 102
Costs	272
Payments	(169)
Other	(126)
Ending balance	80
Lease obligations and other real estate costs
Restructuring Reserve [Roll Forward]
Beginning balance	10
Costs	156
Payments	(75)
Other	(77)
Ending balance	14
Asset Impairments
Restructuring Reserve [Roll Forward]
Beginning balance	0
Costs	49
Payments	0
Other	(49)
Ending balance	0
Employee severance and business transition costs
Restructuring Reserve [Roll Forward]
Beginning balance	70
Costs	60
Payments	(77)
Other	0
Ending balance	52
Information technology transformation and other exit costs
Restructuring Reserve [Roll Forward]
Beginning balance	22
Costs	7
Payments	(16)
Other	0
Ending balance	$ 14