Exit and disposal activities - Restructuring Reserve Activity (Details) - Transformational Cost Management Program $ in Millions	9 Months Ended
	May 31, 2024 USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 102
Costs	368
Payments	(268)
Other	(133)
Ending balance	69
Lease obligations and other real estate costs
Restructuring Reserve [Roll Forward]
Beginning balance	10
Costs	194
Payments	(129)
Other	(66)
Ending balance	10
Asset Impairments
Restructuring Reserve [Roll Forward]
Beginning balance	0
Costs	66
Payments	0
Other	(66)
Ending balance	0
Employee severance and business transition costs
Restructuring Reserve [Roll Forward]
Beginning balance	70
Costs	86
Payments	(98)
Other	0
Ending balance	57
Information technology transformation and other exit costs
Restructuring Reserve [Roll Forward]
Beginning balance	22
Costs	21
Payments	(41)
Other	0
Ending balance	$ 2