Exit and disposal activities - Restructuring Reserve Activity (Details) - Transformational Cost Management Program $ in Millions	9 Months Ended
	May 31, 2023 USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 113
Costs	682
Payments	(218)
Other	(455)
Ending balance	121
Lease obligations and other real estate costs
Restructuring Reserve [Roll Forward]
Beginning balance	10
Costs	151
Payments	(69)
Other	(81)
Ending balance	11
Asset Impairments
Restructuring Reserve [Roll Forward]
Beginning balance	0
Costs	385
Payments	0
Other	(385)
Ending balance	0
Employee severance and business transition costs
Restructuring Reserve [Roll Forward]
Beginning balance	76
Costs	102
Payments	(103)
Other	13
Ending balance	88
Information technology transformation and other exit costs
Restructuring Reserve [Roll Forward]
Beginning balance	27
Costs	45
Payments	(46)
Other	(2)
Ending balance	$ 23