Exit and disposal activities - Restructuring Reserve Activity (Details) - Transformational Cost Management Program $ in Millions	3 Months Ended
	Nov. 30, 2022 USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 113
Costs	130
Payments	(53)
Other	(78)
Ending balance	113
Lease obligations and other real estate costs
Restructuring Reserve [Roll Forward]
Beginning balance	10
Costs	79
Payments	(19)
Other	(59)
Ending balance	10
Asset Impairments
Restructuring Reserve [Roll Forward]
Beginning balance	0
Costs	18
Payments	0
Other	(18)
Ending balance	0
Employee severance and business transition costs
Restructuring Reserve [Roll Forward]
Beginning balance	76
Costs	16
Payments	(24)
Other	0
Ending balance	68
Information technology transformation and other exit costs
Restructuring Reserve [Roll Forward]
Beginning balance	27
Costs	17
Payments	(10)
Other	0
Ending balance	$ 35