Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Nov. 30, 2020	Aug. 31, 2020
Operating Leases:
Operating lease right-of-use assets	$ 21,951	$ 21,724
Operating lease obligations - current	2,435	2,426
Operating lease obligations - non-current	22,166	21,973
Total operating lease obligations	24,601	24,399
Finance Leases:
Property, plant and equipment, net	759	769
Lease obligations included in:
Accrued expenses and other liabilities	32	34
Other non-current liabilities	1,009	1,020
Total finance lease obligations	$ 1,041	$ 1,054
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent