Leases - supplemental balance sheet information (Details) - USD ($) $ in Millions	Aug. 31, 2020	Sep. 01, 2019	Aug. 31, 2019
Operating Leases:
Operating lease right-of-use asset	$ 21,724	$ 22,000	$ 0
Operating lease obligation - current	2,426		0
Operating lease obligation - non-current	21,973		$ 0
Total operating lease obligations	24,399	$ 24,000
Finance Leases:
Property, plant and equipment, net	769
Lease obligations included in:
Accrued expenses and other liabilities	34
Other non-current liabilities	1,020
Total finance lease obligations	$ 1,054
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent