Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Feb. 29, 2020	Aug. 31, 2019
Operating Leases:
Operating lease right-of-use assets	$ 21,755	$ 0
Operating lease obligation	2,278	0
Operating lease obligation	21,959	$ 0
Total operating lease obligations	24,237
Finance Leases:
Property, plant and equipment, net	802
Lease obligations included in:
Accrued expenses and other liabilities	46
Other non-current liabilities	1,032
Total finance lease obligations	$ 1,078