Leases - Other Supplemental Information (Details) - USD ($) $ in Millions	9 Months Ended
	May 31, 2021	May 31, 2020
Cash paid for amounts included in the measurement of lease obligations
Operating cash flows from operating leases	$ 2,562	$ 2,487
Operating cash flows from finance leases	36	36
Financing cash flows from finance leases	31	36
Total	2,629	2,559
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	2,011	1,917
Finance leases	0	65
Total	$ 2,011	$ 1,982