Leases - Other Supplemental Information (Details) - USD ($) $ in Millions	6 Months Ended
	Feb. 28, 2023	Feb. 28, 2022
Cash paid for amounts included in the measurement of lease obligations
Operating cash flows from operating leases	$ 1,720	$ 1,666
Operating cash flows from finance leases	22	23
Financing cash flows from finance leases	21	21
Total	1,763	1,710
Right-of-use assets obtained in exchange for new lease obligations
Operating leases	1,135	1,005
Finance leases	18	11
Total	$ 1,154	$ 1,016