Leases - Other Supplemental Information (Details) - USD ($) $ in Millions	6 Months Ended
	Feb. 28, 2022	Feb. 28, 2021
Cash paid for amounts included in the measurement of lease obligations:
Operating cash outflows from operating leases	$ 1,666	$ 1,702
Operating cash outflows from finance leases	23	24
Financing cash outflows from finance leases	21	20
Total	1,710	1,746
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	1,005	1,492
Finance leases	11	0
Total	$ 1,016	$ 1,492