Leases - Future Lease Payments for Operating and Finance Leases (Details) - USD ($) $ in Millions	Nov. 30, 2020	Aug. 31, 2020
Finance lease
2021 (Remaining period)	$ 72
2022	96
2023	93
2024	93
2025	91
2026	87
Later	1,139
Total undiscounted minimum lease payments	1,671
Less: Present value discount	(630)
Lease liability	1,041	$ 1,054
Operating lease
2021 (Remaining period)	2,657
2022	3,421
2023	3,274
2024	3,126
2025	2,963
2026	2,796
Later	13,479
Total undiscounted minimum lease payments	31,716
Less: Present value discount	(7,115)
Operating lease liability	$ 24,601	$ 24,399