Leases - Future Lease Payments for Operating and Finance Leases (Details) - USD ($) $ in Millions	Feb. 28, 2022	Aug. 31, 2021
Finance lease
2022 (Remaining period)	$ 45
2023	89
2024	89
2025	88
2026	87
2027	87
Later	1,067
Total undiscounted minimum lease payments	1,551
Less: Present value discount	(548)
Lease liability	1,003	$ 1,010
Operating lease
2022 (Remaining period)	1,734
2023	3,388
2024	3,280
2025	3,166
2026	3,056
2027	2,942
Later	13,041
Total undiscounted minimum lease payments	30,607
Less: Present value discount	(6,379)
Lease liability	$ 24,228	$ 24,412