Leases - future lease payments for operating and finance leases (Details) - USD ($) $ in Millions	Aug. 31, 2024	Aug. 31, 2023
Finance lease
2025	$ 128
2026	123
2027	121
2028	99
2029	88
Later	892
Total undiscounted minimum lease payments	1,451
Less: Present value discount	(460)
Lease liability	991	$ 976
Operating lease 1,2
2025	3,668
2026	3,599
2027	3,519
2028	3,383
2029	3,162
Later	12,792
Total undiscounted minimum lease payments	30,123
Less: Present value discount	(6,820)
Lease liability	$ 23,303	$ 24,472