Leases - future lease payments for operating and finance leases (Details) - USD ($) $ in Millions	Aug. 31, 2023	Aug. 31, 2022
Finance lease
2024	$ 109
2025	104
2026	101
2027	99
2028	90
Later	967
Total undiscounted minimum lease payments	1,470
Less: Present value discount	(495)
Lease liability	976	$ 936
Operating lease 1,2
2024	3,672
2025	3,589
2026	3,508
2027	3,417
2028	3,267
Later	14,508
Total undiscounted minimum lease payments	31,960
Less: Present value discount	(7,488)
Lease liability	$ 24,472	$ 23,803