Description of Business and Summary of Significant Accounting Policies - Reclassification from AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2021
Realized losses (gains) on derivative instruments:
Foreign exchange contracts	$ 31,835	$ 30,846	$ 26,926
Interest rate contracts	206	146	124
Actuarial gains	(7)	(6)	(10)
Prior service costs	4	4	1
Total amounts reclassified from AOCI	(1,262)	(1,231)	(944)
Reclassification out of AOCI
Realized losses (gains) on derivative instruments:
Total amounts reclassified from AOCI	32	22	(56)
Reclassification out of AOCI | Realized losses (gains) on derivative instruments
Realized losses (gains) on derivative instruments:
Loss to be reclassified in next 12 months	9
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Foreign exchange contracts
Realized losses (gains) on derivative instruments:
Foreign exchange contracts	44	30	(44)
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Interest rate contracts
Realized losses (gains) on derivative instruments:
Interest rate contracts	(2)	2	3
Reclassification out of AOCI | Actuarial gains
Realized losses (gains) on derivative instruments:
Actuarial gains	(14)	(14)	(16)
Reclassification out of AOCI | Prior service costs
Realized losses (gains) on derivative instruments:
Prior service costs	$ 4	$ 4	$ 1