Accumulated Other Comprehensive Income (Reclassification from AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	$ 6,944	$ 6,259	$ 14,836	$ 13,457
Interest expense	33	31	66	63
Other expense (income)	(4)	(2)	(3)	(3)
Total amounts reclassified from AOCI	(222)	(152)	(463)	(352)
Loss to be reclassified in next 12 months			10
Reclassification out of AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total amounts reclassified from AOCI	(9)	(21)	(11)	(37)
Reclassification out of AOCI | Realized losses (gain) on derivative instruments | Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	(6)	(22)	(5)	(39)
Reclassification out of AOCI | Realized losses (gain) on derivative instruments | Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense	1	1	2	2
Reclassification out of AOCI | Actuarial gain
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other expense (income)	(5)	0	(10)	0
Reclassification out of AOCI | Prior service cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other expense (income)	$ 1	$ 0	$ 2	$ 0