Income Taxes (Reconciliation of Income Tax Rate) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	21.00%	21.00%	21.00%
State income taxes, net of federal tax benefit	0.20%	(2.60%)	(1.70%)
Impact of foreign tax rates	(4.60%)	(0.90%)	(9.90%)
Permanent differences	(0.40%)	3.20%	1.80%
Income tax credits	(0.40%)	(2.50%)	(3.10%)
Changes in tax rates on deferred tax assets and liabilities	0.00%	10.30%	0.20%
One-time transition tax related to the Tax Act	0	0	(0.005)
Indefinite reinvestment assertion impact	0.00%	0.00%	0.90%
Valuation allowance	1.30%	16.80%	1.30%
Non-deductible equity compensation	0.60%	2.20%	1.40%
Impact of intercompany charges and dividends	4.40%	15.00%	10.40%
Global Intangible Low-Taxed Income	3.00%	13.70%	10.40%
Other, net	0.90%	2.00%	3.60%
Effective income tax rate	26.00%	78.20%	35.80%
Income tax benefit on income from subsidiaries	$ 51	$ 43	$ 67
Per basic share income tax benefit on income from subsidiaries (in dollars per share)	$ 0.34	$ 0.28	$ 0.43
Income tax expense associated with remeasurement of referred tax assets		$ 21
Reversal of valuation allowance			$ 18