Leases (Schedule of Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions	Aug. 31, 2021	Aug. 31, 2020
Assets
Operating lease assets	$ 390	$ 363
Finance lease assets	318	160
Total lease assets	$ 708	$ 523
Current
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued expenses	Accrued expenses
Operating lease liabilities	$ 108	$ 111
Finance lease liabilities	$ 96	$ 7
Non-current
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Operating lease liabilities	$ 333	$ 302
Finance lease liabilities	223	161
Total lease liabilities	760	581
Operating lease assets, accumulated amortization	165	96
Finance lease assets, accumulated amortization	$ 41	$ 13