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Notes Payable and Long-Term Debt (Schedule of Notes Payable and Long-term Debt) (Details) - USD ($)	Feb. 28, 2022	Feb. 18, 2022	Feb. 17, 2022	Aug. 31, 2021
Debt Instrument [Line Items]
Long-term debt	$ 2,881,000,000			$ 2,878,000,000
Less current installments of notes payable and long-term debt	501,000,000			0
Notes payable and long-term debt, less current installments	$ 2,380,000,000			2,878,000,000
Senior Notes \| 4.700% Senior Notes
Debt Instrument [Line Items]
Senior notes, stated interest rate (as a percent)	4.70%
Long-term debt	$ 500,000,000			499,000,000
Senior Notes \| 4.900% Senior Notes
Debt Instrument [Line Items]
Senior notes, stated interest rate (as a percent)	4.90%
Long-term debt	$ 300,000,000			300,000,000
Senior Notes \| 3.950% Senior Notes
Debt Instrument [Line Items]
Senior notes, stated interest rate (as a percent)	3.95%
Long-term debt	$ 496,000,000			496,000,000
Senior Notes \| 3.600% Senior Notes
Debt Instrument [Line Items]
Senior notes, stated interest rate (as a percent)	3.60%
Long-term debt	$ 496,000,000			495,000,000
Senior Notes \| 3.000% Senior Notes
Debt Instrument [Line Items]
Senior notes, stated interest rate (as a percent)	3.00%
Long-term debt	$ 592,000,000			591,000,000
Senior Notes \| 1.700% Senior Notes
Debt Instrument [Line Items]
Senior notes, stated interest rate (as a percent)	1.70%
Long-term debt	$ 496,000,000			496,000,000
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	0			0
Unused borrowing capacity	3,800,000,000
Line of Credit \| Term Loan Facility
Debt Instrument [Line Items]
Long-term debt	$ 1,000,000			$ 1,000,000
Line of Credit \| Commercial Paper
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 3,200,000,000	$ 1,800,000,000