Debt - Short and Long-Term Debt (Details)	6 Months Ended
	Feb. 28, 2023 USD ($)	Feb. 28, 2023 GBP (£)	Feb. 28, 2023 EUR (€)	Aug. 31, 2022 USD ($)	Nov. 17, 2021 USD ($)
Debt Instrument [Line Items]
Total short-term debt	$ 4,222,000,000			$ 1,059,000,000
Total long-term debt, less current portion	8,820,000,000			10,615,000,000
Other
Debt Instrument [Line Items]
Total short-term debt	$ 79,000,000			59,000,000
Credit facilities | Unsecured credit facility, 2 year term, due 2023
Debt Instrument [Line Items]
Debt term	2 years
Long-term debt	$ 0			1,998,000,000
Credit facilities | Unsecured credit facility, 3 year term, due 2024
Debt Instrument [Line Items]
Debt term	3 years
Long-term debt	$ 999,000,000			999,000,000
Credit facilities | Unsecured Credit Facility, 3 Year Term, Due 2026
Debt Instrument [Line Items]
Debt term	3 years
Long-term debt	$ 999,000,000			0
Unsecured Notes
Debt Instrument [Line Items]
Other	23,000,000			26,000,000
Total long-term debt, less current portion	8,820,000,000			10,615,000,000
Unsecured Notes | 0.9500% Notes Payable, Due 2023
Debt Instrument [Line Items]
Face amount					$ 850,000,000
Stated interest rate					0.95%
Long-term debt	0			848,000,000
Unsecured Notes | Total $1.5 billion note issuance
Debt Instrument [Line Items]
Face amount	$ 1,500,000,000
Unsecured Notes | 3.200% unsecured notes due 2030
Debt Instrument [Line Items]
Stated interest rate	3.20%	3.20%	3.20%
Long-term debt	$ 498,000,000			498,000,000
Unsecured Notes | 4.100% unsecured notes due 2050
Debt Instrument [Line Items]
Stated interest rate	4.10%	4.10%	4.10%
Long-term debt	$ 792,000,000			792,000,000
Unsecured Notes | Total $6 billion note issuance
Debt Instrument [Line Items]
Face amount	$ 6,000,000,000
Unsecured Notes | 3.450% unsecured notes due 2026
Debt Instrument [Line Items]
Stated interest rate	3.45%	3.45%	3.45%
Long-term debt	$ 1,443,000,000			1,443,000,000
Unsecured Notes | 4.650% unsecured notes due 2046
Debt Instrument [Line Items]
Stated interest rate	4.65%	4.65%	4.65%
Long-term debt	$ 318,000,000			318,000,000
Unsecured Notes | Total $8 billion note issuance
Debt Instrument [Line Items]
Face amount	$ 8,000,000,000
Unsecured Notes | 3.800% unsecured notes due 2024
Debt Instrument [Line Items]
Stated interest rate	3.80%	3.80%	3.80%
Long-term debt	$ 1,155,000,000			1,155,000,000
Unsecured Notes | 4.500% unsecured notes due 2034
Debt Instrument [Line Items]
Stated interest rate	4.50%	4.50%	4.50%
Long-term debt	$ 301,000,000			301,000,000
Unsecured Notes | 4.800% unsecured notes due 2044
Debt Instrument [Line Items]
Stated interest rate	4.80%	4.80%	4.80%
Long-term debt	$ 869,000,000			869,000,000
Unsecured Notes | Total £700 million note issuance
Debt Instrument [Line Items]
Face amount | £		£ 700,000,000
Unsecured Notes | 3.600% unsecured pound sterling notes due 2025
Debt Instrument [Line Items]
Stated interest rate	3.60%	3.60%	3.60%
Long-term debt	$ 361,000,000			354,000,000
Unsecured Notes | Total €750 million note issuance
Debt Instrument [Line Items]
Face amount | €			€ 750,000,000
Unsecured Notes | 2.125% unsecured euro notes due 2026
Debt Instrument [Line Items]
Stated interest rate	2.125%	2.125%	2.125%
Long-term debt	$ 799,000,000			752,000,000
Unsecured Notes | Total $4 billion note issuance
Debt Instrument [Line Items]
Face amount	$ 4,000,000,000
Unsecured Notes | 4.400% unsecured notes due 2042
Debt Instrument [Line Items]
Stated interest rate	4.40%	4.40%	4.40%
Long-term debt	$ 263,000,000			263,000,000
Commercial paper
Debt Instrument [Line Items]
Total short-term debt	$ 1,296,000,000			0
Credit facilities | Unsecured credit facility, 364 day term, due 2023
Debt Instrument [Line Items]
Debt term	364 days
Total short-term debt	$ 0			1,000,000,000
Credit facilities | Unsecured credit facility, 2 year term, due 2023
Debt Instrument [Line Items]
Debt term	2 years
Total short-term debt	$ 1,999,000,000			0
Unsecured Notes | $850 million note issuance
Debt Instrument [Line Items]
Face amount	850,000,000
Unsecured Notes | 0.9500% Notes Payable, Due 2023
Debt Instrument [Line Items]
Total short-term debt	$ 849,000,000			$ 0
Stated interest rate	0.95%	0.95%	0.95%