Debt - Short and Long-Term Debt (Details)		9 Months Ended
	Apr. 26, 2021 USD ($)	May 31, 2021 USD ($)	May 31, 2020 USD ($)	May 31, 2021 GBP (£)	May 31, 2021 EUR (€)	Oct. 20, 2020 GBP (£)	Aug. 31, 2020 USD ($)	Apr. 15, 2020 USD ($)
Debt Instrument [Line Items]
Total short-term debt		$ 7,963,000,000					$ 3,265,000,000
Total long-term debt, less current portion		7,732,000,000					12,203,000,000
Long-term debt purchased and retired		11,050,000,000	$ 16,871,000,000
Loss on early extinguishment of debt		$ 419,000,000	$ 0
2.875% unsecured Pound sterling notes due 2020
Debt Instrument [Line Items]
Face amount | £				£ 700,000,000
Stated interest rate		2.875%		2.875%	2.875%	2.875%
Total short-term debt		$ 0					533,000,000
Debt redeemed | £						£ 400,000,000
3.300% unsecured notes due 2021
Debt Instrument [Line Items]
Face amount		$ 8,000,000,000
Stated interest rate		3.30%		3.30%	3.30%
Total short-term debt		$ 1,249,000,000					0
Other
Debt Instrument [Line Items]
Total short-term debt		126,000,000					144,000,000
Total $1.5 billion note issuance
Debt Instrument [Line Items]
Face amount								$ 1,500,000,000
Unsecured Notes
Debt Instrument [Line Items]
Other		31,000,000					24,000,000
Total long-term debt, less current portion		7,732,000,000					12,203,000,000
Long-term debt purchased and retired	$ 3,300,000,000
Weighted average interest rate of long-term debt purchased and retired	4.02%
Loss on early extinguishment of debt	$ 419,000,000	$ 387,000,000
Redemption premiums paid in cash	386,000,000
Unsecured Notes | 3.300% unsecured notes due 2021
Debt Instrument [Line Items]
Stated interest rate		3.30%		3.30%	3.30%
Long-term debt		$ 0					1,248,000,000
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]
Face amount								$ 500,000,000
Stated interest rate		3.20%		3.20%	3.20%			3.20%
Long-term debt		$ 497,000,000					497,000,000
Unsecured Notes | 4.100% unsecured notes due 2050
Debt Instrument [Line Items]
Face amount								$ 1,000,000,000.0
Stated interest rate		4.10%		4.10%	4.10%			4.10%
Long-term debt		$ 792,000,000					990,000,000
Debt redeemed	$ 200,000,000
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		$ 1,442,000,000					1,891,000,000
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					591,000,000
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		$ 1,154,000,000					1,993,000,000
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					496,000,000
Unsecured Notes | 4.800% unsecured notes due 2044
Debt Instrument [Line Items]
Stated interest rate		4.80%		4.80%	4.80%
Long-term debt		$ 868,000,000					1,493,000,000
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		$ 423,000,000					398,000,000
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		$ 913,000,000					891,000,000
Unsecured Notes | Total $4 billion note issuance
Debt Instrument [Line Items]
Face amount		$ 4,000,000,000
Unsecured Notes | 3.100% unsecured notes due 2022
Debt Instrument [Line Items]
Stated interest rate		3.10%		3.10%	3.10%
Long-term debt		$ 731,000,000					1,198,000,000
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					493,000,000
Commercial paper
Debt Instrument [Line Items]
Total short-term debt		2,390,000,000					1,517,000,000
Credit facilities
Debt Instrument [Line Items]
Total short-term debt		$ 4,198,000,000					$ 1,071,000,000