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Debt - narrative (Details) - USD ($)							12 Months Ended
Debt - narrative (Details) - USD ($)	Aug. 09, 2023	Mar. 02, 2023	Dec. 19, 2022	Jun. 17, 2022	Nov. 17, 2021	Nov. 15, 2021	Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2021
Line of Credit Facility [Line Items]
Interest paid, net of capitalized interest							$ 606,000,000	$ 420,000,000	$ 916,000,000
Loss on early extinguishment of debt							0	6,000,000	414,000,000
Commercial paper
Line of Credit Facility [Line Items]
Commercial paper, amount outstanding							$ 0	0
Maximum
Line of Credit Facility [Line Items]
Debt to total capitalization ratio							0.60
Unsecured notes
Line of Credit Facility [Line Items]
Loss on early extinguishment of debt								6,000,000	$ 387,000,000
Unsecured notes \| 0.9500% notes payable, due 2023
Line of Credit Facility [Line Items]
Face amount					$ 850,000,000		$ 850,000,000
Stated interest rate (as a percent)					95.00%		0.95%
Debt instrument, redemption price, percentage					100.00%
Long term debt							$ 0	$ 848,000,000
Credit facilities \| Unsecured credit facility, due August 2026
Line of Credit Facility [Line Items]
Face amount	$ 2,250,000,000
Debt term	3 years
Borrowings outstanding							0
Credit facilities \| Unsecured credit facility, due August 2026 \| Minimum \| SOFR
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.75%
Credit facilities \| Unsecured credit facility, due August 2026 \| Maximum \| SOFR
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.50%
Credit facilities \| Unsecured credit facility, due August 2023
Line of Credit Facility [Line Items]
Face amount	$ 1,000,000,000
Debt term	3 years
Borrowings outstanding							0
Credit facilities \| Unsecured credit facility, due August 2023 \| SOFR
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	1.125%
Credit facilities \| Unsecured credit facility, 364 day term, due 2024
Line of Credit Facility [Line Items]
Face amount		$ 900,000,000
Debt term		364 days
Credit facilities \| Unsecured credit facility, 364 day term, due 2024 \| Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		0.80%
Credit facilities \| Unsecured credit facility, 364 day term, due 2024 \| Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate		1.10%
Credit facilities \| Unsecured credit facility, 3 year term, due 2026
Line of Credit Facility [Line Items]
Face amount			$ 1,000,000,000
Borrowings outstanding							1,000,000,000
Credit facilities \| Unsecured credit facility, 3 year term, due 2026 \| SOFR
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate			1.125%
Credit facilities \| June 17, 2022 revolving credit facility, five-year facility
Line of Credit Facility [Line Items]
Face amount				$ 3,500,000,000
Debt term				5 years
Credit facilities \| June 17, 2022 revolving credit facility, 18-month facility
Line of Credit Facility [Line Items]
Face amount				$ 1,500,000,000
Debt term				18 months
Borrowings outstanding							0
Credit facilities \| June 17, 2022 revolving credit facility, 18-month facility \| Minimum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate				0.80%
Credit facilities \| June 17, 2022 revolving credit facility, 18-month facility \| Maximum
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate				1.50%
Credit facilities \| Delayed draw term loan credit facility
Line of Credit Facility [Line Items]
Face amount						$ 5,000,000,000
Credit facilities \| Delayed draw term loan credit facility \| Term loan
Line of Credit Facility [Line Items]
Long term debt							$ 289,000,000
Credit facilities \| Delayed draw term loan credit facility, 364-day facility \| Term loan
Line of Credit Facility [Line Items]
Face amount						$ 2,000,000,000
Debt term						364 days
Credit facilities \| Delayed draw term loan credit facility, 364-day facility \| Term loan \| Eurodollar
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate						0.75%
Credit facilities \| Delayed draw term loan credit facility, two-year facility \| Term loan
Line of Credit Facility [Line Items]
Debt term						2 years
Credit facilities \| Term loan
Line of Credit Facility [Line Items]
Face amount						$ 3,000,000,000
Credit facilities \| Term loan \| June 17, 2022 revolving credit facility, five-year facility
Line of Credit Facility [Line Items]
Debt term				5 years
Credit facilities \| Term loan \| June 17, 2022 revolving credit facility, 18-month facility
Line of Credit Facility [Line Items]
Debt term				18 months
Credit facilities \| Term loan \| Delayed draw term loan credit facility, two-year facility
Line of Credit Facility [Line Items]
Face amount						$ 2,000,000,000
Debt term						2 years
Credit facilities \| Term loan \| Delayed draw term loan credit facility, two-year facility \| Eurodollar
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate						0.88%
Credit facilities \| Term loan \| Delayed draw term loan credit facility, three-year facility
Line of Credit Facility [Line Items]
Face amount						$ 1,000,000,000
Debt term						3 years
Credit facilities \| Term loan \| Delayed draw term loan credit facility, three-year facility \| SOFR
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate						1.03%