Fair value measurements- Additional Information (Details) $ in Millions	Nov. 30, 2023 USD ($)	Aug. 31, 2023 USD ($)
Carrying Value
Liabilities [Abstract]
Fair value of long-term notes outstanding	$ 6,700
Estimate of Fair Value Measurement
Liabilities [Abstract]
Carrying value of long-term notes outstanding	5,800
Recurring
Assets [Abstract]
Money market funds	5	$ 11
Investments in equity securities	18	17
Investments in debt securities	109	15
Level 1 | Recurring
Assets [Abstract]
Money market funds	5	11
Investments in equity securities	18	17
Investments in debt securities	0	0
Level 2 | Recurring
Assets [Abstract]
Money market funds	0	0
Investments in equity securities	0	0
Investments in debt securities	$ 109	$ 15
Level 3 | Minimum | Variable Prepaid Forward, Lower Strike | Measurement Input, Price Volatility
Liabilities [Abstract]
Derivative Liability, Measurement Input	0.247	0.232
Level 3 | Minimum | Variable Prepaid Forward, Upper Strike | Measurement Input, Price Volatility
Liabilities [Abstract]
Derivative Liability, Measurement Input	0.193	0.181
Level 3 | Maximum | Variable Prepaid Forward, Lower Strike | Measurement Input, Price Volatility
Liabilities [Abstract]
Derivative Liability, Measurement Input	0.278	0.247
Level 3 | Maximum | Variable Prepaid Forward, Upper Strike | Measurement Input, Price Volatility
Liabilities [Abstract]
Derivative Liability, Measurement Input	0.208	0.191
Level 3 | Recurring
Assets [Abstract]
Money market funds	$ 0	$ 0
Investments in equity securities	0	0
Investments in debt securities	0	0
Foreign currency forwards | Recurring
Assets [Abstract]
Derivative asset	1	6
Liabilities [Abstract]
Derivative liability	24	5
Foreign currency forwards | Level 1 | Recurring
Assets [Abstract]
Derivative asset	0	0
Liabilities [Abstract]
Derivative liability	0	0
Foreign currency forwards | Level 2 | Recurring
Assets [Abstract]
Derivative asset	1	6
Liabilities [Abstract]
Derivative liability	24	5
Foreign currency forwards | Level 3 | Recurring
Assets [Abstract]
Derivative asset	0	0
Liabilities [Abstract]
Derivative liability	0	0
Cross currency interest rate swaps | Recurring
Assets [Abstract]
Derivative asset	31	28
Liabilities [Abstract]
Derivative liability	1	2
Cross currency interest rate swaps | Level 1 | Recurring
Assets [Abstract]
Derivative asset	0	0
Liabilities [Abstract]
Derivative liability	0	0
Cross currency interest rate swaps | Level 2 | Recurring
Assets [Abstract]
Derivative asset	31	28
Liabilities [Abstract]
Derivative liability	1	2
Cross currency interest rate swaps | Level 3 | Recurring
Assets [Abstract]
Derivative asset	0	0
Liabilities [Abstract]
Derivative liability	0	0
Total return swaps | Recurring
Assets [Abstract]
Derivative asset	8	1
Liabilities [Abstract]
Derivative liability		1
Total return swaps | Level 1 | Recurring
Assets [Abstract]
Derivative asset	0	0
Liabilities [Abstract]
Derivative liability		0
Total return swaps | Level 2 | Recurring
Assets [Abstract]
Derivative asset	8	1
Liabilities [Abstract]
Derivative liability		1
Total return swaps | Level 3 | Recurring
Assets [Abstract]
Derivative asset	0	0
Liabilities [Abstract]
Derivative liability		0
Variable Prepaid Forward | Recurring
Liabilities [Abstract]
Derivative liability	3,338	2,548
Variable Prepaid Forward | Level 1 | Recurring
Liabilities [Abstract]
Derivative liability	0	0
Variable Prepaid Forward | Level 2 | Recurring
Liabilities [Abstract]
Derivative liability	0	0
Variable Prepaid Forward | Level 3 | Recurring
Liabilities [Abstract]
Derivative liability	$ 3,338	$ 2,548