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Postretirement and Other Employee Benefits - Schedule of Fair Values of Plan Assets by Asset Category (Details) - USD ($) $ in Millions | Aug. 31, 2024 | Aug. 31, 2023 | Aug. 31, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 524 | $ 486 | $ 459
Asset Allocation | 100.00% | 100.00% |
Cash and Cash Equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 12 | $ 17 |
Asset Allocation | 2.00% | 3.00% |
Global Equity Securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 235 | $ 213 |
Asset Allocation | 45.00% | 44.00% |
Corporate Bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 223 | $ 216 |
Asset Allocation | 43.00% | 45.00% |
Government Bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 43 | $ 30 |
Asset Allocation | 8.00% | 6.00% |
Insurance Contracts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 11 | $ 10 |
Asset Allocation | 2.00% | 2.00% |

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