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Postretirement and Other Employee Benefits - Fair Value of Plan Assets (Details) - USD ($) $ in Millions | Aug. 31, 2023 | Aug. 31, 2022 | Aug. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 486 | $ 459 | $ 576
Asset Allocation | 100.00% | 100.00% |
Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 17 | $ 13 |
Asset Allocation | 3.00% | 3.00% |
Global equity securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 213 | $ 197 |
Asset Allocation | 44.00% | 43.00% |
Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 216 | $ 203 |
Asset Allocation | 45.00% | 44.00% |
Government bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 30 | $ 34 |
Asset Allocation | 6.00% | 7.00% |
Insurance contracts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 10 | $ 12 |
Asset Allocation | 2.00% | 3.00% |

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