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Postretirement and Other Employee Benefits (Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 576 | $ 538 | $ 158
Asset Allocation | 100.00% | 100.00% |
Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 15 | $ 15 |
Asset Allocation | 3.00% | 3.00% |
Global equity securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 222 | $ 208 |
Asset Allocation | 39.00% | 38.00% |
Corporate bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 262 | $ 238 |
Asset Allocation | 45.00% | 44.00% |
Government bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 58 | $ 58 |
Asset Allocation | 10.00% | 11.00% |
Insurance contracts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 19 | $ 19 |
Asset Allocation | 3.00% | 4.00% |

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