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Postretirement and Other Employee Benefits - Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 459	$ 576	$ 538
Asset Allocation	100.00%	100.00%
Cash and cash equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 13	$ 15
Asset Allocation	3.00%	3.00%
Global equity securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 197	$ 222
Asset Allocation	43.00%	39.00%
Corporate bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 203	$ 262
Asset Allocation	44.00%	45.00%
Government bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 34	$ 58
Asset Allocation	7.00%	10.00%
Insurance contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 12	$ 19
Asset Allocation	3.00%	3.00%

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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