Postretirement and Other Employee Benefits - Schedule of Fair Values of Plan Assets by Asset Category (Details) - USD ($) $ in Millions	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 548	$ 524	$ 486
Asset Allocation	100.00%	100.00%
Cash and Cash Equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 16	$ 12
Asset Allocation	3.00%	2.00%
Global Equity Securities | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 249	$ 235
Asset Allocation	46.00%	45.00%
Corporate Bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 232	$ 223
Asset Allocation	42.00%	43.00%
Government Bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 40	$ 43
Asset Allocation	7.00%	8.00%
Insurance Contracts | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair Value	$ 11	$ 11
Asset Allocation	2.00%	2.00%