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Postretirement and Other Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Retirement Benefits [Abstract]
Service cost	$ 4	$ 6	$ 8	$ 12
Interest cost	3	1	6	2
Expected long-term return on plan assets	(3)	(4)	(8)	(8)
Recognized actuarial gain	(2)	(3)	(4)	(6)
Amortization of actuarial gains	(2)	(2)	(3)	(4)
Amortization of prior service cost	1	1	2	2
Net periodic benefit cost (credit)	$ 1	$ (1)	$ 1	$ (2)
Percentage of gain (loss) corridor	10.00%		10.00%

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Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Gain (Loss) Corridor Rate

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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