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Postretirement and Other Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Aug. 31, 2021
Retirement Benefits [Abstract]
Service cost	$ 6	$ 6
Interest cost	1	1
Expected long-term return on plan assets	(4)	(4)
Recognized actuarial gain	(3)	(1)
Amortization of actuarial gains	(2)	(2)
Amortization of prior service credit	1	0
Net periodic benefit cost	$ (1)	$ 0
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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