Postretirement and Other Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2023	May 31, 2022
Retirement Benefits [Abstract]
Service cost	$ 4	$ 7	$ 12	$ 19
Interest cost	3	1	9	3
Expected long-term return on plan assets	(4)	(5)	(12)	(13)
Recognized actuarial gain	(2)	(2)	(6)	(8)
Amortization of actuarial gains	(2)	(2)	(5)	(6)
Amortization of prior service cost	1	1	3	3
Net periodic benefit cost (credit)	$ 0	$ 0	$ 1	$ (2)
Percentage of gain (loss) corridor	10.00%		10.00%