Postretirement and Other Employee Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2022	May 31, 2021
Retirement Benefits [Abstract]
Service cost	$ 7	$ 6	$ 19	$ 19
Interest cost	1	2	3	4
Expected long-term return on plan assets	(5)	(4)	(13)	(12)
Recognized actuarial gain	(2)	(1)	(8)	(4)
Amortization of actuarial gains	(2)	(2)	(6)	(5)
Amortization of prior service credit	1	0	3	0
Net periodic benefit cost (credit)	$ 0	$ 1	$ (2)	$ 2