Postretirement and Other Employee Benefits (Benefit Obligations and Plan Assets, Changes in Benefit Obligation and Plan Assets and Funded Status of Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Change in PBO
Beginning PBO	$ 559	$ 175
Service cost	25	25	$ 1
Interest cost	5	3	3
Actuarial (gain) loss	2	(81)
Settlements paid from plan assets	(44)	(26)
Total benefits paid	(17)	(6)
Plan participants’ contributions	25	14
Plan amendments	24	0
Acquisitions	8	404
Effect of conversion to U.S. dollars	0	51
Ending PBO	587	559	175
Change in plan assets
Beginning fair value of plan assets	538	158
Actual return on plan assets	55	7
Acquisitions	0	331
Settlements paid from plan assets	(44)	(26)
Employer contributions	17	10
Benefits paid from plan assets	(15)	(6)
Plan participants’ contributions	25	14
Effect of conversion to U.S. dollars	0	50
Ending fair value of plan assets	576	538	$ 158
Unfunded status	(11)	(21)
Amounts recognized in the Consolidated Balance Sheets
Accrued benefit liability, current	1	1
Accrued benefit liability, noncurrent	10	20
Accumulated other comprehensive loss
Actuarial (gain) loss, before tax	(69)	(49)
Prior service cost, before tax	23	$ 1
Net actuarial gain expected to be amortized to net period benefit cost in next fiscal year	19
Prior service cost expected to be amortized to net periodic benefit cost in next fiscal year	$ 4