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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, 2023
Aug. 31, 2022
Aug. 31, 2021
Change in PBO      
Beginning PBO $ 432 $ 587  
Service cost 18 25 $ 25
Interest cost 12 4 5
Actuarial gain (23) (119)  
Settlements paid from plan assets (27) (28)  
Total benefits paid (16) (13)  
Plan participants’ contributions 22 21  
Effect of conversion to U.S. dollars 43 (45)  
Ending PBO 461 432 587
Change in plan assets      
Beginning fair value of plan assets 459 576  
Actual return on plan assets (16) (68)  
Settlements paid from plan assets (27) (28)  
Employer contributions 18 16  
Benefits paid from plan assets (15) (12)  
Plan participants’ contributions 22 21  
Effect of conversion to U.S. dollars 45 (46)  
Ending fair value of plan assets 486 459 $ 576
Funded status 25 27  
Amounts recognized in the Consolidated Balance Sheets      
Accrued benefit liability, current 1 1  
Accrued benefit asset, noncurrent 26 28  
Accumulated other comprehensive loss      
Actuarial gain, before tax (71) (85)  
Prior service cost, before tax 16 $ 18  
Net actuarial gain expected to be amortized to net period benefit cost in next fiscal year 10    
Prior service cost expected to be amortized to net periodic benefit cost in next fiscal year $ 4