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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, 2022
Aug. 31, 2021
Aug. 31, 2020
Change in PBO      
Beginning PBO $ 587 $ 559  
Service cost 25 25 $ 25
Interest cost 4 5 3
Actuarial (gain) loss (119) 2  
Settlements paid from plan assets (28) (44)  
Total benefits paid (13) (17)  
Plan participants’ contributions 21 25  
Plan amendments 0 24  
Acquisitions 0 8  
Effect of conversion to U.S. dollars (45) 0  
Ending PBO 432 587 559
Change in plan assets      
Beginning fair value of plan assets 576 538  
Actual return on plan assets (68) 55  
Acquisitions 0 0  
Settlements paid from plan assets (28) (44)  
Employer contributions 16 17  
Benefits paid from plan assets (12) (15)  
Plan participants’ contributions 21 25  
Effect of conversion to U.S. dollars (46) 0  
Ending fair value of plan assets 459 576 $ 538
Funded (unfunded) status 27 (11)  
Amounts recognized in the Consolidated Balance Sheets      
Accrued benefit liability, current 1 1  
Accrued benefit asset, noncurrent 28 0  
Accrued benefit liability, noncurrent 0 10  
Accumulated other comprehensive loss      
Actuarial gain, before tax (85) (69)  
Prior service cost, before tax 18 $ 23  
Net actuarial gain expected to be amortized to net period benefit cost in next fiscal year 14    
Prior service cost expected to be amortized to net periodic benefit cost in next fiscal year $ 4