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Acquisition - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2022
Mar. 31, 2022
Mar. 31, 2022
Business Acquisition [Line Items]      
Businesses acquisition, net of cash acquired     $ (5)
Gain on bargain purchase of a business     $ 24
Tokai Carbon Group Tianjin Co      
Business Acquisition [Line Items]      
Business acquisition, purchase price $ 9    
Business acquisition, cash consideration 14    
Businesses acquisition, net of cash acquired $ 5    
Tokai Carbon Group Tianjin Co | Accounts Payable and Accrued Liabilities [Member]      
Business Acquisition [Line Items]      
Gain on bargain purchase of a business   $ 24  
Tokai Carbon Group Tianjin Co | Tokai Carbon's Registered Capital [Member]      
Business Acquisition [Line Items]      
Business acquisition, ownership percentage 100.00%