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Commitments and Contingencies - Schedule of Components of Purchase Commitments (Detail)
$ in Millions
Sep. 30, 2018
USD ($)
Long-term Purchase Commitment [Line Items]  
Payments Due by Fiscal Year 2019 $ 454
Payments Due by Fiscal Year 2020 297
Payments Due by Fiscal Year 2021 200
Payments Due by Fiscal Year 2022 195
Payments Due by Fiscal Year 2023 164
Payments Due Thereafter 2,168
Payments Due, Total 3,478
Reinforcement Materials [Member]  
Long-term Purchase Commitment [Line Items]  
Payments Due by Fiscal Year 2019 361
Payments Due by Fiscal Year 2020 234
Payments Due by Fiscal Year 2021 142
Payments Due by Fiscal Year 2022 138
Payments Due by Fiscal Year 2023 131
Payments Due Thereafter 1,703
Payments Due, Total 2,709
Performance Chemicals [Member]  
Long-term Purchase Commitment [Line Items]  
Payments Due by Fiscal Year 2019 70
Payments Due by Fiscal Year 2020 58
Payments Due by Fiscal Year 2021 57
Payments Due by Fiscal Year 2022 57
Payments Due by Fiscal Year 2023 33
Payments Due Thereafter 465
Payments Due, Total 740
Purification Solutions [Member]  
Long-term Purchase Commitment [Line Items]  
Payments Due by Fiscal Year 2019 8
Payments Due by Fiscal Year 2020 5
Payments Due by Fiscal Year 2021 1
Payments Due, Total 14
Specialty Fluids [Member]  
Long-term Purchase Commitment [Line Items]  
Payments Due by Fiscal Year 2019 15
Payments Due, Total $ 15