Commitments and Contingencies - Schedule of Components of Purchase Commitments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014
Long-term Purchase Commitment [Line Items]
Payments Due by Fiscal Year 2015	$ 368
Payments Due by Fiscal Year 2016	302
Payments Due by Fiscal Year 2017	274
Payments Due by Fiscal Year 2018	267
Payments Due by Fiscal Year 2019	259
Payments Due Thereafter	2,490
Payments Due, Total	3,960
Reinforcement Materials [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Fiscal Year 2015	302
Payments Due by Fiscal Year 2016	254
Payments Due by Fiscal Year 2017	233
Payments Due by Fiscal Year 2018	226
Payments Due by Fiscal Year 2019	220
Payments Due Thereafter	2,308
Payments Due, Total	3,543
Performance Materials [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Fiscal Year 2015	43
Payments Due by Fiscal Year 2016	35
Payments Due by Fiscal Year 2017	30
Payments Due by Fiscal Year 2018	30
Payments Due by Fiscal Year 2019	29
Payments Due Thereafter	168
Payments Due, Total	335
Purification Solutions [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Fiscal Year 2015	21
Payments Due by Fiscal Year 2016	12
Payments Due by Fiscal Year 2017	10
Payments Due by Fiscal Year 2018	10
Payments Due by Fiscal Year 2019	9
Payments Due Thereafter	14
Payments Due, Total	76
Advanced Technologies [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Fiscal Year 2015	2
Payments Due by Fiscal Year 2016	1
Payments Due by Fiscal Year 2017	1
Payments Due by Fiscal Year 2018	1
Payments Due by Fiscal Year 2019	1
Payments Due Thereafter
Payments Due, Total	$ 6