Commitments and Contingencies - Schedule of Components of Purchase Commitments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Long-term Purchase Commitment [Line Items]
Payments Due by Fiscal Year 2014	$ 398
Payments Due by Fiscal Year 2015	347
Payments Due by Fiscal Year 2016	270
Payments Due by Fiscal Year 2017	219
Payments Due by Fiscal Year 2018	213
Payments Due Thereafter	3,037
Payments Due, Total	4,484
Reinforcement Materials [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Fiscal Year 2014	326
Payments Due by Fiscal Year 2015	293
Payments Due by Fiscal Year 2016	226
Payments Due by Fiscal Year 2017	183
Payments Due by Fiscal Year 2018	178
Payments Due Thereafter	2,793
Payments Due, Total	3,999
Performance Materials [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Fiscal Year 2014	42
Payments Due by Fiscal Year 2015	37
Payments Due by Fiscal Year 2016	33
Payments Due by Fiscal Year 2017	25
Payments Due by Fiscal Year 2018	25
Payments Due Thereafter	226
Payments Due, Total	388
Purification Solutions [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Fiscal Year 2014	28
Payments Due by Fiscal Year 2015	15
Payments Due by Fiscal Year 2016	10
Payments Due by Fiscal Year 2017	10
Payments Due by Fiscal Year 2018	9
Payments Due Thereafter	17
Payments Due, Total	89
Advanced Technologies [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Fiscal Year 2014	2
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 Thereafter	1
Payments Due, Total	$ 8