Debt and Other Obligations - Schedule of Long-Term Obligations (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Revolving Credit Facility Expiry August 2016 [Member]	Sep. 30, 2013 Revolving Credit Facility Expiry August 2016 [Member]	Sep. 30, 2014 Chinese Renminbi Notes, Due Through 2016, 6.15%-6.77% [Member]	Sep. 30, 2013 Chinese Renminbi Notes, Due Through 2016, 6.15%-6.77% [Member]	Sep. 30, 2014 5% Notes Due 2017 [Member]	Sep. 30, 2013 5% Notes Due 2017 [Member]	Sep. 30, 2009 5% Notes Due 2017 [Member]	Sep. 30, 2014 2.55% Notes Due 2018 [Member]	Sep. 30, 2013 2.55% Notes Due 2018 [Member]	Jul. 31, 2012 2.55% Notes Due 2018 [Member]	Sep. 30, 2014 3.7% Notes Due 2022 [Member]	Sep. 30, 2013 3.7% Notes Due 2022 [Member]	Jul. 31, 2012 3.7% Notes Due 2022 [Member]	Sep. 30, 2014 Notes Due 2019, 7.42% [Member]	Sep. 30, 2013 Notes Due 2019, 7.42% [Member]	Sep. 30, 2014 Notes Due 2022, 8.35% - 8.47% [Member]	Sep. 30, 2013 Notes Due 2022, 8.35% - 8.47% [Member]	Sep. 30, 2014 Notes Due 2028, 6.57%-7.28% [Member]	Sep. 30, 2013 Notes Due 2028, 6.57%-7.28% [Member]	Sep. 30, 2013 Guarantee Of Employee Stock Option Plan Note 8.29% [Member]	Sep. 30, 2014 Chinese Renminbi Notes, Due Through 2018, 4.63%-6.15% [Member]	Sep. 30, 2013 Chinese Renminbi Notes, Due Through 2018, 4.63%-6.15% [Member]	Sep. 30, 2014 Capital Lease Obligations, Due Through 2031 [Member]	Sep. 30, 2013 Capital Lease Obligations, Due Through 2031 [Member]
Debt Instrument [Line Items]
Line of credit			$ 0	$ 0
Notes					28	47	300	300		250	250		350	350									31	16
Total variable rate debt	28	47
Total Medium Term Notes	53	53														30	30	15	15	8	8
ESOP Note, 8.29%																						2
Total debt	984	971
Capital lease obligations, due through 2031	17	18																							17	18
Unamortized debt discount	(1)	(2)							(2)			(1)			(1)
Total debt	1,028	1,034
Total debt	1,028	1,034
Less current portion of long-term debt	(24)	(14)
Total long-term debt	$ 1,004	$ 1,020