Debt and Other Obligations (Schedule of Long-Term Obligations) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Variable Rate Debt [Member]	Sep. 30, 2011 Variable Rate Debt [Member]	Sep. 30, 2012 Fixed Rate Debt [Member]	Sep. 30, 2011 Fixed Rate Debt [Member]	Sep. 30, 2012 Revolving Credit Facility Expiry 2016 [Member] Variable Rate Debt [Member]	Sep. 30, 2012 5.40% - 7.32% Chinese Renminbi Notes, due through 2016 [Member] Variable Rate Debt [Member]	Sep. 30, 2011 5.40% - 7.32% Chinese Renminbi Notes, due through 2016 [Member] Variable Rate Debt [Member]	Sep. 30, 2009 5% Notes Due 2016 [Member]	Sep. 30, 2012 5% Notes Due 2016 [Member] Fixed Rate Debt [Member]	Sep. 30, 2011 5% Notes Due 2016 [Member] Fixed Rate Debt [Member]	Jul. 31, 2012 2.55% Notes Due 2018 [Member]	Sep. 30, 2012 2.55% Notes Due 2018 [Member] Fixed Rate Debt [Member]	Sep. 30, 2012 3.7% Notes Due 2022 [Member] Fixed Rate Debt [Member]	Sep. 30, 2011 7.70% - 8.28% Notes Due 2012 [Member] Fixed Rate Debt [Member]	Sep. 30, 2012 7.42% Note Due 2018 [Member] Fixed Rate Debt [Member]	Sep. 30, 2011 7.42% Note Due 2018 [Member] Fixed Rate Debt [Member]	Sep. 30, 2012 8.346% - 8.47% Notes Due 2022 [Member] Fixed Rate Debt [Member]	Sep. 30, 2011 8.346% - 8.47% Notes Due 2022 [Member] Fixed Rate Debt [Member]	Sep. 30, 2012 6.57% - 7.28% Notes Due 2027 [Member] Fixed Rate Debt [Member]	Sep. 30, 2011 6.57% - 7.28% Notes Due 2027 [Member] Fixed Rate Debt [Member]	Dec. 31, 2003 5.25% Eurobond, Due 2013 [Member]	Sep. 30, 2012 5.25% Eurobond, Due 2013 [Member] Fixed Rate Debt [Member]	Sep. 30, 2011 5.25% Eurobond, Due 2013 [Member] Fixed Rate Debt [Member]	Sep. 30, 2012 8.29% ESOP Note Due 2013 [Member]	Sep. 30, 2011 8.29% ESOP Note Due 2013 [Member]	Sep. 30, 2012 8.29% ESOP Note Due 2013 [Member] Fixed Rate Debt [Member]	Sep. 30, 2011 8.29% ESOP Note Due 2013 [Member] Fixed Rate Debt [Member]	Sep. 30, 2012 6.10% - 6.65% Chinese Renminbi Notes, due 2014 [Member] Fixed Rate Debt [Member]	Sep. 30, 2011 6.10% - 6.65% Chinese Renminbi Notes, due 2014 [Member] Fixed Rate Debt [Member]	Sep. 30, 2011 2% Other Note Due 2027 [Member] Fixed Rate Debt [Member]	Sep. 30, 2012 Capital Lease Obligations [Member]	Sep. 30, 2011 Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital lease obligations	$ 16		$ 15																															$ 16	$ 15
Unamortized debt discount	(2)	(1)	(2)								(2)			(1)										(1)
Total debt	1,357		613	200	15	1,143	585	189	11	15		300	300		250	350									177	178	8	14	8	14	5	5	5
Less current portion of long-term debt	(185)		(57)
Medium Term Notes						53	83										30	30	30	15	15	8	8
Total long-term debt	$ 1,172		$ 556