Financial Information by Segment (Financial Information by Reportable Segment) (Parenthetical) (Detail) (Unallocated and Other [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Royalties paid by equity affiliates, other operating revenues, the impact of corporate adjustments for unearned revenue, and unconsolidated equity affiliates	$ 29	$ 25	$ 67	$ 72
Other Products And Services [Member]
Segment Reporting Information [Line Items]
Royalties paid by equity affiliates, other operating revenues, the impact of corporate adjustments for unearned revenue, and unconsolidated equity affiliates	9	3	6	8
Shipping And Handling Fees [Member]
Segment Reporting Information [Line Items]
Royalties paid by equity affiliates, other operating revenues, the impact of corporate adjustments for unearned revenue, and unconsolidated equity affiliates	$ 20	$ 22	$ 61	$ 64