Product Warranties (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Product Warranties Disclosures [Abstract]
Product warranties transferred to liabilities held for sale	$ 2
Maximum length, in years, of a product warranty for it to be recorded in other current liabilities	1 year
Minimum length, in years, of a product warranty for it to be recorded in other noncurrent liabilities	1 year
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	278		301
Accruals for warranties issued during the period	272		224
Accruals from acquisitions and divestitures	(5)	[1]	(1)	[1]
Accruals related to pre-existing warranties (including changes in estimates)	(14)		(21)
Settlements made (in cash or in kind) during the period	(275)		(221)
Currency translation	0		(4)
Balance at end of period	$ 256		$ 278

[1] Fiscal 2013 includes $2 million of product warranties transferred to liabilities held for sale on the consolidated statement of financial position. Refer to Note 3, "Assets and Liabilities Held for Sale," of the notes to consolidated financial statements for further information regarding the Company's disposal groups classified as held for sale.