Segment Information - Net Sales (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Net sales	$ 4,219	$ 4,494	$ 12,605	$ 13,294
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	(73)	(69)	(204)	(243)
Americas \| Operating segments
Segment Reporting Information [Line Items]
Net sales	2,010	1,946	5,860	5,673
EMEA \| Operating segments
Segment Reporting Information [Line Items]
Net sales	1,752	1,945	5,170	5,854
Asia \| Operating segments
Segment Reporting Information [Line Items]
Net sales	$ 530	$ 672	$ 1,779	$ 2,010

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration