Reportable Segment Information - Sales by Geography as a Percentage of Consolidated Sales (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Sales	$ 2,981	$ 2,353	$ 2,390
Retail Services [Member]
Segment Reporting Information [Line Items]
Sales	1,221	883	822
Global Products [Member]
Segment Reporting Information [Line Items]
Sales	1,760	1,470	1,568
North America
Segment Reporting Information [Line Items]
Sales	2,273	1,828	1,816
North America | Retail Services [Member]
Segment Reporting Information [Line Items]
Sales	1,221	883	822
North America | Global Products [Member]
Segment Reporting Information [Line Items]
Sales	1,052	945	994
EMEA [Member]
Segment Reporting Information [Line Items]
Sales	219	169	181
EMEA [Member] | Retail Services [Member]
Segment Reporting Information [Line Items]
Sales	0	0	0
EMEA [Member] | Global Products [Member]
Segment Reporting Information [Line Items]
Sales	219	169	181
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Sales	358	273	285
Asia Pacific [Member] | Retail Services [Member]
Segment Reporting Information [Line Items]
Sales	0	0	0
Asia Pacific [Member] | Global Products [Member]
Segment Reporting Information [Line Items]
Sales	358	273	285
Latin America
Segment Reporting Information [Line Items]
Sales	131	83	108
Latin America | Retail Services [Member]
Segment Reporting Information [Line Items]
Sales	0	0	0
Latin America | Global Products [Member]
Segment Reporting Information [Line Items]
Sales	$ 131	$ 83	$ 108