Segment Information - Additional Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018
Segment Reporting Information [Line Items]
Equity income (loss)	$ 64	$ 87	$ 209	$ 268
Depreciation	68	103	205	300
Capital Expenditures	98	138	350	404
Total Assets	10,574		10,574		$ 10,942
Operating segments | Americas
Segment Reporting Information [Line Items]
Equity income (loss)	1	6	2	9
Depreciation	27	35	78	105
Capital Expenditures	39	60	139	164
Total Assets	3,216		3,216
Operating segments | EMEA
Segment Reporting Information [Line Items]
Equity income (loss)	4	4	9	10
Depreciation	31	52	94	151
Capital Expenditures	51	69	181	216
Total Assets	2,760		2,760
Operating segments | Asia
Segment Reporting Information [Line Items]
Equity income (loss)	61	84	200	277
Depreciation	10	12	33	34
Capital Expenditures	8	9	30	24
Total Assets	3,488		3,488
Segment Reconciling Items
Segment Reporting Information [Line Items]
Equity income (loss)	(2)	(7)	(2)	(28)
Depreciation	0	4	0	10
Capital Expenditures	0	$ 0	0	$ 0
Total Assets	$ 1,110		$ 1,110