Net Property (Details) - USD ($) $ in Millions		Mar. 31, 2017	Sep. 30, 2016
Property, Plant and Equipment [Line Items]
Property at cost		$ 1,266	$ 1,269
Less: accumulated depreciation		(836)	(830)
Net property	[1]	430	439
Land and land improvements
Property, Plant and Equipment [Line Items]
Property at cost		29	30
Buildings
Property, Plant and Equipment [Line Items]
Property at cost		230	231
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property at cost		846	839
Company-owned tooling
Property, Plant and Equipment [Line Items]
Property at cost		118	113
Construction in progress
Property, Plant and Equipment [Line Items]
Property at cost		$ 43	$ 56

[1] As of March 31, 2017, Assets and Liabilities held for sale were: (i) $1 million Cash and cash equivalents; (ii) $8 million Receivables, trade and other, net; (iii) $1 million Inventories; (iv) $1 million Goodwill; (v) $6 million Accounts and notes payable; and (vi) $2 million Noncontrolling interests. As of September 30, 2016, Assets and Liabilities held for sale were: (i) $1 million Cash and cash equivalents; (ii) $8 million Receivables, trade and other, net; (iii) $1 million Inventories; (iv) $3 million Net property; (v) $5 million Accounts and notes payable; and (vi) $3 million Noncontrolling interests.