Business Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Sep. 30, 2014
Segment Reporting Information [Line Items]
Total assets	$ 2,317		$ 2,502
Less: Accounts receivable sold under off-balance sheet factoring programs	(254)	[1]	(244)	[1]
Commercial Truck & Industrial
Segment Reporting Information [Line Items]
Total assets	1,657		1,755
Aftermarket & Trailer
Segment Reporting Information [Line Items]
Total assets	441		458
Total segment assets
Segment Reporting Information [Line Items]
Total assets	2,098		2,213
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 473	[2]	$ 533	[2]

[1] At March 31, 2015 and September 30, 2014, segment assets include $254 million and $244 million, respectively, of accounts receivable sold under off-balance sheet accounts receivable factoring programs (see Note 8). These sold receivables are included in segment assets as the CODM reviews segment assets inclusive of these balances.

[2] Corporate assets consist primarily of cash, deferred income taxes and prepaid pension costs.