Basis of Presentation and Summary of Significant Accounting Policies - Net Periodic Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales	$ 3,978	$ 4,003
Gross profit	(180)	(201)
Earnings (loss) before interest and income taxes	(54)	(101)
Other pension expense (income)	$ (2)	(1)
Effect of Change | Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales		1
Gross profit		1
Earnings (loss) before interest and income taxes		1
Other pension expense (income)		1
Effect of Change | Accounting Standards Update 2017-07 | Seating
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjusted EBITDA		$ 1