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Litigation, Claims and Contingencies - Summary of Components of Environmental Remediation Expense Included within Selling, General and Administrative Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Environmental Expense And Liabilities [Abstract]    
Environmental expense $ 3 $ 12
Accretion 0 1
Legal expense 1 1
Total expense 4 14
Insurance receivable [1] (1) 0
Total expense, net of receivable activity $ 3 $ 14
[1] Activity of $0 denotes value less than $1 million.