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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 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Loss Contingencies [Line Items]        
Environmental expense $ 1 $ 2 $ 11 $ 3
Legal expense 1 0 1 1
Total expense $ 2 $ 2 $ 12 $ 4
Environmental Remediation Expense, before Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration] Selling, General and Administrative Expense Selling, General and Administrative Expense Selling, General and Administrative Expense Selling, General and Administrative Expense
Insurance receivable $ 0 $ 0 $ 0 $ (1)
Total expense, net of receivable activity $ 2 $ 2 $ 12 $ 3