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Contingencies (Tables)
9 Months Ended
Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Environmental Reserves
The following are the components of the Superfund and non-Superfund environmental reserves (in millions):
Superfund SitesNon-Superfund SitesTotal
Beginning Balance at September 30, 2020$11 $$16 
Payments and other(2)(1)(3)
Accruals— — — 
Ending Balance at June 30, 2021$$$13