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Contingencies (Tables)
9 Months Ended
Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Summary 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, 2019$11  $ $15  
Payments and other(3) (1) (4) 
Accruals   
Ending Balance at June 30, 2020$12  $ $16