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Debt and Financing Arrangements - Net Financing Charges (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Debt Disclosure [Abstract]      
Interest expense, net of capitalized interest costs $ 216 $ 167 $ 142
Banking fees and debt issuance cost amortization 18 26 7
Interest income (11) (11) (5)
Gain on partial extinguishment of debt (3) 0 0
Net financing charges $ 220 $ 182 $ 144