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Debt and Financing Arrangements - Components of Net Financing Charges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Debt Disclosure [Abstract]        
Interest expense, net of capitalized interest costs $ 55 $ 58 $ 167 $ 182
Banking fees and bond cost amortization 7 8 19 18
Interest income (1) (3) (7) (21)
Net foreign exchange results for financing activities (5) (5) (20) (10)
Net financing charges $ 56 $ 58 $ 159 $ 169