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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Debt Disclosure [Abstract]        
Interest expense, net of capitalized interest costs $ 58 $ 81 $ 182 $ 269
Banking fees and bond cost amortization 8 7 18 20
Loss on debt extinguishment 0 60 0 60
Interest income (3) (28) (21) (41)
Net foreign exchange results for financing activities (5) (1) (10) (6)
Net financing charges $ 58 $ 119 $ 169 $ 302