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Debt and Financing Arrangements - Components of Net Financing Charges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Debt Disclosure [Abstract]        
Interest expense, net of capitalized interest costs $ 62 $ 97 $ 124 $ 188
Banking fees and bond cost amortization 5 7 10 13
Interest income (5) (6) (18) (13)
Net foreign exchange results for financing activities (3) 0 (5) (5)
Net financing charges $ 59 $ 98 $ 111 $ 183