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Debt and Financing Arrangements - Long-term Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Less: debt issuance costs	$ (55)	$ (56)
Gross long-term debt	4,105	3,716
Less: current portion	8	8
Net long-term debt	4,097	3,708
Short-term debt	202	22
Other short-term borrowings	$ 8	$ 22
Weighted average interest rate on short-term debt outstanding (as percent)	1.60%	290.00%
European Investment Bank Loan - EURIBOR plus 1.58% due in 2022 | EURIBOR
Debt Instrument [Line Items]
Basis spread (as percent)	1.58%
Revolving credit facility | Term Loan B - LIBOR plus 4.00% due in 2024
Debt Instrument [Line Items]
Long-term debt, gross	$ 790	$ 798
Revolving credit facility | Term Loan B - LIBOR plus 4.00% due in 2024 | LIBOR
Debt Instrument [Line Items]
Interest rate (as percent)	4.00%
Unsecured debt | 4.875% Notes due in 2026
Debt Instrument [Line Items]
Long-term debt, gross	$ 797	900
Interest rate (as percent)	4.875%
Unsecured debt | 3.50% Notes due in 2024
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,173	1,094
Interest rate (as percent)	3.50%
Unsecured debt | 7.00% Notes due in 2026
Debt Instrument [Line Items]
Long-term debt, gross	$ 800	800
Interest rate (as percent)	7.00%
Unsecured debt | 9.00% Notes due in 2025
Debt Instrument [Line Items]
Long-term debt, gross	$ 600	0
Interest rate (as percent)	9.00%
Unsecured debt | European Investment Bank Loan - EURIBOR plus 1.58% due in 2022
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	180
Short-term debt	$ 194	$ 0
Unsecured debt | European Investment Bank Loan - EURIBOR plus 1.58% due in 2022 | EURIBOR
Debt Instrument [Line Items]
Basis spread (as percent)	1.58%

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