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Debt - Schedule of Long Term Debt (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Aug. 31, 2017
Debt Instrument [Line Items]
Debt gross	$ 1,708,000,000
Debt issuance cost discounts	14,000,000	$ 19,000,000
Total debt	1,694,000,000	1,962,000,000
Current portion of long-term debt	17,000,000	0
Long-term debt	1,677,000,000	1,962,000,000
Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Debt gross	475,000,000
Line of Credit \| Revolver
Debt Instrument [Line Items]
Long-term debt	0	0
Trade Accounts Receivable [Member] \| Revolver
Debt Instrument [Line Items]
Long-term debt	59,000,000	88,000,000
Senior Unsecured Notes Due 2031 \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	535,000,000	0
Senior Unsecured Notes Due 2030 [Domain] \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	600,000,000	600,000,000
2025 Notes \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount			$ 800,000,000
Debt gross	0	800,000,000
Term Loan \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Debt gross	475,000,000	475,000,000
Construction Loans [Member] \| CHINA
Debt Instrument [Line Items]
Long-term debt	$ 39,000,000	$ 18,000,000