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Debt - Schedule of Short-Term Borrowings and Long Term Debt (Details) - USD ($)	Jun. 30, 2021	Jan. 14, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Current portion of long-term debt	$ 2,000,000		$ 0
Long-term debt	1,691,000,000		1,962,000,000
Debt issuance costs and discounts	(14,000,000)		(19,000,000)
Total debt	1,693,000,000		1,962,000,000
Senior Unsecured Notes Due 2031 [Member] \| 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]
Debt gross	0		800,000,000
Aggregate principal amount		$ 800,000,000
Term Loan \| Line of Credit
Debt Instrument [Line Items]
Debt gross	475,000,000		475,000,000
Term Loan \| Line of Credit \| Revolver
Debt Instrument [Line Items]
Debt gross	475,000,000
Long-term debt	0		0
Trade Receivables Facility \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Debt gross	175,000,000
Long-term debt	59,000,000		88,000,000
Construction Credit Facility [Member] \| CHINA
Debt Instrument [Line Items]
Long-term debt	$ 38,000,000		$ 18,000,000