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Debt and Other Financing Activities - Summary of Current and Long-term Debt (Details) - USD ($) $ in Millions		Mar. 31, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Carrying value of debt		$ 1,352	$ 1,622
Other	[1]	(13)	9
Total debt		1,336	1,970
Short-term debt (includes current portion of long-term debt)		0	(374)
Long-term debt (less current portion)		1,336	1,596
3.375% Senior Notes, due 2031 [Member]
Debt Instrument [Line Items]
Carrying value of debt		450	450
2.00% Senior Notes Due 2028 [Member]
Debt Instrument [Line Items]
Carrying value of debt		558	580
6.875% Notes due 2043 [Member]
Debt Instrument [Line Items]
Carrying value of debt		282	282
Term Loan A [Member]
Debt Instrument [Line Items]
Carrying value of debt		0	250
Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Carrying value of debt		0	117
6.50% Junior Subordinated Notes, Due 2029 [Member]
Debt Instrument [Line Items]
Carrying value of debt		59	57
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Carrying value of debt		$ 0	$ 225
[1] Includes $16 million and $17 million of debt issuance cost discounts as of March 31, 2022 and September 30, 2021, respectively. Additionally, at September 30, 2021, Other included a European short-term loan facility with an outstanding balance of $23 million.

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