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Debt - Summary of Current and Long-term Debt (Details) - USD ($) $ in Millions		Dec. 31, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Carrying value of debt		$ 1,513	$ 1,513
Other	[1]	14	15
Total debt		1,681	1,667
Short-term debt (includes current portion of long-term debt)		(179)	(166)
Long-term debt (less current portion)		1,502	1,501
Notes due 2022 [Member]
Debt Instrument [Line Items]
Carrying value of debt		1,081	1,080
Notes due 2043 [Member]
Debt Instrument [Line Items]
Carrying value of debt		374	374
Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Carrying value of debt		157	144
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Carrying value of debt		$ 55	$ 54
[1] Includes $11 million and $12 million of debt issuance cost discounts as of December 31, 2019 and September 30, 2019, respectively. Additionally, as December 31, 2019 and September 30, 2019, Other included a European short-term loan facility with an outstanding balance of $22 million for each period.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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