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Debt - Summary of Current and Long-term Debt (Details) - USD ($) $ in Millions		Jun. 30, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Carrying value of debt		$ 2,299	$ 2,307
Other	[1]	8	5
Total debt		2,607	2,529
Short-term debt (includes current portion of long-term debt)		(332)	(254)
Long-term debt (less current portion)		2,275	2,275
Notes due 2022 [Member]
Debt Instrument [Line Items]
Carrying value of debt		1,083	1,083
Term Loan B due 2024 [Member]
Debt Instrument [Line Items]
Carrying value of debt		588	593
Notes due 2043 [Member]
Debt Instrument [Line Items]
Carrying value of debt		376	376
Term Loan A due 2022 [Member]
Debt Instrument [Line Items]
Carrying value of debt		195	195
2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Carrying value of debt		90	25
Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Carrying value of debt		214	195
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Carrying value of debt		$ 53	52
Medium-term Notes [Member]
Debt Instrument [Line Items]
Carrying value of debt			$ 5
[1] Includes $18 million and $21 million of debt issuance cost discounts as of June 30, 2019 and September 30, 2018, respectively, in addition to a European short-term loan facility with an outstanding balance of $23 million at both June 30, 2019 and September 30, 2018.

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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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