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Debt - Summary of Current and Long-term Debt (Details) - USD ($) $ in Millions		Jun. 30, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Carrying value of debt		$ 2,483	$ 2,615
Other	[1]	(19)	(23)
Total debt		2,532	2,819
Short-term debt (includes current portion of long-term debt)		(82)	(235)
Long-term debt (less current portion)		2,450	2,584
Notes due 2022 [Member]
Debt Instrument [Line Items]
Carrying value of debt		1,083	1,082
Term Loan B due 2024 [Member]
Debt Instrument [Line Items]
Carrying value of debt		594	599
Notes due 2043 [Member]
Debt Instrument [Line Items]
Carrying value of debt		376	376
2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Carrying value of debt			173
Term Loan A due 2022 [Member]
Debt Instrument [Line Items]
Carrying value of debt		250	250
Term Loan A due 2020 [Member]
Debt Instrument [Line Items]
Carrying value of debt		120	250
Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Carrying value of debt		71	56
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Carrying value of debt		52	51
Medium-term Notes [Member]
Debt Instrument [Line Items]
Carrying value of debt		$ 5	$ 5
[1] Other includes $22 million and $25 million of debt issuance cost discounts as of June 30, 2018 and September 30, 2017, respectively.

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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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