Debt - Schedule of Long Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Debt gross	$ 1,333
Short-term debt	0	$ 75
Other	(10)	(11)
Total debt	1,322	1,124
Current portion of long-term debt	30	15
Long-term debt	1,292	1,034
Debt issuance cost discounts	11	13
Debt acquired through acquisitions	1	2
2025 Notes \| Senior Notes
Debt Instrument [Line Items]
Debt gross	400	400
2024 Notes \| Senior Notes
Debt Instrument [Line Items]
Debt gross	$ 375	375
Trade Receivables Facility \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Short-term debt		$ 75

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt classified as other.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net, and Other Long-term Debt

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