Debt Obligations - Schedule of Long Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2017	Sep. 30, 2017
Debt Instrument [Line Items]
Short-term debt	$ 0	$ 75
Other	(10)	(11)
Total debt	1,166	1,124
Current portion of long-term debt	19	15
Long-term debt	1,147	1,034
Debt issuance cost discounts	12	13
Debt acquired through acquisitions	2	2
Line of Credit \| Revolver
Debt Instrument [Line Items]
Debt gross	0	0
2025 Notes \| Senior Notes
Debt Instrument [Line Items]
Debt gross	400	400
2024 Notes \| Senior Notes
Debt Instrument [Line Items]
Debt gross	375	375
Term Loans \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Debt gross	281	285
Trade Receivables Facility \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	$ 120
Line of Credit \| Trade Receivables Facility \| 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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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(22))
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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. 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 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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