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Debt - Summary of Current and Long-term Debt (Details) - USD ($) $ in Millions		Sep. 30, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Carrying value of debt		$ 1,513	$ 2,307
Other	[1]	15	5
Total debt		1,667	2,529
Short-term debt (includes current portion of long-term debt)		(166)	(254)
Long-term debt (less current portion and debt issuance costs)		1,501	2,275
Notes due 2022 [Member]
Debt Instrument [Line Items]
Carrying value of debt		1,080	1,083
Term Loan A due 2022 [Member]
Debt Instrument [Line Items]
Carrying value of debt			195
Term Loan B due 2024 [Member]
Debt Instrument [Line Items]
Carrying value of debt			593
Notes due 2043 [Member]
Debt Instrument [Line Items]
Carrying value of debt		374	376
2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Carrying value of debt			25
Accounts Receivable Securitization [Member]
Debt Instrument [Line Items]
Carrying value of debt		144	195
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Carrying value of debt		$ 54	52
Medium-term Notes [Member]
Debt Instrument [Line Items]
Carrying value of debt			$ 5
[1] Other includes $12 million and $21 million of debt issuance costs as of September 30, 2019 and 2018, respectively.  Additionally, as of September 30, 2019 and 2018, Other included a European short-term loan facility with an outstanding balances of $22 million and $23 million, 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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