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Debt - Summary of Current and Long-term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Debt Instrument [Line Items]    
Carrying value of debt $ 2,307 $ 2,615
Other [1] 5 (23)
Total debt 2,529 2,819
Short-term debt (includes current portion of long-term debt) (254) (235)
Long-term debt (less current portion and debt issuance costs) 2,275 2,584
Notes due 2022 [Member]    
Debt Instrument [Line Items]    
Carrying value of debt 1,083 1,082
Term Loan A due 2022 [Member]    
Debt Instrument [Line Items]    
Carrying value of debt 195 250
Term Loan B due 2024 [Member]    
Debt Instrument [Line Items]    
Carrying value of debt 593 599
Notes due 2043 [Member]    
Debt Instrument [Line Items]    
Carrying value of debt 376 376
Term Loan A due 2020 [Member]    
Debt Instrument [Line Items]    
Carrying value of debt 0 250
2017 Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Carrying value of debt 25 173
Accounts Receivable Securitization [Member]    
Debt Instrument [Line Items]    
Carrying value of debt 195 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 $21 million and $25 million of debt issuance costs as of September 30, 2018 and 2017, respectively. Additionally, as of September 30, 2018, other included a European short-term loan facility with an outstanding balance of $23 million.