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Commitments and Contingencies - Guarantees (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Stand-by letters of credit outstanding (less than) $ 1
Surety bonds  
Guarantor Obligations [Line Items]  
Surety bond outstanding amount 41
Guarantee obligations | Surety bonds  
Guarantor Obligations [Line Items]  
Surety bonds expire in fiscal 2019 8
Surety bonds expire in fiscal 2020 $ 33