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Debt - Trade Receivables Facility (Details) - USD ($)
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Debt Instrument [Line Items]      
Proceeds from borrowings $ 0 $ 100,000,000  
Repayments of long-term debt   $ 101,000,000  
Line of Credit | Trade Receivables Facility | Secured Debt      
Debt Instrument [Line Items]      
Original principal amount of debt     $ 175,000,000
Long-term debt outstanding amount 0   0
Line of Credit | Trade Receivables Facility | Secured Debt | Financing Subsidiary      
Debt Instrument [Line Items]      
Accounts receivable pledged as collateral $ 220,000,000   $ 259,000,000