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Acquisitions and Divestitures - Summary of Consideration Paid and Assets and Liabilities Acquired (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Property, plant and equipment $ 0 $ 1
Goodwill 5 21
Net assets acquired $ 6 30
Weighted average amortization period 6 years  
Acquired Finite-Lived Intangible Assets [Line Items]    
Proceeds from sale of operations $ 3  
Reacquired franchise rights    
Business Acquisition [Line Items]    
Intangible assets 0 3
Customer relationships    
Business Acquisition [Line Items]    
Intangible assets 0 1
Trademarks and trade names    
Business Acquisition [Line Items]    
Intangible assets $ 1 $ 4