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Acquisitions and Divestitures - Narrative (Details)
$ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2018
numberOfFranchiseServiceCenters
Jul. 13, 2018
USD ($)
numberOfFormerFranchiseCenters
Oct. 02, 2017
USD ($)
numberOfFormerFranchiseCenters
Jan. 31, 2017
USD ($)
service_center_store
Dec. 31, 2017
USD ($)
Sep. 30, 2019
USD ($)
service_center_store
numberOfFormerFranchiseCenters
Sep. 30, 2018
USD ($)
service_center_store
numberOfFormerFranchiseCenters
Sep. 30, 2017
USD ($)
service_center_store
numberOfFormerFranchiseCenters
Sep. 30, 2016
USD ($)
Nov. 30, 2017
Business Acquisition [Line Items]                    
Number of service center stores | service_center_store           60 136 43    
Purchase price           $ 78 $ 125 $ 72    
Number of former franchise service center stores acquired | numberOfFormerFranchiseCenters           5 4 14    
Number of service center stores acquired in single and multi-store transactions | service_center_store           24 3 1    
Payments for business acquisition                 $ 4  
Quick Lubes | Disposal Group, Disposed of by Sale, Not Discontinued Operations                    
Business Acquisition [Line Items]                    
Gain on sale           $ 1 $ 2      
Number of service center stores sold to franchisee | service_center_store             2      
THAILAND                    
Business Acquisition [Line Items]                    
Equity method ownership percentage                   70.00%
Additional ownership percentage of joint venture, purchased         30.00%          
Consideration paid to acquire additional interest in subsidiary         $ 16          
Oil Changers, Inc.                    
Business Acquisition [Line Items]                    
Number of franchise service center stores acquired 31         29   7    
Henley Bluewater, LLC                    
Business Acquisition [Line Items]                    
Purchase price     $ 60              
Number of former franchise service center stores acquired | numberOfFormerFranchiseCenters     56              
Great Canadian Oil Change                    
Business Acquisition [Line Items]                    
Purchase price   $ 53                
Number of franchise service center stores acquired | numberOfFormerFranchiseCenters   73                
Time-It Lube                    
Business Acquisition [Line Items]                    
Number of service center stores | service_center_store       28            
Purchase price       $ 49