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Acquisitions and Divestitures (Tables)
6 Months Ended
Mar. 31, 2020
Business Combinations [Abstract]  
Summary of Consideration Paid and Assets and Liabilities Acquired :
(In millions)20202019
Property, plant and equipment$ $ 
Goodwill 24  
Intangible assets (a)
Reacquired franchise rights  
Customer relationships—   
Trademarks and trade names—   
     Other—   
Net assets acquired$11  $35