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Acquisitions and Divestitures (Tables)
3 Months Ended
Dec. 31, 2019
Business Combinations [Abstract]  
Summary of Consideration Paid and Assets and Liabilities Acquired :
(In millions)20192018
Property, plant and equipment$—  $ 
Goodwill 21  
Intangible assets (a)
Reacquired franchise rights  
Customer relationships—   
Trademarks and trade names—   
Net assets acquired$ $30