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Divestiture and Equity Method Investment (Details) - USD ($)
$ in Millions
6 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Jun. 30, 2020
Apr. 01, 2020
Jan. 13, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Building held-for-sale     $ 73    
Put and Call Options excercisable, percent         49.99%
Animal Care Business | Disposal Group, Held-for-sale, Not Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Purchase price       $ 110  
Net of dealer related fees and other transaction items       $ 104  
Distrivet          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Payments to acquire businesses, gross   $ 11      
Ownership interest   50.01%      
Forecast | Subsequent Event | Distrivet          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Payments to acquire businesses, gross $ 11        
Investments and Other | Distrivet          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Equity method investments     45    
Other, Net | Distrivet          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Realized gain (loss) on disposal     1    
Equity method investment, fair value disclosure     $ 47