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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Oct. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Asset impairment charges $ 1 $ 1 $ 3 $ 3  
Goodwill $ 38   $ 38   $ 38
Cash and Cash Equivalents, Maturity Term 90 days        
Marketable Securities, Maturity Term 90 days        
Tax Exempt Bond [Member] | Manufacturing Operations [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 6.75%   6.75%    
Tax Exempt Bond [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 6.75%   6.75%    
Senior Notes [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 6.63%   6.63%