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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Oct. 31, 2019
Jul. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.625%      
Asset impairment charges $ 0 $ 2    
Goodwill $ 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%
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%
Senior Notes [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage       6.625%