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Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Oct. 31, 2016
May 31, 2016
Schedule of Equity Method Investments [Line Items]            
Carrying value of investment in H3C $ 2,626   $ 2,626   $ 2,648  
Earnings (loss) from equity interests 1 $ (72) (24) $ (72)    
Equity Method Investee | H3C            
Schedule of Equity Method Investments [Line Items]            
Sales 289   802      
Purchases 68   225      
Net payables 60   60   71  
Unisplendour | H3C            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage           51.00%
H3C            
Schedule of Equity Method Investments [Line Items]            
Carrying value of investment in H3C $ 2,600   $ 2,600   $ 2,600  
Ownership percentage 49.00%   49.00%   49.00% 49.00%
Earnings (loss) from equity interests $ 1   $ (24)      
Share of H3C's net income 40   88      
Amortization of basis difference $ 39   $ 112