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Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2017
Apr. 30, 2016
Oct. 31, 2016
May 31, 2016
Schedule of Equity Method Investments [Line Items]            
Carrying value of investment in H3C $ 2,620   $ 2,620   $ 2,648  
Loss from equity interests 3 $ 0 25 $ 0    
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%
Loss from equity interests $ 3   $ 25      
Amortization of basis difference 38   73      
Allocated portion 35   48      
H3C | Unisplendour            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage           51.00%
H3C | Equity Method Investee            
Schedule of Equity Method Investments [Line Items]            
Revenue 253   513      
Purchases 66   157      
Payable $ 57   $ 57   $ 71