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Restructuring and Other Charges - Summary of Cost Saving Plan Activities (Details) - USD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Restructuring Cost and Reserve [Line Items]    
Accrued balance, beginning of the period $ 59 $ 108
Charges 53 18
Cash payments (44) (87)
Non-cash and other adjustments (3) 2
Accrued balance, beginning of the period 65 41
Total costs incurred to date as of January 31, 2019 1,704  
Reflected in Consolidated Condensed Balance Sheets    
Other accrued liabilities 64  
Other non-current liabilities 1  
Fiscal 2017 Plan | Severance    
Restructuring Cost and Reserve [Line Items]    
Accrued balance, beginning of the period 50 76
Charges 47 12
Cash payments (35) (60)
Non-cash and other adjustments (3) 2
Accrued balance, beginning of the period 59 30
Total costs incurred to date as of January 31, 2019 300  
Reflected in Consolidated Condensed Balance Sheets    
Other accrued liabilities 59  
Other non-current liabilities 0  
Fiscal 2017 Plan | Infrastructure and other    
Restructuring Cost and Reserve [Line Items]    
Accrued balance, beginning of the period 0 19
Charges 6 6
Cash payments (6) (25)
Non-cash and other adjustments 0 0
Accrued balance, beginning of the period 0 0
Total costs incurred to date as of January 31, 2019 87  
Reflected in Consolidated Condensed Balance Sheets    
Other accrued liabilities 0  
Other non-current liabilities 0  
Other prior year plans    
Restructuring Cost and Reserve [Line Items]    
Accrued balance, beginning of the period 9 13
Charges 0 0
Cash payments (3) (2)
Non-cash and other adjustments 0 0
Accrued balance, beginning of the period 6 $ 11
Total costs incurred to date as of January 31, 2019 1,317  
Reflected in Consolidated Condensed Balance Sheets    
Other accrued liabilities 5  
Other non-current liabilities $ 1