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Restructuring and Other Charges - Summary of Cost Saving Plan Activities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2021
Apr. 30, 2021
Apr. 30, 2020
Restructuring Reserve [Roll Forward]      
Accrued balance, beginning of the period   $ 67 $ 142
Charges $ 34 151 285
Cash payments   (105) (247)
Non-cash and other adjustments   (11) (52)
Accrued balance, beginning of the period 102 102 128
Total costs incurred to date as of April 30, 2021 2,406 2,406  
Reflected in Consolidated Condensed Balance Sheets      
Other current liabilities 102 102  
Fiscal 2020 Plan | Severance and EER      
Restructuring Reserve [Roll Forward]      
Accrued balance, beginning of the period   55 76
Charges 30 136 282
Cash payments   (92) (205)
Non-cash and other adjustments   1 (49)
Accrued balance, beginning of the period 100 100 104
Total costs incurred to date as of April 30, 2021 564 564  
Reflected in Consolidated Condensed Balance Sheets      
Other current liabilities 100 100  
Fiscal 2020 Plan | Non-labor      
Restructuring Reserve [Roll Forward]      
Accrued balance, beginning of the period   0 0
Charges 4 15 2
Cash payments   (3) (2)
Non-cash and other adjustments   (12) 0
Accrued balance, beginning of the period 0 0 0
Total costs incurred to date as of April 30, 2021 25 25  
Reflected in Consolidated Condensed Balance Sheets      
Other current liabilities 0 0  
Fiscal 2020 Plan | Healthcare and medical savings account benefits      
Restructuring Reserve [Roll Forward]      
Non-cash and other adjustments   44  
Other prior-year Plans      
Restructuring Reserve [Roll Forward]      
Accrued balance, beginning of the period   12 66
Charges   0 1
Cash payments   (10) (40)
Non-cash and other adjustments   0 (3)
Accrued balance, beginning of the period 2 2 $ 24
Total costs incurred to date as of April 30, 2021 1,817 1,817  
Reflected in Consolidated Condensed Balance Sheets      
Other current liabilities $ 2 $ 2