Restructuring and Other Charges - Summary of Cost Saving Plan Activities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jul. 31, 2021	Jul. 31, 2021	Jul. 31, 2020
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		$ 67	$ 142
Charges	$ 48	199	331
Cash payments		(148)	(309)
Non-cash and other adjustments		(32)	(51)
Accrued balance, beginning of the period	86	86	113
Total costs incurred to date as of July 31, 2021	2,454	2,454
Reflected in Consolidated Condensed Balance Sheets
Other current liabilities	86	86
Fiscal 2020 Plan | Severance and EER
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		55	76
Charges	28	164	325
Cash payments		(132)	(256)
Non-cash and other adjustments		(1)	(48)
Accrued balance, beginning of the period	86	86	97
Total costs incurred to date as of July 31, 2021	592	592
Reflected in Consolidated Condensed Balance Sheets
Other current liabilities	86	86
Fiscal 2020 Plan | Non-labor
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		0	0
Charges	20	35	5
Cash payments		(4)	(5)
Non-cash and other adjustments		(31)	0
Accrued balance, beginning of the period	0	0	0
Total costs incurred to date as of July 31, 2021	45	45
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		(12)	(48)
Non-cash and other adjustments		0	(3)
Accrued balance, beginning of the period	0	0	$ 16
Total costs incurred to date as of July 31, 2021	1,817	1,817
Reflected in Consolidated Condensed Balance Sheets
Other current liabilities	$ 0	$ 0