Restructuring and Other Charges - Summary of Cost Saving Plan Activities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jul. 31, 2018	Jul. 31, 2018	Jul. 31, 2017
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		$ 108	$ 58
Charges (reversals)	$ (8)	56	171
Cash payments		(146)	(93)
Non-cash and other adjustments		28	(42)
Accrued balance, beginning of the period	46	46	94
Total costs incurred to date as of July 31, 2018	1,608	1,608
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	45	45
Other non-current liabilities	1	1
Fiscal 2017 Plan | Severance
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		76	24
Charges (reversals)	20	72	95
Cash payments		(110)	(46)
Non-cash and other adjustments		(2)	4
Accrued balance, beginning of the period	36	36	77
Total costs incurred to date as of July 31, 2018	213	213
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	36	36
Other non-current liabilities	0	0
Fiscal 2017 Plan | Infrastructure and other
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		19	0
Charges (reversals)	(28)	(16)	60
Cash payments		(32)	(6)
Non-cash and other adjustments		29	(52)
Accrued balance, beginning of the period	0	0	2
Total costs incurred to date as of July 31, 2018	78	78
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	0	0
Other non-current liabilities	0	0
Asset impairment charges	(29)	(29)	52
Fiscal 2015 Plan | Infrastructure and other
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		2	4
Charges (reversals)	0	0	0
Cash payments		(2)	(2)
Non-cash and other adjustments		0	0
Accrued balance, beginning of the period	0	0	2
Total costs incurred to date as of July 31, 2018	27	27
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	0	0
Other non-current liabilities	0	0
Fiscal 2015 Plan | Severance and PRP
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		6	21
Charges (reversals)	0	0	15
Cash payments		(2)	(35)
Non-cash and other adjustments		1	6
Accrued balance, beginning of the period	5	5	7
Total costs incurred to date as of July 31, 2018	171	171
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	5	5
Other non-current liabilities	0	0
Fiscal 2012 Plan | Infrastructure and other
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		2	2
Charges (reversals)	0	0	0
Cash payments		0	0
Non-cash and other adjustments		0	0
Accrued balance, beginning of the period	2	2	2
Total costs incurred to date as of July 31, 2018	44	44
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	1	1
Other non-current liabilities	1	1
Fiscal 2012 Plan | Severance and EER
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		3	7
Charges (reversals)	0	0	1
Cash payments		0	(4)
Non-cash and other adjustments		0	0
Accrued balance, beginning of the period	3	3	$ 4
Total costs incurred to date as of July 31, 2018	1,075	1,075
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	3	3
Other non-current liabilities	$ 0	$ 0