Restructuring and Other Charges - Summary of Cost Saving Plan Activities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jul. 31, 2017	Jul. 31, 2017	Jul. 31, 2016
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		$ 58	$ 63
Charges		171	139
Cash payments		(93)	(114)
Non-cash and other adjustments		(42)	(22)
Accrued balance, beginning of the period	$ 94	94	66
Total costs incurred to date as of July 31, 2017	1,496	1,496
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	93	93
Other non-current liabilities	1	1
Restructuring Costs [Abstract]
Restructuring charges	21
Fiscal 2017 Plan | Severance
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		24	0
Charges		95	0
Cash payments		(46)	0
Non-cash and other adjustments		4	0
Accrued balance, beginning of the period	77	77	0
Total costs incurred to date as of July 31, 2017	119	119
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	77	77
Other non-current liabilities	0	0
Restructuring Costs [Abstract]
Restructuring charges	14
Fiscal 2017 Plan | Infrastructure and other
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		0	0
Charges		60	0
Cash payments		(6)	0
Non-cash and other adjustments		(52)	0
Accrued balance, beginning of the period	2	2	0
Total costs incurred to date as of July 31, 2017	60	60
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	2	2
Other non-current liabilities	0	0
Restructuring Costs [Abstract]
Restructuring charges	2
Impairment of asset		52
Fiscal 2015 Plan | Infrastructure and other
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		4	0
Charges		0	27
Cash payments		(2)	(3)
Non-cash and other adjustments		0	(19)
Accrued balance, beginning of the period	2	2	5
Total costs incurred to date as of July 31, 2017	27	27
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	2	2
Other non-current liabilities	0	0
Restructuring Costs [Abstract]
Restructuring charges	0
Fiscal 2015 Plan | Severance and PRP
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		21	39
Charges		15	107
Cash payments		(35)	(83)
Non-cash and other adjustments		6	(12)
Accrued balance, beginning of the period	7	7	51
Total costs incurred to date as of July 31, 2017	171	171
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	7	7
Other non-current liabilities	0	0
Restructuring Costs [Abstract]
Restructuring charges	5
Fiscal 2012 Plan | Infrastructure and other
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		2	3
Charges		0	1
Cash payments		0	0
Non-cash and other adjustments		0	0
Accrued balance, beginning of the period	2	2	4
Total costs incurred to date as of July 31, 2017	44	44
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	1	1
Other non-current liabilities	1	1
Restructuring Costs [Abstract]
Restructuring charges	0
Fiscal 2012 Plan | Severance and EER
Restructuring Reserve [Roll Forward]
Accrued balance, beginning of the period		7	21
Charges		1	4
Cash payments		(4)	(28)
Non-cash and other adjustments		0	9
Accrued balance, beginning of the period	4	4	$ 6
Total costs incurred to date as of July 31, 2017	1,075	1,075
Reflected in Consolidated Condensed Balance Sheets
Other accrued liabilities	4	4
Other non-current liabilities	0	$ 0
Restructuring Costs [Abstract]
Restructuring charges	$ 0