Restructuring and Other Charges - Summary of Restructuring Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2017
Restructuring Reserve [Roll Forward]
Accrued Balance, beginning of period	$ 58	$ 63	$ 225
Charges	227	175	63
Cash payments	(134)	(157)	(220)
Non-cash and other adjustments	(43)	(23)	(5)
Accrued Balance, end of period	108	58	63
Total costs incurred to date				$ 1,552
Accrued Balance	58	63	225	108
Other Accrued Liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	107
Accrued Balance	107			107
Other non-current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	1
Accrued Balance	1			1
Fiscal 2017 Plan | Severance
Restructuring Reserve [Roll Forward]
Accrued Balance, beginning of period	24	0	0
Charges	117	24	0
Cash payments	(68)	0	0
Non-cash and other adjustments	3	0	0
Accrued Balance, end of period	76	24	0
Total costs incurred to date				141
Accrued Balance	24	0	0	76
Fiscal 2017 Plan | Severance | Other Accrued Liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	76
Accrued Balance	76			76
Fiscal 2017 Plan | Severance | Other non-current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	0
Accrued Balance	0			0
Fiscal 2017 Plan | Infrastructure and other
Restructuring Reserve [Roll Forward]
Accrued Balance, beginning of period	0	0	0
Charges	94	0	0
Cash payments	(23)	0	0
Non-cash and other adjustments	(52)	0	0
Accrued Balance, end of period	19	0	0
Total costs incurred to date				94
Accrued Balance	0	0	0	19
Asset impairment charges	52
Fiscal 2017 Plan | Infrastructure and other | Other Accrued Liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	19
Accrued Balance	19			19
Fiscal 2017 Plan | Infrastructure and other | Other non-current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	0
Accrued Balance	0			0
Fiscal 2015 Plan | Infrastructure and other
Restructuring Reserve [Roll Forward]
Accrued Balance, beginning of period	4	0	0
Charges	0	27	0
Cash payments	(2)	(4)	0
Non-cash and other adjustments	0	(19)	0
Accrued Balance, end of period	2	4	0
Total costs incurred to date				27
Accrued Balance	4	0	0	2
Fiscal 2015 Plan | Infrastructure and other | Other Accrued Liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	2
Accrued Balance	2			2
Fiscal 2015 Plan | Infrastructure and other | Other non-current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	0
Accrued Balance	0			0
Fiscal 2015 Plan | Severance and PRP
Restructuring Reserve [Roll Forward]
Accrued Balance, beginning of period	21	39	0
Charges	15	117	39
Cash payments	(36)	(122)	0
Non-cash and other adjustments	6	(13)	0
Accrued Balance, end of period	6	21	39
Total costs incurred to date				171
Accrued Balance	21	39	0	6
Fiscal 2015 Plan | Severance and PRP | Other Accrued Liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	6
Accrued Balance	6			6
Fiscal 2015 Plan | Severance and PRP | Other non-current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	0
Accrued Balance	0			0
Fiscal 2012 Plan | Infrastructure and other
Restructuring Reserve [Roll Forward]
Accrued Balance, beginning of period	2	3	7
Charges	0	0	1
Cash payments	0	(1)	(4)
Non-cash and other adjustments	0	0	(1)
Accrued Balance, end of period	2	2	3
Total costs incurred to date				44
Accrued Balance	2	3	7	2
Fiscal 2012 Plan | Infrastructure and other | Other Accrued Liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	1
Accrued Balance	1			1
Fiscal 2012 Plan | Infrastructure and other | Other non-current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	1
Accrued Balance	1			1
Fiscal 2012 Plan | Severance and EER
Restructuring Reserve [Roll Forward]
Accrued Balance, beginning of period	7	21	218
Charges	1	7	23
Cash payments	(5)	(30)	(216)
Non-cash and other adjustments	0	9	(4)
Accrued Balance, end of period	3	7	21
Total costs incurred to date				1,075
Accrued Balance	7	$ 21	$ 218	3
Fiscal 2012 Plan | Severance and EER | Other Accrued Liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	3
Accrued Balance	3			3
Fiscal 2012 Plan | Severance and EER | Other non-current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	0
Accrued Balance	$ 0			$ 0