Restructuring and Other Charges - Summary of Restructuring Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2019
Restructuring Reserve [Roll Forward]
Accrued Balance, beginning of period	$ 59	$ 108	$ 58
Charges	247	99	227
Cash payments	(140)	(175)	(134)
Non-cash and other adjustments	(24)	27	(43)
Accrued Balance, end of period	142	59	108
Total costs incurred to date				$ 1,898
Accrued Balance	142	59	108	142
Other current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	141
Accrued Balance	141			141
Other non-current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	1
Accrued Balance	1			1
Fiscal 2020 Plan | Severance and EER
Restructuring Reserve [Roll Forward]
Accrued Balance, beginning of period	0	0	0
Charges	82	0	0
Cash payments	0	0	0
Non-cash and other adjustments	(6)	0	0
Accrued Balance, end of period	76	0	0
Total costs incurred to date				82
Accrued Balance	76	0	0	76
Fiscal 2020 Plan | Severance and EER | Other current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	76
Accrued Balance	76			76
Fiscal 2020 Plan | Severance and EER | Other non-current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	0
Accrued Balance	0			0
Fiscal 2020 Plan | Infrastructure and other
Restructuring Reserve [Roll Forward]
Accrued Balance, beginning of period	0	0	0
Charges	0	0	0
Cash payments	0	0	0
Non-cash and other adjustments	0	0	0
Accrued Balance, end of period	0	0	0
Total costs incurred to date				0
Accrued Balance	0	0	0	0
Fiscal 2020 Plan | Infrastructure and other | Other current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	0
Accrued Balance	0			0
Fiscal 2020 Plan | Infrastructure and other | 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	19	0
Charges	28	(13)	94
Cash payments	(15)	(35)	(23)
Non-cash and other adjustments	(11)	29	(52)
Accrued Balance, end of period	2	0	19
Total costs incurred to date				109
Accrued Balance	2	0	19	2
Fiscal 2017 Plan | Infrastructure and other | Other current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	2
Accrued Balance	2			2
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 2017 Plan | Severance
Restructuring Reserve [Roll Forward]
Accrued Balance, beginning of period	50	76	24
Charges	137	112	117
Cash payments	(122)	(136)	(68)
Non-cash and other adjustments	(7)	(2)	3
Accrued Balance, end of period	58	50	76
Total costs incurred to date				390
Accrued Balance	58	50	76	58
Fiscal 2017 Plan | Severance | Other current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	58
Accrued Balance	58			58
Fiscal 2017 Plan | Severance | Other non-current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	0
Accrued Balance	0			0
Other prior year plans
Restructuring Reserve [Roll Forward]
Accrued Balance, beginning of period	9	13	34
Charges	0	0	16
Cash payments	(3)	(4)	(43)
Non-cash and other adjustments	0	0	6
Accrued Balance, end of period	6	9	13
Total costs incurred to date				1,317
Accrued Balance	6	$ 9	$ 13	6
Other prior year plans | Other current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	5
Accrued Balance	5			5
Other prior year plans | Other non-current liabilities
Restructuring Reserve [Roll Forward]
Accrued Balance, end of period	1
Accrued Balance	$ 1			$ 1