Restructuring - Summary of Restructuring Plans (Detail) $ in Millions	3 Months Ended
	Jan. 31, 2017 USD ($)
Restructuring Cost and Reserve [Line Items]
Liability as of October 31, 2016	$ 484
Charges (reversals)	51
Cash payments	(179)
Non-cash items	(6)
Liability as of January 31, 2017	350
Total costs incurred to date as of January 31, 2017	5,462
Total expected costs to be incurred as of January 31, 2017	6,438
Fiscal 2015 Plan [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Liability as of October 31, 2016	352
Charges (reversals)	25
Cash payments	(135)
Non-cash items	(4)
Liability as of January 31, 2017	238
Total costs incurred to date as of January 31, 2017	815
Total expected costs to be incurred as of January 31, 2017	1,770
Fiscal 2015 Plan [Member] | Infrastructure and Other [Member]
Restructuring Cost and Reserve [Line Items]
Liability as of October 31, 2016	13
Charges (reversals)	28
Cash payments	(28)
Liability as of January 31, 2017	13
Total costs incurred to date as of January 31, 2017	179
Total expected costs to be incurred as of January 31, 2017	200
Fiscal 2012 Plan [Member]
Restructuring Cost and Reserve [Line Items]
Total costs incurred to date as of January 31, 2017	2,900
Fiscal 2012 Plan [Member] | Infrastructure and Other [Member]
Restructuring Cost and Reserve [Line Items]
Liability as of October 31, 2016	9
Charges (reversals)	1
Liability as of January 31, 2017	10
Total costs incurred to date as of January 31, 2017	401
Total expected costs to be incurred as of January 31, 2017	401
Fiscal 2012 Plan [Member] | Employee Severance and EER [Member]
Restructuring Cost and Reserve [Line Items]
Liability as of October 31, 2016	99
Charges (reversals)	1
Cash payments	(15)
Non-cash items	(2)
Liability as of January 31, 2017	83
Total costs incurred to date as of January 31, 2017	2,533
Total expected costs to be incurred as of January 31, 2017	2,533
Other Plans [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Liability as of October 31, 2016	1
Liability as of January 31, 2017	1
Total costs incurred to date as of January 31, 2017	427
Total expected costs to be incurred as of January 31, 2017	427
Other Plans [Member] | Infrastructure and Other [Member]
Restructuring Cost and Reserve [Line Items]
Liability as of October 31, 2016	10
Charges (reversals)	(4)
Cash payments	(1)
Liability as of January 31, 2017	5
Total costs incurred to date as of January 31, 2017	1,107
Total expected costs to be incurred as of January 31, 2017	$ 1,107