Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Nov. 01, 2015	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016	Jan. 25, 2017
Stock-Based Compensation
Stock-based compensation expense		$ 126	$ 103	$ 278	$ 230
Income tax benefit		(41)	(30)	(89)	(67)
Stock-based compensation expense from continuing operations, net of tax		85	73	189	163
Separation costs		141	91	226	170
Restructuring charges		$ 118	87	$ 234	253
Restricted Stock Awards
Shares
Outstanding at beginning of period (in shares)				57,321,000
Granted and assumed through acquisition (in shares)				21,405,000
Additional shares granted due to conversion (in shares)				12,902,000
Vested (in shares)				(36,473,000)
Forfeited (in shares)				(2,079,000)
Outstanding at end of period (in shares)		53,076,000		53,076,000
Weighted-Average Grant Date Fair Value Per Share
Outstanding at beginning of period (in dollars per share)				$ 15
Granted and assumed through acquisition (in dollars per share)				21
Additional shares granted due to conversion (in dollars per share)				18
Vested (in dollars per share)				16
Forfeited (in dollars per share)				17
Outstanding at end of period (in dollars per share)		$ 18		$ 18
Unrecognized pre-tax stock-based compensation expense and recognition period
Unrecognized pre-tax stock-based compensation expense		$ 524		$ 524
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized				1 year 7 months 12 days
Stock Options
Unrecognized pre-tax stock-based compensation expense and recognition period
Unrecognized pre-tax stock-based compensation expense		$ 53		$ 53
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized				1 year 4 months 12 days
Weighted-average fair value and the assumptions used to measure fair value
Weighted- average fair value (in dollars per share)				$ 6
Expected volatility				25.70%
Risk-free interest rate				2.00%
Expected dividend yield				1.00%
Expected term in years				6 years 1 month 6 days
Shares
Outstanding at beginning of period (in shares)				57,498,000
Granted and assumed through acquisition (in shares)				5,242,000
Additional shares granted due to conversion (in shares)				12,574,000
Exercised (in shares)				(16,281,000)
Forfeited/cancelled/expired (in shares)				(8,389,000)
Outstanding at end of period (in shares)		50,644,000		50,644,000
Vested and expected to vest at end of period (in shares)		49,682,000		49,682,000
Exercisable at end of period (in shares)		28,811,000		28,811,000
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share)				$ 15
Granted and assumed through acquisition (in dollars per share)				24
Additional shares granted due to conversion (in dollars per share)				12
Exercised (in dollars per share)				14
Forfeited/cancelled/expired (in dollars per share)				16
Outstanding at end of period (in dollars per share)		$ 12		12
Vested and expected to vest at end of period (in dollars per share)		12		12
Exercisable at end of period (in dollars per share)		$ 11		$ 11
Options assumed (in shares)				8,000,000
Awards assumed (in dollars per share)				$ 16
Weighted-Average Remaining Contractual Term
Outstanding at end of period				5 years
Vested and expected to vest at end of period				5 years
Exercisable at end of period				3 years 8 months 12 days
Aggregate Intrinsic Value
Outstanding at end of period		$ 329		$ 329
Vested and expected to vest at end of period		324		324
Exercisable at end of period		224		224
Options exercised		47		120
The Plan
Stock-Based Compensation
Number of shares authorized (in shares)	260,000,000					210,000,000
Vesting period	3 years
The Plan | One-time retention stock awards to certain executives
Stock-Based Compensation
Vesting period	3 years
Total grant date fair value of options vested	$ 137
The Plan
Stock-Based Compensation
Separation costs		21		33
Restructuring charges		7		19
SGI | The Plan
Stock-Based Compensation
Restructuring charges		2		$ 7
Business Acquisitions | Restricted Stock Awards
Shares
Granted and assumed through acquisition (in shares)				11,000,000
Weighted-Average Grant Date Fair Value Per Share
Granted and assumed through acquisition (in dollars per share)				$ 18
Everett SpinCo
Stock-Based Compensation
Stock-based compensation expense		83		$ 95
Everett SpinCo | Restricted Stock Awards
Shares
Vested (in shares)				(9,000,000)
Forfeited (in shares)				(300,000)
Weighted-Average Grant Date Fair Value Per Share
Vested (in dollars per share)				$ 18
Forfeited (in dollars per share)				$ 18
Net loss from discontinued operations
Stock-Based Compensation
Stock-based compensation expense		67		$ 69
Net earnings (loss) from continuing operations
Stock-Based Compensation
Stock-based compensation expense		16		26
Scenario, Adjustment
Stock-Based Compensation
Stock-based compensation expense		$ 78	$ 35	$ 100	$ 73