Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Nov. 01, 2015	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Stock-Based Compensation
Stock-based compensation expense		$ 149	$ 117	$ 452	$ 353
Income tax benefit		(45)	(38)	(134)	(116)
Stock-based compensation expense, net of tax		104	79	318	237
Separation costs		135	255	305	458
Restructuring charges		$ 369	$ 24	$ 841	$ 404
Restricted Stock Awards
Shares
Outstanding at beginning of period (in shares)	0			0
Converted from former Parent's plan (in shares)				42,012,000
Granted (in shares)				31,956,000
Vested (in shares)				(9,637,000)
Forfeited (in shares)				(3,560,000)
Outstanding at end of period (in shares)		60,771,000		60,771,000
Weighted-Average Grant Date Fair Value Per Share
Outstanding at beginning of period (in dollars per share)	$ 0			$ 0
Converted from former Parent's plan (in dollars per share)				15
Granted (in dollars per share)				15
Vested (in dollars per share)				15
Forfeited (in dollars per share)				15
Outstanding at end of period (in dollars per share)		$ 15		$ 15
Unrecognized pre-tax stock-based compensation expense and recognition period
Unrecognized pre-tax stock-based compensation expense		$ 580		$ 580
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized				1 year 2 months 12 days
Restricted Stock Awards | One-time retention stock awards to certain executives
Shares
Granted (in shares)				5,000,000
Stock Options
Unrecognized pre-tax stock-based compensation expense and recognition period
Unrecognized pre-tax stock-based compensation expense		$ 76		$ 76
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized				1 year 10 months 12 days
Weighted-average fair value and the assumptions used to measure fair value
Weighted- average fair value (in dollars per share)		$ 5		$ 4
Expected volatility (as a percent)		28.40%		31.10%
Risk-free interest rate (as a percent)		1.20%		1.70%
Expected dividend yield (as a percent)		1.20%		1.50%
Expected term in years		5 years 3 months 12 days		5 years 4 months 12 days
Shares
Outstanding at beginning of period (in shares)	0			0
Converted from former Parent's plan (in shares)				42,579,000
Granted (in shares)				25,369,000
Exercised (in shares)				(4,861,000)
Forfeited/cancelled/expired (in shares)				(1,780,000)
Outstanding at end of period (in shares)		61,307,000		61,307,000
Vested and expected to vest at end of period (in shares)		59,118,000		59,118,000
Exercisable at end of period (in shares)		25,373,000		25,373,000
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 0			$ 0
Converted from former Parent's plan (in dollars per share)				15
Granted (in dollars per share)				15
Exercised (in dollars per share)				10
Forfeited/cancelled/expired (in dollars per share)				20
Outstanding at end of period (in dollars per share)		$ 15		15
Vested and expected to vest at end of period (in dollars per share)		15		15
Exercisable at end of period (in dollars per share)		$ 14		$ 14
Weighted-Average Remaining Contractual Term
Outstanding at end of period				5 years 8 months 12 days
Vested and expected to vest at end of period				5 years 8 months 12 days
Exercisable at end of period				4 years 1 month 12 days
Aggregate Intrinsic Value
Outstanding at end of period		$ 381		$ 381
Vested and expected to vest at end of period		369		369
Exercisable at end of period		194		194
Options exercised		22		$ 35
Stock Options | One-time retention stock awards to certain executives
Shares
Granted (in shares)				16,000,000
Stock Options | Minimum
Stock-Based Compensation
Vesting period				3 years
Stock Options | Maximum
Stock-Based Compensation
Vesting period				4 years
The Plan
Stock-Based Compensation
Number of shares authorized (in shares)	260,000,000
The Plan | One-time retention stock awards to certain executives
Stock-Based Compensation
Total grant date fair value of options vested	$ 137
Vesting period	3 years
Cash-settled awards and restricted stock awards | Minimum
Stock-Based Compensation
Vesting period				1 year
Cash-settled awards and restricted stock awards | Maximum
Stock-Based Compensation
Vesting period				3 years
The Plan
Stock-Based Compensation
Separation costs		15		$ 15
Restructuring charges		$ 5		$ 5