Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Nov. 01, 2015	Jan. 31, 2017	Jan. 31, 2016	Jan. 25, 2017
Stock-Based Compensation
Stock-based compensation expense		$ 174	$ 165
Income tax benefit		(59)	(50)
Stock-based compensation expense, net of tax		115	115
Separation costs		276	79
Restructuring charges		$ 177	$ 311
Restricted Stock Awards
Shares
Outstanding at beginning of period (in shares)		57,321,000
Granted and assumed through acquisition (in shares)		10,077,000
Vested (in shares)		(24,209,000)
Forfeited (in shares)		(787,000)
Outstanding at end of period (in shares)		42,402,000
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)		24
Vested (in dollars per share)		15
Forfeited (in dollars per share)		16
Outstanding at end of period (in dollars per share)		$ 17
Unrecognized pre-tax stock-based compensation expense and recognition period
Unrecognized pre-tax stock-based compensation expense		$ 529
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized		1 year 3 months 18 days
Stock Options
Unrecognized pre-tax stock-based compensation expense and recognition period
Unrecognized pre-tax stock-based compensation expense		$ 63
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized		2 years
Weighted-average fair value and the assumptions used to measure fair value
Weighted- average fair value (in dollars per share)		$ 6
Expected volatility (as a percent)		25.70%
Risk-free interest rate (as a percent)		2.00%
Expected dividend yield (as a percent)		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)		4,888,000
Exercised (in shares)		(8,432,000)
Forfeited/cancelled/expired (in shares)		(368,000)
Outstanding at end of period (in shares)		53,586,000
Vested and expected to vest at end of period (in shares)		52,377,000
Exercisable at end of period (in shares)		34,524,000
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share)		$ 15
Granted and assumed through acquisition (in dollars per share)		25
Exercised (in dollars per share)		15
Forfeited/cancelled/expired (in dollars per share)		16
Outstanding at end of period (in dollars per share)		16
Vested and expected to vest at end of period (in dollars per share)		16
Exercisable at end of period (in dollars per share)		$ 14
Weighted-Average Remaining Contractual Term
Outstanding at end of period		5 years 1 month 6 days
Vested and expected to vest at end of period		5 years 1 month 6 days
Exercisable at end of period		4 years
Aggregate Intrinsic Value
Outstanding at end of period		$ 379
Vested and expected to vest at end of period		374
Exercisable at end of period		292
Options exercised		73
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		12
Restructuring charges		12
SGI | The Plan
Stock-Based Compensation
Restructuring charges		$ 5