Stock-Based Compensation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Stock-Based Compensation
Stock-based compensation expense	$ 160	$ 132	$ 476	$ 432
Income tax benefit	(52)	(42)	(154)	(138)
Stock-based compensation expense, net of tax	$ 108	$ 90	$ 322	$ 294
Restricted Stock Awards
Stock-Based Compensation
Number of shares through acquisition (in shares)	8,000
Weighted- average grant date fair value assumed (in dollars per share)	$ 33.00
Shares
Outstanding at beginning of period (in shares)			40,808
Granted (in shares)			25,532
Vested (in shares)			(18,996)
Forfeited (in shares)			(2,760)
Outstanding at end of period (in shares)	44,584		44,584
Weighted-Average Grant Date Fair Value Per Share
Outstanding at beginning of period (in dollars per share)			$ 24
Granted (in dollars per share)			36
Vested (in dollars per share)			25
Forfeited (in dollars per share)			28
Outstanding at end of period (in dollars per share)	$ 30		$ 30
Unrecognized pre-tax stock-based compensation expense and recognition period
Unrecognized pre-tax stock-based compensation expense	$ 847		$ 847
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized			1 year 4 months 24 days
Stock Options
Unrecognized pre-tax stock-based compensation expense and recognition period
Unrecognized pre-tax stock-based compensation expense	$ 61		$ 61
Remaining weighted-average vesting period over which pre-tax stock-based compensation expense is expected to be recognized			1 year 8 months 12 days
Weighted-average fair value and the assumptions used to measure fair value
Weighted- average fair value of grants per option (in dollars per share)	$ 6.28	$ 7.53	$ 7.90	$ 7.44
Expected volatility (as a percent)	26.70%	27.60%	26.30%	33.20%
Risk-free interest rate (as a percent)	1.60%	1.60%	1.70%	1.80%
Expected dividend yield (as a percent)	2.30%	1.90%	1.80%	2.10%
Expected term in years	5 years 2 months 12 days	5 years 2 months 12 days	5 years 9 months 18 days	5 years 8 months 12 days
Shares
Outstanding at beginning of period (in shares)			57,853
Granted and assumed through acquisitions (in shares)			8,290
Exercised (in shares)			(10,918)
Forfeited/cancelled/expired (in shares)			(16,483)
Outstanding at end of period (in shares)	38,742		38,742
Vested and expected to vest at end of period (in shares)	36,443		36,443
Exercisable at end of period (in shares)	17,635		17,635
Weighted-Average Exercise Price
Outstanding at beginning of period (in dollars per share)			$ 27
Granted and assumed through acquisition (in dollars per share)			37
Exercised (in dollars per share)			19
Forfeited/cancelled/expired (in dollars per share)			40
Outstanding at end of period (in dollars per share)	$ 26		26
Vested and expected to vest at end of period (in dollars per share)	26		26
Exercisable at end of period (in dollars per share)	$ 25		$ 25
Weighted-Average Remaining Contractual Term
Outstanding at end of period			5 years 3 months 18 days
Vested and expected to vest at end of period			5 years 3 months 18 days
Exercisable at end of period			4 years 1 month 6 days
Aggregate Intrinsic Value
Outstanding at end of period	$ 275		$ 275
Vested and expected to vest at end of period	260		260
Exercisable at end of period	142		142
Options exercised	$ 23		$ 192