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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Apr. 30, 2011
Apr. 30, 2010
Apr. 30, 2011
Apr. 30, 2010
Oct. 31, 2010
Stock Based Compensation Expense          
Stock-based compensation expense $ 147 $ 200 $ 327 $ 381  
Income tax benefit from stock-based compensation 61 64 104 122  
Performance-based Restricted Units (PRUs)
         
Share-based compensation arrangements by share-based payment award          
Performance period to determine share based awards (in years)     3    
Percentage of performance target, low end of range (as a percent)     0.00%    
Percentage of performance target, high end of range (as a percent)     200.00%    
Weighted average assumptions used to determine fair values          
Weighted-average grant date fair value of shares granted (in dollars per share)     $ 27.59 $ 57.13  
Expected or implied volatility (as a percent)     30.00% 38.00%  
Risk-free interest rate (as a percent)     0.38% 0.73%  
Dividend yield (as a percent)     0.75% 0.64%  
Expected life (in months)     19 22  
PRU and Restricted Stock Activity:          
Outstanding at the beginning of the period (in shares)     18,508    
Granted (in shares)     5,798    
Vested (in shares)     0    
Change in units due to performance and market conditions achievement for PRUs vested in the period (in shares)     0    
Forfeited (in shares)     (786)    
Outstanding at the end of the period (in shares) 23,520   23,520    
Outstanding Target shares assigned a fair value (in shares) 17,608   17,608    
Unrecognized pre-tax stock-based compensation expense 286   286    
Remaining weighted-average vesting period (in years)     1.3    
Special Incremental Performance-Based Restricted Units
         
Share-based compensation arrangements by share-based payment award          
Performance period to determine share based awards (in years)     3    
PRU and Restricted Stock Activity:          
Granted (in shares)     300    
Outstanding at the end of the period (in shares) 300   300    
Unrecognized pre-tax stock-based compensation expense 3   3    
Remaining weighted-average vesting period (in years)     2.5    
Stock Options
         
Weighted average assumptions used to determine fair values          
Weighted average fair value of grants per share (in dollars per share) $ 10.73 $ 14.12 $ 11.06 $ 14.19  
Expected or implied volatility (as a percent) 27.00% 27.00% 28.00% 28.00%  
Risk-free interest rate (as a percent) 2.16% 2.45% 1.97% 2.42%  
Dividend yield (as a percent) 0.77% 0.61% 0.76% 0.61%  
Expected life (in months) 60 61 60 61  
PRU and Restricted Stock Activity:          
Unrecognized pre-tax stock-based compensation expense 218   218    
Remaining weighted-average vesting period (in years)     1.9    
Option activity:          
Outstanding at the beginning of the period (in shares)     142,916    
Granted and assumed through acquisition (in shares)     1,026    
Exercised (in shares)     (30,828)    
Forfeited/cancelled/expired (in shares)     (2,398)    
Outstanding at the end of the period (in shares) 110,716   110,716    
Weighted-average exercise price of shares outstanding (in dollars per share) $ 29   $ 29   $ 28
Weighted-average exercise price of shares granted (in dollars per share) $ 22   $ 22    
Weighted-average exercise price of shares exercised (in dollars per share) $ 24   $ 24    
Weighted-average exercise price of shares forfeited, cancelled or expired (in dollars per share)     $ 41    
Weighted-average remaining contractual term of shares outstanding (in years)     2.8    
Aggregate intrinsic value of shares outstanding 1,444   1,444    
Shares vested and expected to vest (in shares) 109,586   109,586    
Weighted-average exercise price of shares vested and expected to vest (in dollars per share) $ 29   $ 29    
Weighted-average remaining contractual term of shares vested and expected to vest (in years)     2.7    
Aggregate intrinsic value of shares vested and expected to vest 1,428   1,428    
Shares exercisable (in shares) 102,792   102,792    
Weighted-average exercise price of exercisable options (in dollars per share) $ 29   $ 29    
Weighted-average remaining contractual term of exercisable options (in years)     2.3    
Aggregate intrinsic value of exercisable options 1,327   1,327    
Aggregate intrinsic value of options exercised 348   606    
Restricted Stock Awards
         
Weighted average assumptions used to determine fair values          
Weighted-average grant date fair value of shares granted (in dollars per share)     $ 43    
PRU and Restricted Stock Activity:          
Outstanding at the beginning of the period (in shares)     5,848    
Granted (in shares)     7,717    
Vested (in shares)     (2,412)    
Forfeited (in shares)     (310)    
Outstanding at the end of the period (in shares) 10,843   10,843    
Unrecognized pre-tax stock-based compensation expense $ 376   $ 376    
Remaining weighted-average vesting period (in years)     1.6    
Weighted-average grant date fair value, beginning of period (in dollars per share)     $ 45    
Weighted-average grant date fair value of shares vested (in dollars per share)     $ 46    
Weighted-average grant date fair value of shares forfeited (in dollars per share) $ 44   $ 44    
Weighted-average grant date fair value, end of period (in dollars per share) $ 43   $ 43