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Stock-based Compensation Plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Feb. 28, 2010
Plan 2004
Oct. 31, 2012
Plan 2004
Feb. 29, 2004
Plan 2004
Aug. 26, 2012
Non-Qualified Options
Executive Chairman and CEO
Oct. 31, 2012
Deferred Share Units
Oct. 31, 2012
Premium Share Units
Oct. 31, 2012
Stock Options
Oct. 31, 2011
Stock Options
Oct. 31, 2010
Stock Options
Oct. 31, 2012
Restricted Stock Units (RSUs) [Member]
Oct. 31, 2011
Restricted Stock Units (RSUs) [Member]
Oct. 31, 2010
Restricted Stock Units (RSUs) [Member]
Oct. 31, 2012
Cash Settled Performance Shares
Oct. 31, 2011
Cash Settled Performance Shares
Oct. 31, 2012
Cash-Settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       5,750,000   3,250,000                        
Share-based Compensation Arrangement by Share-based Payment Award, Additional Number of Shares Authorized       2,500,000                            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         1,975,576                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 1,289,000 1,069,000 599,000       500,000                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding Number               30,478 104,493                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Number Of Common Stock Delivered               1                    
Own-share Lending Arrangement, Shares, Issued 35,303                                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 14.73 $ 24.54 $ 17.16                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 1 $ 38 $ 20                              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate                   0.00% 0.00% 0.00%            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value                         10 20 9      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate                   55.60% 45.90% 53.20%       52.30% 47.30%  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period                               153,420 149,620 285,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value                               $ 50.52 $ 84.75 $ 37.10
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                   0.80% 2.00% 2.30%       0.80% 2.00%  
Share-based Compensation 19 36 24                              
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 23                                  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 8 months 12 days                                  
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options 2 40 30                              
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards                                   $ 6