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Retirement and Post-Retirement Benefit Plans (Details 2) (USD $)
In Millions
3 Months Ended 6 Months Ended
Apr. 30, 2011
Apr. 30, 2010
Apr. 30, 2011
Apr. 30, 2010
Oct. 31, 2010
Pension Plans
         
Employer Contributions and Funding Policy          
Expected contribution to defined benefit plans in fiscal 2011         $ 747
Contributions to benefit plans     262    
Expected contribution to benefit plans as of balance sheet date 485   485    
U.S. Defined Benefit Plans
         
Net benefit (gain) cost          
Interest cost 149 144 297 289  
Expected return on plan assets (186) (165) (372) (331)  
Amortization and deferrals:          
Actuarial loss 8 7 17 14  
Net periodic benefit (gain) cost (29) (14) (58) (28)  
Net benefit (gain) cost (29) (14) (58) (28)  
Non-U.S. Defined Benefit Plans
         
Net benefit (gain) cost          
Service cost 89 82 174 168  
Interest cost 177 165 346 337  
Expected return on plan assets (225) (188) (438) (386)  
Reduction of United Kingdom pension obligation due to legislative changes 355        
Amortization and deferrals:          
Actuarial loss 60 53 122 109  
Prior service benefit (4) (3) (7) (5)  
Net periodic benefit (gain) cost 97 109 197 223  
Settlement 2   2    
Special termination benefits 6 11 8 11  
Net benefit (gain) cost 105 120 207 234  
U.S. non-qualified plan participants
         
Employer Contributions and Funding Policy          
Expected contribution to defined benefit plans in fiscal 2011         30
Contributions to benefit plans     14    
Expected contribution to benefit plans as of balance sheet date 16   16    
Post-Retirement Benefit Plans
         
Net benefit (gain) cost          
Service cost 2 3 4 6  
Interest cost 9 12 17 24  
Expected return on plan assets (9) (8) (18) (15)  
Amortization and deferrals:          
Actuarial loss   5 1 10  
Prior service benefit (20) (22) (41) (43)  
Net periodic benefit (gain) cost (18) (10) (37) (18)  
Curtailment gain   (13)   (13)  
Net benefit (gain) cost (18) (23) (37) (31)  
Employer Contributions and Funding Policy          
Expected contribution to defined benefit plans in fiscal 2011         40
Contributions to benefit plans     14    
Expected contribution to benefit plans as of balance sheet date $ 26   $ 26