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Commitments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Commitments      
Rent expense $ 1,012 $ 1,042 $ 1,062
Sublease rental income 37 38 46
Property under capital lease 882 577  
Accumulated depreciation on property under capital lease 453 454  
Minimum lease payments, sublease rental income      
Minimum lease payments, 2013 780    
Minimum lease payments, 2014 665    
Minimum lease payments, 2015 517    
Minimum lease payments, 2016 351    
Minimum lease payments, 2017 218    
Minimum lease payments, thereafter 805    
Minimum lease payments, total 3,336    
Less: Sublease rental income, 2013 (28)    
Less: Sublease rental income, 2014 (23)    
Less: Sublease rental income, 2015 (18)    
Less: Sublease rental income, 2016 (9)    
Less: Sublease rental income, 2017 (4)    
Less: Sublease rental income, thereafter (12)    
Sublease rental income, total (94)    
Minimum lease payments net of sublease rental income, 2013 752    
Minimum lease payments net of sublease rental income, 2014 642    
Minimum lease payments net of sublease rental income, 2015 499    
Minimum lease payments net of sublease rental income, 2016 342    
Minimum lease payments net of sublease rental income, 2017 214    
Minimum lease payments net of sublease rental income, thereafter 793    
Minimum lease payments net of sublease rental income, total 3,242    
Capital lease commitments      
Capital lease commitments, 2013 59    
Capital lease commitments, 2014 240    
Capital lease commitments, 2015 11    
Capital lease commitments, 2016 7    
Capital lease commitments, 2017 4    
Capital lease commitments, thereafter 33    
Capital lease commitments, total 354    
Less: Interest payments, 2013 (8)    
Less: Interest payments, 2014 (6)    
Less: Interest payments, 2015 (3)    
Less: Interest payments, 2016 (2)    
Less: Interest payments, 2017 (2)    
Less Interest payments, thereafter (12)    
Interest payments, total (33)    
Capital lease commitments, net of interest payment, 2013 51    
Capital lease commitments, net of interest payment, 2014 234    
Capital lease commitments, net of interest payment, 2015 8    
Capital lease commitments, net of interest payment, 2016 5    
Capital lease commitments, net of interest payment, 2017 2    
Capital lease commitments, net of interest payment, thereafter 21    
Capital lease commitments, net of interest payment, total 321    
Unconditional purchase obligations details      
Unconditional purchase obligations, 2013 1,131    
Unconditional purchase obligations, 2014 230    
Unconditional purchase obligations, 2015 218    
Unconditional purchase obligations, 2016 53    
Unconditional purchase obligations, total $ 1,632