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Borrowings (Details) (USD $)
Apr. 30, 2011
Oct. 31, 2010
Apr. 30, 2011
Current portion of long-term debt
Oct. 31, 2010
Current portion of long-term debt
Apr. 30, 2011
Commercial paper
Oct. 31, 2010
Commercial paper
May 31, 2008
Commercial paper
Apr. 30, 2011
Obligation related to notes payable to banks, lines of credit, uncommitted line of credit and other debt
Oct. 31, 2010
Obligation related to notes payable to banks, lines of credit, uncommitted line of credit and other debt
Apr. 30, 2011
Credit facility expiring May 2012
Feb. 28, 2010
Credit facility expired February 2011
Feb. 28, 2011
Credit facility expiring February 2015
Notes Payable and Short-Term Borrowings                        
Amount outstanding $ 8,406,000,000 $ 7,046,000,000 $ 4,502,000,000 $ 2,216,000,000 $ 3,405,000,000 $ 4,432,000,000   $ 499,000,000 $ 398,000,000      
Weighted average interest rate (as a percent)     2.10% 2.20% 0.30% 0.30%   2.90% 1.50%      
Deposits associated with banking activities               388,000,000 348,000,000      
U.S. commercial paper authorization increase             10,000,000,000          
U.S. commercial paper authorization             16,000,000,000          
Subsidiaries' commercial paper authorization             1,000,000,000          
Subsidiaries' commercial paper authorization, available for Hewlett-Packard International Bank PLC             500,000,000          
Amount available under credit facility 7,500,000,000                 3,000,000,000 3,500,000,000 4,500,000,000
Available borrowing resources, other than 2009 Shelf Registration $ 14,400,000,000       $ 13,000,000,000     $ 1,400,000,000