Financial Instruments (Details 3) (USD $) In Millions, unless otherwise specified											12 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011 Other Current Assets	Oct. 31, 2010 Other Current Assets	Oct. 31, 2011 Long-term Financing Receivables and Other Assets	Oct. 31, 2010 Long-term Financing Receivables and Other Assets	Oct. 31, 2011 Other Accrued Liabilities	Oct. 31, 2010 Other Accrued Liabilities	Oct. 31, 2011 Other Liabilities	Oct. 31, 2010 Other Liabilities	Oct. 31, 2011 Cash flow hedges Year M	Oct. 31, 2011 Derivatives designated as hedging instruments	Oct. 31, 2010 Derivatives designated as hedging instruments	Oct. 31, 2011 Derivatives designated as hedging instruments Other Current Assets	Oct. 31, 2010 Derivatives designated as hedging instruments Other Current Assets	Oct. 31, 2011 Derivatives designated as hedging instruments Long-term Financing Receivables and Other Assets	Oct. 31, 2010 Derivatives designated as hedging instruments Long-term Financing Receivables and Other Assets	Oct. 31, 2011 Derivatives designated as hedging instruments Other Accrued Liabilities	Oct. 31, 2010 Derivatives designated as hedging instruments Other Accrued Liabilities	Oct. 31, 2011 Derivatives designated as hedging instruments Other Liabilities	Oct. 31, 2010 Derivatives designated as hedging instruments Other Liabilities	Oct. 31, 2011 Derivatives designated as hedging instruments Fair value hedges Interest rate contracts	Oct. 31, 2010 Derivatives designated as hedging instruments Fair value hedges Interest rate contracts	Oct. 31, 2011 Derivatives designated as hedging instruments Fair value hedges Interest rate contracts Other Current Assets	Oct. 31, 2011 Derivatives designated as hedging instruments Fair value hedges Interest rate contracts Long-term Financing Receivables and Other Assets	Oct. 31, 2010 Derivatives designated as hedging instruments Fair value hedges Interest rate contracts Long-term Financing Receivables and Other Assets	Oct. 31, 2011 Derivatives designated as hedging instruments Cash flow hedges Foreign exchange contracts	Oct. 31, 2010 Derivatives designated as hedging instruments Cash flow hedges Foreign exchange contracts	Oct. 31, 2011 Derivatives designated as hedging instruments Cash flow hedges Foreign exchange contracts Other Current Assets	Oct. 31, 2010 Derivatives designated as hedging instruments Cash flow hedges Foreign exchange contracts Other Current Assets	Oct. 31, 2011 Derivatives designated as hedging instruments Cash flow hedges Foreign exchange contracts Long-term Financing Receivables and Other Assets	Oct. 31, 2010 Derivatives designated as hedging instruments Cash flow hedges Foreign exchange contracts Long-term Financing Receivables and Other Assets	Oct. 31, 2011 Derivatives designated as hedging instruments Cash flow hedges Foreign exchange contracts Other Accrued Liabilities	Oct. 31, 2010 Derivatives designated as hedging instruments Cash flow hedges Foreign exchange contracts Other Accrued Liabilities	Oct. 31, 2011 Derivatives designated as hedging instruments Cash flow hedges Foreign exchange contracts Other Liabilities	Oct. 31, 2010 Derivatives designated as hedging instruments Cash flow hedges Foreign exchange contracts Other Liabilities	Oct. 31, 2011 Derivatives designated as hedging instruments Net investment hedges Foreign exchange contracts	Oct. 31, 2010 Derivatives designated as hedging instruments Net investment hedges Foreign exchange contracts	Oct. 31, 2011 Derivatives designated as hedging instruments Net investment hedges Foreign exchange contracts Other Current Assets	Oct. 31, 2010 Derivatives designated as hedging instruments Net investment hedges Foreign exchange contracts Other Current Assets	Oct. 31, 2011 Derivatives designated as hedging instruments Net investment hedges Foreign exchange contracts Long-term Financing Receivables and Other Assets	Oct. 31, 2010 Derivatives designated as hedging instruments Net investment hedges Foreign exchange contracts Long-term Financing Receivables and Other Assets	Oct. 31, 2011 Derivatives designated as hedging instruments Net investment hedges Foreign exchange contracts Other Accrued Liabilities	Oct. 31, 2010 Derivatives designated as hedging instruments Net investment hedges Foreign exchange contracts Other Accrued Liabilities	Oct. 31, 2011 Derivatives designated as hedging instruments Net investment hedges Foreign exchange contracts Other Liabilities	Oct. 31, 2010 Derivatives designated as hedging instruments Net investment hedges Foreign exchange contracts Other Liabilities	Oct. 31, 2011 Derivatives not designated as hedging instruments	Oct. 31, 2010 Derivatives not designated as hedging instruments	Oct. 31, 2011 Derivatives not designated as hedging instruments Other Current Assets	Oct. 31, 2010 Derivatives not designated as hedging instruments Other Current Assets	Oct. 31, 2011 Derivatives not designated as hedging instruments Long-term Financing Receivables and Other Assets	Oct. 31, 2010 Derivatives not designated as hedging instruments Long-term Financing Receivables and Other Assets	Oct. 31, 2011 Derivatives not designated as hedging instruments Other Accrued Liabilities	Oct. 31, 2010 Derivatives not designated as hedging instruments Other Accrued Liabilities	Oct. 31, 2011 Derivatives not designated as hedging instruments Other Liabilities	Oct. 31, 2010 Derivatives not designated as hedging instruments Other Liabilities	Oct. 31, 2011 Derivatives not designated as hedging instruments Foreign exchange contracts	Oct. 31, 2010 Derivatives not designated as hedging instruments Foreign exchange contracts	Oct. 31, 2011 Derivatives not designated as hedging instruments Foreign exchange contracts Other Current Assets	Oct. 31, 2010 Derivatives not designated as hedging instruments Foreign exchange contracts Other Current Assets	Oct. 31, 2011 Derivatives not designated as hedging instruments Foreign exchange contracts Long-term Financing Receivables and Other Assets	Oct. 31, 2010 Derivatives not designated as hedging instruments Foreign exchange contracts Long-term Financing Receivables and Other Assets	Oct. 31, 2011 Derivatives not designated as hedging instruments Foreign exchange contracts Other Accrued Liabilities	Oct. 31, 2010 Derivatives not designated as hedging instruments Foreign exchange contracts Other Accrued Liabilities	Oct. 31, 2011 Derivatives not designated as hedging instruments Foreign exchange contracts Other Liabilities	Oct. 31, 2010 Derivatives not designated as hedging instruments Foreign exchange contracts Other Liabilities	Oct. 31, 2011 Derivatives not designated as hedging instruments Interest rate contracts	Oct. 31, 2010 Derivatives not designated as hedging instruments Interest rate contracts	Oct. 31, 2011 Derivatives not designated as hedging instruments Interest rate contracts Long-term Financing Receivables and Other Assets	Oct. 31, 2010 Derivatives not designated as hedging instruments Interest rate contracts Long-term Financing Receivables and Other Assets	Oct. 31, 2011 Derivatives not designated as hedging instruments Interest rate contracts Other Liabilities	Oct. 31, 2010 Derivatives not designated as hedging instruments Interest rate contracts Other Liabilities	Oct. 31, 2011 Derivatives not designated as hedging instruments Other derivatives	Oct. 31, 2010 Derivatives not designated as hedging instruments Other derivatives	Oct. 31, 2011 Derivatives not designated as hedging instruments Other derivatives Other Current Assets	Oct. 31, 2010 Derivatives not designated as hedging instruments Other derivatives Other Current Assets	Oct. 31, 2011 Derivatives not designated as hedging instruments Other derivatives Long-term Financing Receivables and Other Assets	Oct. 31, 2010 Derivatives not designated as hedging instruments Other derivatives Long-term Financing Receivables and Other Assets	Oct. 31, 2011 Derivatives not designated as hedging instruments Other derivatives Other Liabilities
Cash flow hedges
Maturity period of foreign currency cash flow hedges (in months)											12
Maximum maturity period for lease-related cash flow hedges (in years)											5
Derivative disclosures
Cash posted as collateral to counterparties	$ 96
Deposited restricted cash by counterparties, aggregate fair value		45
Total derivatives, gross notional amount	49,901	43,201										33,297	26,903									10,075	8,575				21,666	16,862									1,556	1,466									16,604	16,298									13,994	13,701									2,200	2,200					410	397
Derivative asset, fair value			320	162	608	766								229	106	542	678							30	508	656			192	98	30	20							7	8	4	2							91	56	66	88							66	51	5	3							55	79					25	5	6	6
Derivative liability, fair value							612	690	292	289								368	561	182	145												324	503	126	83							44	58	56	62							244	129	110	144							244	129	38	55					71	89							1
Collateralized arrangements in liability position	$ 115