Financial Instruments (Details 3) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jul. 31, 2011	Oct. 31, 2010
Fair value hedges
Interest rate contracts, gross notional amount, fair value hedges	$ 10,075	$ 8,575
Cash flow hedges
Maturity period of foreign currency cash flow hedges, low end of range (in months)	6
Maturity period of foreign currency cash flow hedges, high end of range (in months)	12
Maximum maturity period for lease-related cash flow hedges (in years)	5
Foreign exchange contracts, gross notional amount, cash flow hedges	16,327	16,862
Net investment hedges
Foreign exchange contracts, gross notional amount, net investment hedges	1,523	1,466
Total derivatives designated as hedging instruments, gross notional amount	27,925	26,903
Derivatives not designated as hedging instruments
Foreign exchange contracts, gross notional amount, not designated as hedging instruments	10,563	13,701
Interest rate contracts, gross notional amount, not designated as hedging instruments	2,200	2,200
Other derivatives, gross notional amount, not designated as hedging instruments	445	397
Total derivatives not designated as hedging instruments, gross notional amount	13,208	16,298
Total derivatives, gross notional amount	41,133	43,201
Other Current Assets
Fair value hedges
Interest rate contracts, assets, fair value hedges	41
Cash flow hedges
Foreign exchange contracts, assets, cash flow hedges	80	98
Net investment hedges
Foreign exchange contracts, assets, net investment hedges		8
Total derivatives designated as hedging instruments, assets	121	106
Derivatives not designated as hedging instruments
Foreign exchange contracts, assets, not designated as hedging instruments	38	51
Other derivatives, assets, not designated as hedging instruments	2	5
Total derivatives not designated as hedging instruments, assets	40	56
Total derivatives, assets	161	162
Long-term Financing Receivables and Other Assets
Fair value hedges
Interest rate contracts, assets, fair value hedges	481	656
Cash flow hedges
Foreign exchange contracts, assets, cash flow hedges	4	20
Net investment hedges
Foreign exchange contracts, assets, net investment hedges		2
Total derivatives designated as hedging instruments, assets	485	678
Derivatives not designated as hedging instruments
Foreign exchange contracts, assets, not designated as hedging instruments	5	3
Interest rate contracts, assets, not designated as hedging instruments	59	79
Other derivatives, assets, not designated as hedging instruments	5	6
Total derivatives not designated as hedging instruments, assets	69	88
Total derivatives, assets	554	766
Other Accrued Liabilities
Cash flow hedges
Foreign exchange contracts, liabilities, cash flow hedges	485	503
Net investment hedges
Foreign exchange contracts, liabilities, net investment hedges	78	58
Total derivatives designated as hedging instruments, liabilities	563	561
Derivatives not designated as hedging instruments
Foreign exchange contracts, liabilities, not designated as hedging instruments	167	129
Other derivatives, liabilities, not designated as hedging instruments	9
Total derivatives not designated as hedging instruments, liabilities	176	129
Total derivatives, liabilities	739	690
Other Liabilities
Cash flow hedges
Foreign exchange contracts, liabilities, cash flow hedges	169	83
Net investment hedges
Foreign exchange contracts, liabilities, net investment hedges	86	62
Total derivatives designated as hedging instruments, liabilities	255	145
Derivatives not designated as hedging instruments
Foreign exchange contracts, liabilities, not designated as hedging instruments	45	55
Interest rate contracts, liabilities, not designated as hedging instruments	67	89
Total derivatives not designated as hedging instruments, liabilities	112	144
Total derivatives, liabilities	$ 367	$ 289