Financial Instruments (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 31, 2012	Oct. 31, 2011
Derivative disclosures
Cash posted as collateral to counterparties	$ 23
Number of business days in which the funds held as collateral and posted as collateral, from/to counterparties are transferred	2 days
Cash held as collateral from counterparties	240
Total derivatives, gross notional amount	51,579	49,901
Other Current Assets
Derivative disclosures
Derivative asset, fair value	533	320
Long-term Financing Receivables and Other Assets
Derivative disclosures
Derivative asset, fair value	658	608
Other Accrued Liabilities
Derivative disclosures
Derivative liability, fair value	424	612
Other Liabilities
Derivative disclosures
Derivative liability, fair value	202	292
Cash flow hedges
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
Derivatives designated as hedging instruments
Derivative disclosures
Total derivatives, gross notional amount	32,423	33,297
Derivatives designated as hedging instruments | Other Current Assets
Derivative disclosures
Derivative asset, fair value	457	229
Derivatives designated as hedging instruments | Long-term Financing Receivables and Other Assets
Derivative disclosures
Derivative asset, fair value	597	542
Derivatives designated as hedging instruments | Other Accrued Liabilities
Derivative disclosures
Derivative liability, fair value	259	368
Derivatives designated as hedging instruments | Other Liabilities
Derivative disclosures
Derivative liability, fair value	124	182
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts
Derivative disclosures
Total derivatives, gross notional amount	10,075	10,075
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Other Current Assets
Derivative disclosures
Derivative asset, fair value	11	30
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Long-term Financing Receivables and Other Assets
Derivative disclosures
Derivative asset, fair value	530	508
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts
Derivative disclosures
Total derivatives, gross notional amount	20,706	21,666
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Current Assets
Derivative disclosures
Derivative asset, fair value	435	192
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Long-term Financing Receivables and Other Assets
Derivative disclosures
Derivative asset, fair value	56	30
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Accrued Liabilities
Derivative disclosures
Derivative liability, fair value	210	324
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Liabilities
Derivative disclosures
Derivative liability, fair value	88	126
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts
Derivative disclosures
Total derivatives, gross notional amount	1,642	1,556
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Current Assets
Derivative disclosures
Derivative asset, fair value	11	7
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Long-term Financing Receivables and Other Assets
Derivative disclosures
Derivative asset, fair value	11	4
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Accrued Liabilities
Derivative disclosures
Derivative liability, fair value	49	44
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Liabilities
Derivative disclosures
Derivative liability, fair value	36	56
Derivatives not designated as hedging instruments
Derivative disclosures
Total derivatives, gross notional amount	19,156	16,604
Derivatives not designated as hedging instruments | Other Current Assets
Derivative disclosures
Derivative asset, fair value	76	91
Derivatives not designated as hedging instruments | Long-term Financing Receivables and Other Assets
Derivative disclosures
Derivative asset, fair value	61	66
Derivatives not designated as hedging instruments | Other Accrued Liabilities
Derivative disclosures
Derivative liability, fair value	165	244
Derivatives not designated as hedging instruments | Other Liabilities
Derivative disclosures
Derivative liability, fair value	78	110
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative disclosures
Total derivatives, gross notional amount	16,572	13,994
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Current Assets
Derivative disclosures
Derivative asset, fair value	64	66
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-term Financing Receivables and Other Assets
Derivative disclosures
Derivative asset, fair value	5	5
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Accrued Liabilities
Derivative disclosures
Derivative liability, fair value	165	244
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Liabilities
Derivative disclosures
Derivative liability, fair value	23	38
Derivatives not designated as hedging instruments | Interest rate contracts
Derivative disclosures
Total derivatives, gross notional amount	2,200	2,200
Derivatives not designated as hedging instruments | Interest rate contracts | Long-term Financing Receivables and Other Assets
Derivative disclosures
Derivative asset, fair value	48	55
Derivatives not designated as hedging instruments | Interest rate contracts | Other Liabilities
Derivative disclosures
Derivative liability, fair value	55	71
Derivatives not designated as hedging instruments | Other derivatives
Derivative disclosures
Total derivatives, gross notional amount	384	410
Derivatives not designated as hedging instruments | Other derivatives | Other Current Assets
Derivative disclosures
Derivative asset, fair value	12	25
Derivatives not designated as hedging instruments | Other derivatives | Long-term Financing Receivables and Other Assets
Derivative disclosures
Derivative asset, fair value	8	6
Derivatives not designated as hedging instruments | Other derivatives | Other Liabilities
Derivative disclosures
Derivative liability, fair value		$ 1