Fair Value (Details) (USD $)	9 Months Ended
	Jul. 31, 2014	Oct. 31, 2013
Financial assets and liabilities measured at fair value on a recurring basis
Transfers between levels within the fair value hierarchy	$ 0
Fair Value and Carrying Value of Debt
Fair value, short- and long-term debt	20,300,000,000	22,700,000,000
Carrying value, short- and long-term debt	19,800,000,000	22,600,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 1
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	8,754,000,000	6,838,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 1 | Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	8,731,000,000	6,819,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 1 | Marketable equity securities
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	14,000,000	10,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 1 | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	9,000,000	9,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	3,789,000,000	3,377,000,000
Total liabilities, measured at fair value on a recurring basis	460,000,000	654,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Time deposits
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	2,645,000,000	2,221,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Mutual funds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	305,000,000	313,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Marketable equity securities
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	4,000,000	5,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	386,000,000	387,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Other Debt Securities
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	2,000,000	2,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Interest rate contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	91,000,000	156,000,000
Total liabilities, measured at fair value on a recurring basis	105,000,000	107,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Foreign exchange contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	354,000,000	284,000,000
Total liabilities, measured at fair value on a recurring basis	348,000,000	547,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Other derivatives
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	2,000,000	9,000,000
Total liabilities, measured at fair value on a recurring basis	7,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 3
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	47,000,000	50,000,000
Total liabilities, measured at fair value on a recurring basis	4,000,000	2,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 3 | Other Debt Securities
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	47,000,000	47,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 3 | Foreign exchange contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis		3,000,000
Total liabilities, measured at fair value on a recurring basis	4,000,000	2,000,000
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	12,590,000,000	10,265,000,000
Total liabilities, measured at fair value on a recurring basis	464,000,000	656,000,000
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure | Time deposits
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	2,645,000,000	2,221,000,000
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure | Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	8,731,000,000	6,819,000,000
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure | Mutual funds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	305,000,000	313,000,000
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure | Marketable equity securities
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	18,000,000	15,000,000
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	395,000,000	396,000,000
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure | Other Debt Securities
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	49,000,000	49,000,000
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure | Interest rate contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	91,000,000	156,000,000
Total liabilities, measured at fair value on a recurring basis	105,000,000	107,000,000
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure | Foreign exchange contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	354,000,000	287,000,000
Total liabilities, measured at fair value on a recurring basis	352,000,000	549,000,000
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure | Other derivatives
Financial assets and liabilities measured at fair value on a recurring basis
Total assets, measured at fair value on a recurring basis	2,000,000	9,000,000
Total liabilities, measured at fair value on a recurring basis	$ 7,000,000