Fair Value (Details) (USD $)	Apr. 30, 2015	Oct. 31, 2014
Fair Value and Carrying Value of Debt
Fair value, short- and long-term debt	$ 21,500,000,000	$ 19,900,000,000
Carrying value, short- and long-term debt	21,100,000,000	19,500,000,000
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	8,388,000,000	9,880,000,000
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	8,326,000,000	9,857,000,000
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	54,000,000	14,000,000
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	8,000,000	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	5,437,000,000	4,456,000,000
Total Liabilities, measured at fair value on a recurring basis	693,000,000	403,000,000
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	3,464,000,000	2,865,000,000
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	252,000,000	244,000,000
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	8,000,000	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	331,000,000	367,000,000
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	1,000,000
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	111,000,000	105,000,000
Total Liabilities, measured at fair value on a recurring basis		55,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Foreign currency contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	1,265,000,000	862,000,000
Total Liabilities, measured at fair value on a recurring basis	692,000,000	348,000,000
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	4,000,000	7,000,000
Total Liabilities, measured at fair value on a recurring basis	1,000,000
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	55,000,000	52,000,000
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	42,000,000	46,000,000
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 3 | Foreign currency contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	13,000,000	6,000,000
Total Liabilities, measured at fair value on a recurring basis	4,000,000	2,000,000
Fair Value, Measurements, Recurring | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	13,880,000,000	14,388,000,000
Total Liabilities, measured at fair value on a recurring basis	697,000,000	405,000,000
Transfer of marketable equity securities from Level 2 to Level 1	41,000,000
Fair Value, Measurements, Recurring | Fair Value | Time deposits
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	3,464,000,000	2,865,000,000
Fair Value, Measurements, Recurring | Fair Value | 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	8,326,000,000	9,857,000,000
Fair Value, Measurements, Recurring | Fair Value | Mutual funds
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	252,000,000	244,000,000
Fair Value, Measurements, Recurring | Fair Value | 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	62,000,000	19,000,000
Fair Value, Measurements, Recurring | Fair Value | Foreign bonds.
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	339,000,000	376,000,000
Fair Value, Measurements, Recurring | Fair Value | 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	44,000,000	47,000,000
Fair Value, Measurements, Recurring | Fair Value | 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	111,000,000	105,000,000
Total Liabilities, measured at fair value on a recurring basis		55,000,000
Fair Value, Measurements, Recurring | Fair Value | Foreign currency contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	1,278,000,000	868,000,000
Total Liabilities, measured at fair value on a recurring basis	696,000,000	350,000,000
Fair Value, Measurements, Recurring | Fair Value | Other derivatives
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	7,000,000
Total Liabilities, measured at fair value on a recurring basis	$ 1,000,000