Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Financial assets and liabilities measured at fair value on a recurring basis
Transfers between the levels within the fair value hierarchy	$ 0	$ 0
Fair Value and Carrying Value of Debt
Fair value, short- and long-term debt	24,700	19,900
Carrying value, short- and long-term debt	24,700	19,500
Impairment of data center assets	136
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	14,261	14,388
Total Liabilities, measured at fair value on a recurring basis	496	405
Fair Value, Measurements, Recurring | Time deposits | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	3,584	2,865
Fair Value, Measurements, Recurring | Money market funds | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	8,895	9,857
Fair Value, Measurements, Recurring | Mutual funds | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	246	244
Fair Value, Measurements, Recurring | Marketable equity securities | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	62	19
Fair Value, Measurements, Recurring | Foreign bonds | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	355	376
Fair Value, Measurements, Recurring | Other debt securities | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	42	47
Fair Value, Measurements, Recurring | Interest rate contracts | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	38	105
Total Liabilities, measured at fair value on a recurring basis	55	55
Fair Value, Measurements, Recurring | Foreign exchange contracts | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	1,031	868
Total Liabilities, measured at fair value on a recurring basis	441	350
Fair Value, Measurements, Recurring | Other derivatives | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	8	7
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	8,955	9,880
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	8,895	9,857
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	52	14
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	9
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	5,264	4,456
Total Liabilities, measured at fair value on a recurring basis	494	403
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	3,584	2,865
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	246	244
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	10	5
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	347	367
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	1
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	38	105
Total Liabilities, measured at fair value on a recurring basis	55	55
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	1,029	862
Total Liabilities, measured at fair value on a recurring basis	439	348
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	8	7
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	42	52
Total Liabilities, measured at fair value on a recurring basis	2	2
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	40	46
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	2	6
Total Liabilities, measured at fair value on a recurring basis	$ 2	$ 2